notebooks/0-concepts/units-data-array.ipynb

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   "source": [
    "# UnitsDataArray\n",
    "\n",
    "*Author: Creare* <br>\n",
    "*Date: April 01 2020* <br>\n",
    "\n",
    "**Keywords**: podpac, UnitsDataArray"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Overview\n",
    "\n",
    "Reference tutorial for the `podpac.UnitsDataArray` class."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Prerequisites\n",
    "\n",
    "- Python 2.7 or above\n",
    "- [`podpac`](https://podpac.org/install.html#install)\n",
    "- *Review the [README.md](../../README.md) and [jupyter-tutorial.ipynb](../jupyter-tutorial.ipynb) for additional info on using jupyter notebooks*"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### See Also\n",
    "\n",
    "- [introduction.ipynb](introduction.ipynb): PODPAC introduction\n",
    "- `podpac.UnitsDataArray` API Reference - In Development\n",
    "- [xarray](xarray.ipynb): Short reference for the core [`xarray`](https://xarray.pydata.org/en/stable/) module."
   ]
  },
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Background"
   ]
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   "source": [
    "This example shows how to use the UnitsDataArray object:\n",
    "\n",
    "* `UnitsDataArray` is the main ouput container for evaluated nodes in PODPAC.\n",
    "* UnitsDataArray is a thin wrapper around [xarray DataArray](http://xarray.pydata.org/en/stable/generated/xarray.DataArray.html)\n",
    "\n",
    "\n",
    "1. The first section shows the basic usage, which is similar to `xarray.DataArray`\n",
    "2. The second section shows the added functionality which includes units"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Basic Functionality"
   ]
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       "</style><div class='xr-wrap'><div class='xr-header'><div class='xr-obj-type'>xarray.UnitsDataArray</div><div class='xr-array-name'></div><ul class='xr-dim-list'><li><span class='xr-has-index'>lat</span>: 5</li><li><span class='xr-has-index'>lon</span>: 5</li></ul></div><ul class='xr-sections'><li class='xr-section-item'><div class='xr-array-wrap'><input id='section-0106efd7-1e3f-420b-8b3e-dd17058ecba7' class='xr-array-in' type='checkbox' ><label for='section-0106efd7-1e3f-420b-8b3e-dd17058ecba7' title='Show/hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-array-preview xr-preview'><span>0.6577 0.746 0.01687 0.359 0.6495 ... 0.6657 0.663 0.923 0.2263 0.9427</span></div><pre class='xr-array-data'>array([[0.65767119, 0.74604697, 0.01686921, 0.35898519, 0.64950088],\n",
       "       [0.10088049, 0.79192283, 0.51701379, 0.17678585, 0.41894845],\n",
       "       [0.2060476 , 0.4850058 , 0.42082283, 0.03094578, 0.90920221],\n",
       "       [0.72833138, 0.99708254, 0.35952255, 0.36697822, 0.46559663],\n",
       "       [0.66571027, 0.66297499, 0.92295894, 0.22634579, 0.942726  ]])</pre></div></li><li class='xr-section-item'><input id='section-500aabc1-41fc-421d-b498-2b92a15c7103' class='xr-section-summary-in' type='checkbox'  checked><label for='section-500aabc1-41fc-421d-b498-2b92a15c7103' class='xr-section-summary' >Coordinates: <span>(2)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>lat</span></div><div class='xr-var-dims'>(lat)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>-10.0 -5.0 0.0 5.0 10.0</div><input id='attrs-51fa1fea-85da-4c08-9c9c-546392153407' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-51fa1fea-85da-4c08-9c9c-546392153407' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-c5ecd05b-341d-4410-9c1d-23672fb72238' class='xr-var-data-in' type='checkbox'><label for='data-c5ecd05b-341d-4410-9c1d-23672fb72238' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><pre class='xr-var-data'>array([-10.,  -5.,   0.,   5.,  10.])</pre></li><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>lon</span></div><div class='xr-var-dims'>(lon)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>-10.0 -5.0 0.0 5.0 10.0</div><input id='attrs-c41e71d4-77f6-4dd9-955a-ac2c28dc8a19' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-c41e71d4-77f6-4dd9-955a-ac2c28dc8a19' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-cd272293-5501-4185-a516-70c2c0d23bb3' class='xr-var-data-in' type='checkbox'><label for='data-cd272293-5501-4185-a516-70c2c0d23bb3' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><pre class='xr-var-data'>array([-10.,  -5.,   0.,   5.,  10.])</pre></li></ul></div></li><li class='xr-section-item'><input id='section-ceae016b-accb-4f75-a750-4c6410cfb16f' class='xr-section-summary-in' type='checkbox'  checked><label for='section-ceae016b-accb-4f75-a750-4c6410cfb16f' class='xr-section-summary' >Attributes: <span>(3)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'><dt><span>layer_style :</span></dt><dd>&lt;podpac.core.style.Style object at 0x000001F606CD6448&gt;</dd><dt><span>crs :</span></dt><dd>EPSG:4326</dd><dt><span>geotransform :</span></dt><dd>(-12.5, 5.0, 0.0, -12.5, 0.0, 5.0)</dd></dl></div></li></ul></div></div>"
      ],
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       "<xarray.UnitsDataArray (lat: 5, lon: 5)>\n",
       "array([[0.65767119, 0.74604697, 0.01686921, 0.35898519, 0.64950088],\n",
       "       [0.10088049, 0.79192283, 0.51701379, 0.17678585, 0.41894845],\n",
       "       [0.2060476 , 0.4850058 , 0.42082283, 0.03094578, 0.90920221],\n",
       "       [0.72833138, 0.99708254, 0.35952255, 0.36697822, 0.46559663],\n",
       "       [0.66571027, 0.66297499, 0.92295894, 0.22634579, 0.942726  ]])\n",
       "Coordinates:\n",
       "  * lat      (lat) float64 -10.0 -5.0 0.0 5.0 10.0\n",
       "  * lon      (lon) float64 -10.0 -5.0 0.0 5.0 10.0\n",
       "Attributes:\n",
       "    layer_style:   <podpac.core.style.Style object at 0x000001F606CD6448>\n",
       "    crs:           EPSG:4326\n",
       "    geotransform:  (-12.5, 5.0, 0.0, -12.5, 0.0, 5.0)"
      ]
     },
     "execution_count": 1,
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    }
   ],
   "source": [
    "import podpac\n",
    "import numpy as np\n",
    "\n",
    "# create an empty node\n",
    "node = podpac.Node()\n",
    "\n",
    "# create randome 5 x 5 matrix of data\n",
    "data = np.random.rand(5, 5)\n",
    "\n",
    "# create mock Coordinates describing the location of each data point\n",
    "coords = podpac.Coordinates([np.linspace(-10, 10, 5), np.linspace(-10, 10, 5)], ['lat', 'lon'])\n",
    "\n",
    "# Use the convience method `Node.create_output_array` to create a `UnitsDataArray`\n",
    "units_data_array = node.create_output_array(coords, data=data)\n",
    "\n",
    "units_data_array"
   ]
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       "array([[0.65767119, 0.74604697, 0.01686921, 0.35898519, 0.64950088],\n",
       "       [0.10088049, 0.79192283, 0.51701379, 0.17678585, 0.41894845],\n",
       "       [0.2060476 , 0.4850058 , 0.42082283, 0.03094578, 0.90920221],\n",
       "       [0.72833138, 0.99708254, 0.35952255, 0.36697822, 0.46559663],\n",
       "       [0.66571027, 0.66297499, 0.92295894, 0.22634579, 0.942726  ]])"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# get data values\n",
    "units_data_array.values\n",
    "\n",
    "# or equivalently\n",
    "units_data_array.data"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "data": {
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       "</style><div class='xr-wrap'><div class='xr-header'><div class='xr-obj-type'>xarray.UnitsDataArray</div><div class='xr-array-name'></div><ul class='xr-dim-list'><li><span class='xr-has-index'>lon</span>: 5</li></ul></div><ul class='xr-sections'><li class='xr-section-item'><div class='xr-array-wrap'><input id='section-8213db3a-2104-4271-b16c-1feae8c051ff' class='xr-array-in' type='checkbox' ><label for='section-8213db3a-2104-4271-b16c-1feae8c051ff' title='Show/hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-array-preview xr-preview'><span>0.6577 0.746 0.01687 0.359 0.6495</span></div><pre class='xr-array-data'>array([0.65767119, 0.74604697, 0.01686921, 0.35898519, 0.64950088])</pre></div></li><li class='xr-section-item'><input id='section-0cb93ed8-bb07-40eb-b781-9d109501ad52' class='xr-section-summary-in' type='checkbox'  checked><label for='section-0cb93ed8-bb07-40eb-b781-9d109501ad52' class='xr-section-summary' >Coordinates: <span>(2)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span>lat</span></div><div class='xr-var-dims'>()</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>-10.0</div><input id='attrs-53031f19-a6c2-4666-abb6-6facf3a8309e' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-53031f19-a6c2-4666-abb6-6facf3a8309e' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-0c823a1e-d3a0-467a-878c-63aeeb0a9d00' class='xr-var-data-in' type='checkbox'><label for='data-0c823a1e-d3a0-467a-878c-63aeeb0a9d00' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><pre class='xr-var-data'>array(-10.)</pre></li><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>lon</span></div><div class='xr-var-dims'>(lon)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>-10.0 -5.0 0.0 5.0 10.0</div><input id='attrs-81ff45bd-6aa4-4f02-a73b-519a657cd7ba' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-81ff45bd-6aa4-4f02-a73b-519a657cd7ba' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-03205809-ecc5-4804-a3fa-f2f0141ae4df' class='xr-var-data-in' type='checkbox'><label for='data-03205809-ecc5-4804-a3fa-f2f0141ae4df' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><pre class='xr-var-data'>array([-10.,  -5.,   0.,   5.,  10.])</pre></li></ul></div></li><li class='xr-section-item'><input id='section-82663b7c-b863-41f7-8ae5-11ba9d3f044b' class='xr-section-summary-in' type='checkbox'  checked><label for='section-82663b7c-b863-41f7-8ae5-11ba9d3f044b' class='xr-section-summary' >Attributes: <span>(3)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'><dt><span>layer_style :</span></dt><dd>&lt;podpac.core.style.Style object at 0x000001F606CD6448&gt;</dd><dt><span>crs :</span></dt><dd>EPSG:4326</dd><dt><span>geotransform :</span></dt><dd>(-12.5, 5.0, 0.0, -12.5, 0.0, 5.0)</dd></dl></div></li></ul></div></div>"
      ],
      "text/plain": [
       "<xarray.UnitsDataArray (lon: 5)>\n",
       "array([0.65767119, 0.74604697, 0.01686921, 0.35898519, 0.64950088])\n",
       "Coordinates:\n",
       "    lat      float64 -10.0\n",
       "  * lon      (lon) float64 -10.0 -5.0 0.0 5.0 10.0\n",
       "Attributes:\n",
       "    layer_style:   <podpac.core.style.Style object at 0x000001F606CD6448>\n",
       "    crs:           EPSG:4326\n",
       "    geotransform:  (-12.5, 5.0, 0.0, -12.5, 0.0, 5.0)"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# get data values by coordinate value\n",
    "units_data_array.loc[-10]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "<class 'xarray.core.coordinates.DataArrayCoordinates'>\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "Coordinates:\n",
       "  * lat      (lat) float64 -10.0 -5.0 0.0 5.0 10.0\n",
       "  * lon      (lon) float64 -10.0 -5.0 0.0 5.0 10.0"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# get xarray coordinates\n",
    "print(type(units_data_array.coords))\n",
    "units_data_array.coords"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
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       "</style><div class='xr-wrap'><div class='xr-header'><div class='xr-obj-type'>xarray.UnitsDataArray</div><div class='xr-array-name'>'lat'</div><ul class='xr-dim-list'><li><span class='xr-has-index'>lat</span>: 5</li></ul></div><ul class='xr-sections'><li class='xr-section-item'><div class='xr-array-wrap'><input id='section-6b9bea6c-ca70-4b26-a0c7-67418e3e4444' class='xr-array-in' type='checkbox' ><label for='section-6b9bea6c-ca70-4b26-a0c7-67418e3e4444' title='Show/hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-array-preview xr-preview'><span>-10.0 -5.0 0.0 5.0 10.0</span></div><pre class='xr-array-data'>array([-10.,  -5.,   0.,   5.,  10.])</pre></div></li><li class='xr-section-item'><input id='section-bcabbe92-9a69-4e9b-be2d-27e15ec5b633' class='xr-section-summary-in' type='checkbox'  checked><label for='section-bcabbe92-9a69-4e9b-be2d-27e15ec5b633' class='xr-section-summary' >Coordinates: <span>(1)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>lat</span></div><div class='xr-var-dims'>(lat)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>-10.0 -5.0 0.0 5.0 10.0</div><input id='attrs-3a739573-e66d-4558-afee-c07c724455d3' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-3a739573-e66d-4558-afee-c07c724455d3' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-c9ef57d2-95a0-4817-b92d-5f9a399c3d2b' class='xr-var-data-in' type='checkbox'><label for='data-c9ef57d2-95a0-4817-b92d-5f9a399c3d2b' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><pre class='xr-var-data'>array([-10.,  -5.,   0.,   5.,  10.])</pre></li></ul></div></li><li class='xr-section-item'><input id='section-c8aa31ff-2e3f-4926-a01a-b6d21d015033' class='xr-section-summary-in' type='checkbox' disabled ><label for='section-c8aa31ff-2e3f-4926-a01a-b6d21d015033' class='xr-section-summary'  title='Expand/collapse section'>Attributes: <span>(0)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'></dl></div></li></ul></div></div>"
      ],
      "text/plain": [
       "<xarray.UnitsDataArray 'lat' (lat: 5)>\n",
       "array([-10.,  -5.,   0.,   5.,  10.])\n",
       "Coordinates:\n",
       "  * lat      (lat) float64 -10.0 -5.0 0.0 5.0 10.0"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# get individual xarray coordinates\n",
    "units_data_array.coords['lat']\n",
    "\n",
    "# or equivalently:\n",
    "# units_data_array['lat']"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([-10.,  -5.,   0.,   5.,  10.])"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# get individual xarray coordinate values\n",
    "units_data_array.coords['lat'].values\n",
    "\n",
    "# or equivalently:\n",
    "# units_data_array.coords['lat'].data\n",
    "# units_data_array['lat'].values\n",
    "# units_data_array['lat'].data"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "('lat', 'lon')"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# get the dimensions of the DataArray\n",
    "units_data_array.dims"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Stacked Coordinates"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
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       "\n",
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       "</style><div class='xr-wrap'><div class='xr-header'><div class='xr-obj-type'>xarray.UnitsDataArray</div><div class='xr-array-name'></div><ul class='xr-dim-list'><li><span class='xr-has-index'>lat_lon</span>: 5</li></ul></div><ul class='xr-sections'><li class='xr-section-item'><div class='xr-array-wrap'><input id='section-d3a06fd1-c2c4-4191-b4ff-6ab510bcff3c' class='xr-array-in' type='checkbox' ><label for='section-d3a06fd1-c2c4-4191-b4ff-6ab510bcff3c' title='Show/hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-array-preview xr-preview'><span>0.6504 0.43 0.01816 0.366 0.8494</span></div><pre class='xr-array-data'>array([0.6504114 , 0.43004264, 0.01816072, 0.36598248, 0.84939495])</pre></div></li><li class='xr-section-item'><input id='section-39fe4d39-6e3d-49ce-82f1-777c4a18daae' class='xr-section-summary-in' type='checkbox'  checked><label for='section-39fe4d39-6e3d-49ce-82f1-777c4a18daae' class='xr-section-summary' >Coordinates: <span>(1)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>lat_lon</span></div><div class='xr-var-dims'>(lat_lon)</div><div class='xr-var-dtype'>MultiIndex</div><div class='xr-var-preview xr-preview'>(lat, lon)</div><input id='attrs-4a5a91a8-256f-4f92-87e0-2765726634c6' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-4a5a91a8-256f-4f92-87e0-2765726634c6' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-4fd4e8ad-c044-430d-8f58-05c7fc72d455' class='xr-var-data-in' type='checkbox'><label for='data-4fd4e8ad-c044-430d-8f58-05c7fc72d455' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><pre class='xr-var-data'>array([(-10.0, -10.0), (-5.0, -5.0), (0.0, 0.0), (5.0, 5.0), (10.0, 10.0)],\n",
       "      dtype=object)</pre></li><li class='xr-var-item'><div class='xr-var-name'><span>lat</span></div><div class='xr-var-dims'>(lat_lon)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>-10.0 -5.0 0.0 5.0 10.0</div><input id='attrs-920d7465-cc70-44fd-994f-1b5862bd807b' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-920d7465-cc70-44fd-994f-1b5862bd807b' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-4e00329f-fbe8-42cb-b736-5e861adf4cc5' class='xr-var-data-in' type='checkbox'><label for='data-4e00329f-fbe8-42cb-b736-5e861adf4cc5' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><pre class='xr-var-data'>array([-10.,  -5.,   0.,   5.,  10.])</pre></li><li class='xr-var-item'><div class='xr-var-name'><span>lon</span></div><div class='xr-var-dims'>(lat_lon)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>-10.0 -5.0 0.0 5.0 10.0</div><input id='attrs-7d5675b5-46d0-4783-9e55-254868119f26' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-7d5675b5-46d0-4783-9e55-254868119f26' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-bebc4371-c8ae-4d9e-afc6-fb881f959fbd' class='xr-var-data-in' type='checkbox'><label for='data-bebc4371-c8ae-4d9e-afc6-fb881f959fbd' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><pre class='xr-var-data'>array([-10.,  -5.,   0.,   5.,  10.])</pre></li></ul></div></li><li class='xr-section-item'><input id='section-a060948c-f4ea-40d2-903e-3eeaba36fe3a' class='xr-section-summary-in' type='checkbox'  checked><label for='section-a060948c-f4ea-40d2-903e-3eeaba36fe3a' class='xr-section-summary' >Attributes: <span>(2)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'><dt><span>layer_style :</span></dt><dd>&lt;podpac.core.style.Style object at 0x000001F606CD63C8&gt;</dd><dt><span>crs :</span></dt><dd>EPSG:4326</dd></dl></div></li></ul></div></div>"
      ],
      "text/plain": [
       "<xarray.UnitsDataArray (lat_lon: 5)>\n",
       "array([0.6504114 , 0.43004264, 0.01816072, 0.36598248, 0.84939495])\n",
       "Coordinates:\n",
       "  * lat_lon  (lat_lon) MultiIndex\n",
       "  - lat      (lat_lon) float64 -10.0 -5.0 0.0 5.0 10.0\n",
       "  - lon      (lat_lon) float64 -10.0 -5.0 0.0 5.0 10.0\n",
       "Attributes:\n",
       "    layer_style:  <podpac.core.style.Style object at 0x000001F606CD63C8>\n",
       "    crs:          EPSG:4326"
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# create an empty note, then use the convience method `create_output_array` to create\n",
    "# an output array with data at specific Coordinates\n",
    "node = podpac.Node()\n",
    "data = np.random.rand(5)\n",
    "coords = podpac.Coordinates([(np.linspace(-10, 10, 5), np.linspace(-10, 10, 5))], ['lat_lon'])\n",
    "\n",
    "units_data_array = node.create_output_array(coords, data=data)\n",
    "\n",
    "units_data_array"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "<class 'xarray.core.coordinates.DataArrayCoordinates'>\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "Coordinates:\n",
       "  * lat_lon  (lat_lon) MultiIndex\n",
       "  - lat      (lat_lon) float64 -10.0 -5.0 0.0 5.0 10.0\n",
       "  - lon      (lat_lon) float64 -10.0 -5.0 0.0 5.0 10.0"
      ]
     },
     "execution_count": 9,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# get xarray coordinates\n",
    "print(type(units_data_array.coords))\n",
    "units_data_array.coords"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "('lat_lon',)"
      ]
     },
     "execution_count": 10,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# get the dimensions of the DataArray\n",
    "units_data_array.dims"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Added Functionality (Units)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Create Nodes to use the convience methods for making units data arrays\n",
    "kgs_node = podpac.Node(units='kg')\n",
    "lbs_node = podpac.Node(units='lbs')\n",
    "data = np.ones(1)\n",
    "coords = podpac.Coordinates([0], ['lat'])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
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       "  width: 15px;\n",
       "  text-align: center;\n",
       "}\n",
       "\n",
       ".xr-section-summary-in:disabled + label:before {\n",
       "  color: var(--xr-disabled-color);\n",
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       "\n",
       ".xr-section-summary-in:checked + label:before {\n",
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       "}\n",
       "\n",
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       "\n",
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       "  padding-top: 4px;\n",
       "  padding-bottom: 4px;\n",
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       "\n",
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       "\n",
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       "  grid-column: 1 / -1;\n",
       "  margin-bottom: 5px;\n",
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       "\n",
       ".xr-section-summary-in:checked ~ .xr-section-details {\n",
       "  display: contents;\n",
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       "\n",
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       "\n",
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       "\n",
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       "\n",
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       "\n",
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       "  padding: 0;\n",
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       "\n",
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       "\n",
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       ".xr-var-list > li:nth-child(odd) > .xr-var-name span {\n",
       "  background-color: var(--xr-background-color-row-odd);\n",
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       "\n",
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       "\n",
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       "\n",
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       "\n",
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       "</style><div class='xr-wrap'><div class='xr-header'><div class='xr-obj-type'>xarray.UnitsDataArray</div><div class='xr-array-name'></div><ul class='xr-dim-list'><li><span class='xr-has-index'>lat</span>: 1</li></ul></div><ul class='xr-sections'><li class='xr-section-item'><div class='xr-array-wrap'><input id='section-24724d92-f732-4ba4-9de8-bf067bb716d7' class='xr-array-in' type='checkbox' ><label for='section-24724d92-f732-4ba4-9de8-bf067bb716d7' title='Show/hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-array-preview xr-preview'><span>1.0</span></div><pre class='xr-array-data'>array([1.])</pre></div></li><li class='xr-section-item'><input id='section-8da12116-b4f6-4a62-9066-7d95c883e571' class='xr-section-summary-in' type='checkbox'  checked><label for='section-8da12116-b4f6-4a62-9066-7d95c883e571' class='xr-section-summary' >Coordinates: <span>(1)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>lat</span></div><div class='xr-var-dims'>(lat)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>0.0</div><input id='attrs-5676d33e-f206-4330-8c5e-c46b392bfa31' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-5676d33e-f206-4330-8c5e-c46b392bfa31' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-486bf6bb-ae54-47ca-a390-99d14b0e1092' class='xr-var-data-in' type='checkbox'><label for='data-486bf6bb-ae54-47ca-a390-99d14b0e1092' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><pre class='xr-var-data'>array([0.])</pre></li></ul></div></li><li class='xr-section-item'><input id='section-2be07115-e456-49f9-9b27-d7b9a91ad061' class='xr-section-summary-in' type='checkbox'  checked><label for='section-2be07115-e456-49f9-9b27-d7b9a91ad061' class='xr-section-summary' >Attributes: <span>(3)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'><dt><span>layer_style :</span></dt><dd>&lt;podpac.core.style.Style object at 0x000001F606D28208&gt;</dd><dt><span>crs :</span></dt><dd>EPSG:4326</dd><dt><span>units :</span></dt><dd>kilogram</dd></dl></div></li></ul></div></div>"
      ],
      "text/plain": [
       "<xarray.UnitsDataArray (lat: 1)>\n",
       "array([1.])\n",
       "Coordinates:\n",
       "  * lat      (lat) float64 0.0\n",
       "Attributes:\n",
       "    layer_style:  <podpac.core.style.Style object at 0x000001F606D28208>\n",
       "    crs:          EPSG:4326\n",
       "    units:        kilogram"
      ]
     },
     "execution_count": 12,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# create UnitsDataArray for kg\n",
    "kgs = kgs_node.create_output_array(coords, data=data)\n",
    "kgs"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [
    {
     "data": {
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       ".xr-var-data-in:checked ~ .xr-var-data {\n",
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       "}\n",
       "\n",
       ".xr-var-data > table {\n",
       "  float: right;\n",
       "}\n",
       "\n",
       ".xr-var-name span,\n",
       ".xr-var-data,\n",
       ".xr-attrs {\n",
       "  padding-left: 25px !important;\n",
       "}\n",
       "\n",
       ".xr-attrs,\n",
       ".xr-var-attrs,\n",
       ".xr-var-data {\n",
       "  grid-column: 1 / -1;\n",
       "}\n",
       "\n",
       "dl.xr-attrs {\n",
       "  padding: 0;\n",
       "  margin: 0;\n",
       "  display: grid;\n",
       "  grid-template-columns: 125px auto;\n",
       "}\n",
       "\n",
       ".xr-attrs dt, dd {\n",
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       "\n",
       ".xr-attrs dt {\n",
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       "}\n",
       "\n",
       ".xr-attrs dt:hover span {\n",
       "  display: inline-block;\n",
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       "\n",
       ".xr-attrs dd {\n",
       "  grid-column: 2;\n",
       "  white-space: pre-wrap;\n",
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       "\n",
       ".xr-icon-database,\n",
       ".xr-icon-file-text2 {\n",
       "  display: inline-block;\n",
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       "  height: 1.5em !important;\n",
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       "  stroke: currentColor;\n",
       "  fill: currentColor;\n",
       "}\n",
       "</style><div class='xr-wrap'><div class='xr-header'><div class='xr-obj-type'>xarray.UnitsDataArray</div><div class='xr-array-name'></div><ul class='xr-dim-list'><li><span class='xr-has-index'>lat</span>: 1</li></ul></div><ul class='xr-sections'><li class='xr-section-item'><div class='xr-array-wrap'><input id='section-ce6e11bb-7c28-495e-b641-5c842fb62624' class='xr-array-in' type='checkbox' ><label for='section-ce6e11bb-7c28-495e-b641-5c842fb62624' title='Show/hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-array-preview xr-preview'><span>1.0</span></div><pre class='xr-array-data'>array([1.])</pre></div></li><li class='xr-section-item'><input id='section-e9722321-9bdf-4b83-9649-3dacf2c80a54' class='xr-section-summary-in' type='checkbox'  checked><label for='section-e9722321-9bdf-4b83-9649-3dacf2c80a54' class='xr-section-summary' >Coordinates: <span>(1)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>lat</span></div><div class='xr-var-dims'>(lat)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>0.0</div><input id='attrs-e158a363-ccc7-4686-afcc-801dad8ad984' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-e158a363-ccc7-4686-afcc-801dad8ad984' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-04bc91e9-7cf6-4dd2-b3a1-29e808f4715d' class='xr-var-data-in' type='checkbox'><label for='data-04bc91e9-7cf6-4dd2-b3a1-29e808f4715d' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><pre class='xr-var-data'>array([0.])</pre></li></ul></div></li><li class='xr-section-item'><input id='section-60609d9c-367d-48ce-888c-66e466e9a306' class='xr-section-summary-in' type='checkbox'  checked><label for='section-60609d9c-367d-48ce-888c-66e466e9a306' class='xr-section-summary' >Attributes: <span>(3)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'><dt><span>layer_style :</span></dt><dd>&lt;podpac.core.style.Style object at 0x000001F606D35FC8&gt;</dd><dt><span>crs :</span></dt><dd>EPSG:4326</dd><dt><span>units :</span></dt><dd>pound</dd></dl></div></li></ul></div></div>"
      ],
      "text/plain": [
       "<xarray.UnitsDataArray (lat: 1)>\n",
       "array([1.])\n",
       "Coordinates:\n",
       "  * lat      (lat) float64 0.0\n",
       "Attributes:\n",
       "    layer_style:  <podpac.core.style.Style object at 0x000001F606D35FC8>\n",
       "    crs:          EPSG:4326\n",
       "    units:        pound"
      ]
     },
     "execution_count": 13,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# create UnitsDataArray for lbs\n",
    "lbs = lbs_node.create_output_array(coords, data=data)\n",
    "lbs"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [
    {
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       "\n",
       ".xr-attrs dt, dd {\n",
       "  padding: 0;\n",
       "  margin: 0;\n",
       "  float: left;\n",
       "  padding-right: 10px;\n",
       "  width: auto;\n",
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       "\n",
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       "\n",
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       "  background: var(--xr-background-color);\n",
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       "\n",
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       "</style><div class='xr-wrap'><div class='xr-header'><div class='xr-obj-type'>xarray.UnitsDataArray</div><div class='xr-array-name'></div><ul class='xr-dim-list'><li><span class='xr-has-index'>lat</span>: 1</li></ul></div><ul class='xr-sections'><li class='xr-section-item'><div class='xr-array-wrap'><input id='section-f982f791-9bb4-44a2-86d0-01fbfe0252a6' class='xr-array-in' type='checkbox' ><label for='section-f982f791-9bb4-44a2-86d0-01fbfe0252a6' title='Show/hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-array-preview xr-preview'><span>1.454</span></div><pre class='xr-array-data'>array([1.45359237])</pre></div></li><li class='xr-section-item'><input id='section-18e3abbb-569f-4e8b-af0d-e9f96a58c1d1' class='xr-section-summary-in' type='checkbox'  checked><label for='section-18e3abbb-569f-4e8b-af0d-e9f96a58c1d1' class='xr-section-summary' >Coordinates: <span>(1)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>lat</span></div><div class='xr-var-dims'>(lat)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>0.0</div><input id='attrs-e7cc3a7c-f987-4537-9767-3ee00ac02581' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-e7cc3a7c-f987-4537-9767-3ee00ac02581' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-c91d19b4-850b-4ade-af8a-1baf9abfb8e1' class='xr-var-data-in' type='checkbox'><label for='data-c91d19b4-850b-4ade-af8a-1baf9abfb8e1' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><pre class='xr-var-data'>array([0.])</pre></li></ul></div></li><li class='xr-section-item'><input id='section-31e97447-a6a6-4785-89e4-a2f2f35ac3b2' class='xr-section-summary-in' type='checkbox'  checked><label for='section-31e97447-a6a6-4785-89e4-a2f2f35ac3b2' class='xr-section-summary' >Attributes: <span>(1)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>kilogram</dd></dl></div></li></ul></div></div>"
      ],
      "text/plain": [
       "<xarray.UnitsDataArray (lat: 1)>\n",
       "array([1.45359237])\n",
       "Coordinates:\n",
       "  * lat      (lat) float64 0.0\n",
       "Attributes:\n",
       "    units:    kilogram"
      ]
     },
     "execution_count": 14,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "kgs + lbs"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {},
   "outputs": [
    {
     "data": {
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       "</style><div class='xr-wrap'><div class='xr-header'><div class='xr-obj-type'>xarray.UnitsDataArray</div><div class='xr-array-name'></div><ul class='xr-dim-list'><li><span class='xr-has-index'>lat</span>: 1</li></ul></div><ul class='xr-sections'><li class='xr-section-item'><div class='xr-array-wrap'><input id='section-53e5e4e7-0980-4a63-a651-c91957d3b682' class='xr-array-in' type='checkbox' ><label for='section-53e5e4e7-0980-4a63-a651-c91957d3b682' title='Show/hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-array-preview xr-preview'><span>3.205</span></div><pre class='xr-array-data'>array([3.20462262])</pre></div></li><li class='xr-section-item'><input id='section-b9271cdc-153c-44cd-82ce-00378290e44c' class='xr-section-summary-in' type='checkbox'  checked><label for='section-b9271cdc-153c-44cd-82ce-00378290e44c' class='xr-section-summary' >Coordinates: <span>(1)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>lat</span></div><div class='xr-var-dims'>(lat)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>0.0</div><input id='attrs-ea5c4f8d-81e7-4e72-be87-e78203de8475' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-ea5c4f8d-81e7-4e72-be87-e78203de8475' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-1694dee6-c723-4c4c-a831-f778da507515' class='xr-var-data-in' type='checkbox'><label for='data-1694dee6-c723-4c4c-a831-f778da507515' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><pre class='xr-var-data'>array([0.])</pre></li></ul></div></li><li class='xr-section-item'><input id='section-50046804-efcf-4422-9862-9a6ad6a01a0f' class='xr-section-summary-in' type='checkbox'  checked><label for='section-50046804-efcf-4422-9862-9a6ad6a01a0f' class='xr-section-summary' >Attributes: <span>(1)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>pound</dd></dl></div></li></ul></div></div>"
      ],
      "text/plain": [
       "<xarray.UnitsDataArray (lat: 1)>\n",
       "array([3.20462262])\n",
       "Coordinates:\n",
       "  * lat      (lat) float64 0.0\n",
       "Attributes:\n",
       "    units:    pound"
      ]
     },
     "execution_count": 15,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# Note, order is important: the result here is in pounds instead of kilograms as above\n",
    "lbs + kgs"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [
    {
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       "}\n",
       "\n",
       ".xr-section-summary-in:disabled + label:before {\n",
       "  color: var(--xr-disabled-color);\n",
       "}\n",
       "\n",
       ".xr-section-summary-in:checked + label:before {\n",
       "  content: '▼';\n",
       "}\n",
       "\n",
       ".xr-section-summary-in:checked + label > span {\n",
       "  display: none;\n",
       "}\n",
       "\n",
       ".xr-section-summary,\n",
       ".xr-section-inline-details {\n",
       "  padding-top: 4px;\n",
       "  padding-bottom: 4px;\n",
       "}\n",
       "\n",
       ".xr-section-inline-details {\n",
       "  grid-column: 2 / -1;\n",
       "}\n",
       "\n",
       ".xr-section-details {\n",
       "  display: none;\n",
       "  grid-column: 1 / -1;\n",
       "  margin-bottom: 5px;\n",
       "}\n",
       "\n",
       ".xr-section-summary-in:checked ~ .xr-section-details {\n",
       "  display: contents;\n",
       "}\n",
       "\n",
       ".xr-array-wrap {\n",
       "  grid-column: 1 / -1;\n",
       "  display: grid;\n",
       "  grid-template-columns: 20px auto;\n",
       "}\n",
       "\n",
       ".xr-array-wrap > label {\n",
       "  grid-column: 1;\n",
       "  vertical-align: top;\n",
       "}\n",
       "\n",
       ".xr-preview {\n",
       "  color: var(--xr-font-color3);\n",
       "}\n",
       "\n",
       ".xr-array-preview,\n",
       ".xr-array-data {\n",
       "  padding: 0 5px !important;\n",
       "  grid-column: 2;\n",
       "}\n",
       "\n",
       ".xr-array-data,\n",
       ".xr-array-in:checked ~ .xr-array-preview {\n",
       "  display: none;\n",
       "}\n",
       "\n",
       ".xr-array-in:checked ~ .xr-array-data,\n",
       ".xr-array-preview {\n",
       "  display: inline-block;\n",
       "}\n",
       "\n",
       ".xr-dim-list {\n",
       "  display: inline-block !important;\n",
       "  list-style: none;\n",
       "  padding: 0 !important;\n",
       "  margin: 0;\n",
       "}\n",
       "\n",
       ".xr-dim-list li {\n",
       "  display: inline-block;\n",
       "  padding: 0;\n",
       "  margin: 0;\n",
       "}\n",
       "\n",
       ".xr-dim-list:before {\n",
       "  content: '(';\n",
       "}\n",
       "\n",
       ".xr-dim-list:after {\n",
       "  content: ')';\n",
       "}\n",
       "\n",
       ".xr-dim-list li:not(:last-child):after {\n",
       "  content: ',';\n",
       "  padding-right: 5px;\n",
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       "\n",
       ".xr-has-index {\n",
       "  font-weight: bold;\n",
       "}\n",
       "\n",
       ".xr-var-list,\n",
       ".xr-var-item {\n",
       "  display: contents;\n",
       "}\n",
       "\n",
       ".xr-var-item > div,\n",
       ".xr-var-item label,\n",
       ".xr-var-item > .xr-var-name span {\n",
       "  background-color: var(--xr-background-color-row-even);\n",
       "  margin-bottom: 0;\n",
       "}\n",
       "\n",
       ".xr-var-item > .xr-var-name:hover span {\n",
       "  padding-right: 5px;\n",
       "}\n",
       "\n",
       ".xr-var-list > li:nth-child(odd) > div,\n",
       ".xr-var-list > li:nth-child(odd) > label,\n",
       ".xr-var-list > li:nth-child(odd) > .xr-var-name span {\n",
       "  background-color: var(--xr-background-color-row-odd);\n",
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       "\n",
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       "  grid-column: 1;\n",
       "}\n",
       "\n",
       ".xr-var-dims {\n",
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       "}\n",
       "\n",
       ".xr-var-dtype {\n",
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       "  text-align: right;\n",
       "  color: var(--xr-font-color2);\n",
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       "\n",
       ".xr-var-preview {\n",
       "  grid-column: 4;\n",
       "}\n",
       "\n",
       ".xr-var-name,\n",
       ".xr-var-dims,\n",
       ".xr-var-dtype,\n",
       ".xr-preview,\n",
       ".xr-attrs dt {\n",
       "  white-space: nowrap;\n",
       "  overflow: hidden;\n",
       "  text-overflow: ellipsis;\n",
       "  padding-right: 10px;\n",
       "}\n",
       "\n",
       ".xr-var-name:hover,\n",
       ".xr-var-dims:hover,\n",
       ".xr-var-dtype:hover,\n",
       ".xr-attrs dt:hover {\n",
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       "  width: auto;\n",
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       "\n",
       ".xr-var-attrs,\n",
       ".xr-var-data {\n",
       "  display: none;\n",
       "  background-color: var(--xr-background-color) !important;\n",
       "  padding-bottom: 5px !important;\n",
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       "\n",
       ".xr-var-attrs-in:checked ~ .xr-var-attrs,\n",
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       "  display: block;\n",
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       "\n",
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       "\n",
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       "\n",
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       ".xr-var-data {\n",
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       "\n",
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       "\n",
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       "\n",
       ".xr-attrs dt {\n",
       "  font-weight: normal;\n",
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       "\n",
       ".xr-attrs dt:hover span {\n",
       "  display: inline-block;\n",
       "  background: var(--xr-background-color);\n",
       "  padding-right: 10px;\n",
       "}\n",
       "\n",
       ".xr-attrs dd {\n",
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       "\n",
       ".xr-icon-database,\n",
       ".xr-icon-file-text2 {\n",
       "  display: inline-block;\n",
       "  vertical-align: middle;\n",
       "  width: 1em;\n",
       "  height: 1.5em !important;\n",
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       "  stroke: currentColor;\n",
       "  fill: currentColor;\n",
       "}\n",
       "</style><div class='xr-wrap'><div class='xr-header'><div class='xr-obj-type'>xarray.UnitsDataArray</div><div class='xr-array-name'></div><ul class='xr-dim-list'><li><span class='xr-has-index'>lat</span>: 1</li></ul></div><ul class='xr-sections'><li class='xr-section-item'><div class='xr-array-wrap'><input id='section-2e6646e1-cf62-4e6c-bcbe-268d0f16598f' class='xr-array-in' type='checkbox' ><label for='section-2e6646e1-cf62-4e6c-bcbe-268d0f16598f' title='Show/hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-array-preview xr-preview'><span>0.4536</span></div><pre class='xr-array-data'>array([0.45359237])</pre></div></li><li class='xr-section-item'><input id='section-d755bf1c-15ec-4d49-9fcf-7e2375adac50' class='xr-section-summary-in' type='checkbox'  checked><label for='section-d755bf1c-15ec-4d49-9fcf-7e2375adac50' class='xr-section-summary' >Coordinates: <span>(1)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>lat</span></div><div class='xr-var-dims'>(lat)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>0.0</div><input id='attrs-f0f8e1f3-fc82-4426-9875-7046ca244722' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-f0f8e1f3-fc82-4426-9875-7046ca244722' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-c98df62e-2f1c-4b90-80b0-fdb847a492bc' class='xr-var-data-in' type='checkbox'><label for='data-c98df62e-2f1c-4b90-80b0-fdb847a492bc' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><pre class='xr-var-data'>array([0.])</pre></li></ul></div></li><li class='xr-section-item'><input id='section-5b191dbf-d9a6-4976-b9ae-3ddff217eede' class='xr-section-summary-in' type='checkbox'  checked><label for='section-5b191dbf-d9a6-4976-b9ae-3ddff217eede' class='xr-section-summary' >Attributes: <span>(1)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>kg</dd></dl></div></li></ul></div></div>"
      ],
      "text/plain": [
       "<xarray.UnitsDataArray (lat: 1)>\n",
       "array([0.45359237])\n",
       "Coordinates:\n",
       "  * lat      (lat) float64 0.0\n",
       "Attributes:\n",
       "    units:    kg"
      ]
     },
     "execution_count": 16,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# We can convert between the units\n",
    "lbs.to('kg')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Cannot convert from 'kilogram' ([mass]) to 'pound ** 2' ([mass] ** 2)\n"
     ]
    }
   ],
   "source": [
    "# Incorrect units results in an error\n",
    "try: \n",
    "    lbs ** 2 + kgs\n",
    "except Exception as e: \n",
    "    print(e)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "<xarray.UnitsDataArray (lat: 1)>\n",
      "array([2.])\n",
      "Coordinates:\n",
      "  * lat      (lat) float64 0.0\n"
     ]
    }
   ],
   "source": [
    "# Unless your settings are such that unit checking is not enabled\n",
    "from podpac import settings\n",
    "with settings:\n",
    "    settings[\"ENABLE_UNITS\"] = False\n",
    "    print (lbs **2 + kgs)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {},
   "outputs": [
    {
     "data": {
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       "</style><div class='xr-wrap'><div class='xr-header'><div class='xr-obj-type'>xarray.UnitsDataArray</div><div class='xr-array-name'></div></div><ul class='xr-sections'><li class='xr-section-item'><div class='xr-array-wrap'><input id='section-c1f82996-45a2-40f4-a82a-0b72cf1a15b0' class='xr-array-in' type='checkbox' ><label for='section-c1f82996-45a2-40f4-a82a-0b72cf1a15b0' title='Show/hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-array-preview xr-preview'><span>1.0</span></div><pre class='xr-array-data'>array(1.)</pre></div></li><li class='xr-section-item'><input id='section-1e3c2389-83df-4247-8a25-09d6593a17c0' class='xr-section-summary-in' type='checkbox' disabled ><label for='section-1e3c2389-83df-4247-8a25-09d6593a17c0' class='xr-section-summary'  title='Expand/collapse section'>Coordinates: <span>(0)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'></ul></div></li><li class='xr-section-item'><input id='section-04c88970-b0dc-4b22-9e12-cc13ca64d55e' class='xr-section-summary-in' type='checkbox'  checked><label for='section-04c88970-b0dc-4b22-9e12-cc13ca64d55e' class='xr-section-summary' >Attributes: <span>(1)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'><dt><span>units :</span></dt><dd>kilogram</dd></dl></div></li></ul></div></div>"
      ],
      "text/plain": [
       "<xarray.UnitsDataArray ()>\n",
       "array(1.)\n",
       "Attributes:\n",
       "    units:    kilogram"
      ]
     },
     "execution_count": 19,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# Units are also preserved over statistical operations\n",
    "kgs.min()"
   ]
  }
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