1-tutorials/11-measuring-distances.ipynb

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    "# Measuring distances \n",
    "\n",
    "<img align=\"right\" src=\"https://movingpandas.github.io/movingpandas/assets/img/movingpandas.png\">\n",
    "\n",
    "[![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/movingpandas/movingpandas-examples/main?filepath=1-tutorials/11-measuring-distances.ipynb)\n",
    "[![IPYNB](https://img.shields.io/badge/view-ipynb-hotpink)](https://github.com/movingpandas/movingpandas-examples/blob/main/1-tutorials/11-measuring-distances.ipynb)\n",
    "[![HTML](https://img.shields.io/badge/view-html-green)](https://movingpandas.github.io/movingpandas-website/1-tutorials/11-measuring-distances.html)\n",
    "\n",
    "Distances can be computed between trajectories as well as between trajectories and other geometry objects. \n",
    "The implemented distance measures are:\n",
    "\n",
    "* [Shortest distance](https://movingpandas.readthedocs.io/en/main/trajectory.html#movingpandas.Trajectory.distance)\n",
    "* [Hausdorff distance](https://movingpandas.readthedocs.io/en/main/trajectory.html#movingpandas.Trajectory.hausdorff_distance)\n"
   ]
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  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import pandas as pd\n",
    "import geopandas as gpd\n",
    "import movingpandas as mpd\n",
    "import shapely as shp\n",
    "import hvplot.pandas \n",
    "import matplotlib.pyplot as plt\n",
    "\n",
    "from geopandas import GeoDataFrame, read_file\n",
    "from shapely.geometry import Point, LineString, Polygon\n",
    "from datetime import datetime, timedelta\n",
    "from holoviews import opts, dim\n",
    "\n",
    "import warnings\n",
    "warnings.filterwarnings('ignore')\n",
    "\n",
    "plot_defaults = {'linewidth':5, 'capstyle':'round', 'figsize':(9,3), 'legend':True}\n",
    "opts.defaults(opts.Overlay(active_tools=['wheel_zoom']))\n",
    "hvplot_defaults = {'tiles':'CartoLight', 'frame_height':320, 'frame_width':320, 'cmap':'Viridis', 'colorbar':True}\n",
    "\n",
    "mpd.show_versions()"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Measuring distances between trajectories"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "df = pd.DataFrame([\n",
    "  {'geometry':Point(0,0), 't':datetime(2018,1,1,12,0,0)},\n",
    "  {'geometry':Point(6,0), 't':datetime(2018,1,1,12,6,0)},\n",
    "  {'geometry':Point(6,6), 't':datetime(2018,1,1,12,10,0)},\n",
    "  {'geometry':Point(9,9), 't':datetime(2018,1,1,12,15,0)}\n",
    "]).set_index('t')\n",
    "geo_df = GeoDataFrame(df, crs=31256)\n",
    "toy_traj = mpd.Trajectory(geo_df, 1)\n",
    "toy_traj.df"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "df = pd.DataFrame([\n",
    "  {'geometry':Point(3,3), 't':datetime(2018,1,1,12,0,0)},\n",
    "  {'geometry':Point(3,9), 't':datetime(2018,1,1,12,6,0)},\n",
    "  {'geometry':Point(2,9), 't':datetime(2018,1,1,12,10,0)},\n",
    "  {'geometry':Point(0,7), 't':datetime(2018,1,1,12,15,0)}\n",
    "]).set_index('t')\n",
    "geo_df = GeoDataFrame(df, crs=31256)\n",
    "toy_traj2 = mpd.Trajectory(geo_df, 1)\n",
    "toy_traj2.df\n",
    "\n",
    "ax = toy_traj.plot()\n",
    "toy_traj2.plot(ax=ax, color='red')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "print(f'Distance: {toy_traj.distance(toy_traj2)} meters')\n",
    "print(f'Hausdorff distance: {toy_traj.hausdorff_distance(toy_traj2):.2f} meters')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "tags": []
   },
   "outputs": [],
   "source": [
    "print(f'Distance: {toy_traj.distance(toy_traj2, units=\"cm\")} cm')\n",
    "print(f'Hausdorff distance: {toy_traj.hausdorff_distance(toy_traj2, units=\"km\"):.6f} km')"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Measuring distances between trajectories and other geometry objects"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "pt = Point(1, 5)\n",
    "line = LineString([(3,3), (3,9)])\n",
    "\n",
    "ax = toy_traj.plot()\n",
    "gpd.GeoSeries(pt).plot(ax=ax, color='red')\n",
    "gpd.GeoSeries(line).plot(ax=ax, color='red')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "print(f'Distance: {toy_traj.distance(pt)}')\n",
    "print(f'Hausdorff distance: {toy_traj.hausdorff_distance(pt):.2f}')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "print(f'Distance: {toy_traj.distance(line)}')\n",
    "print(f'Hausdorff distance: {toy_traj.hausdorff_distance(line)}')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "print(f'Distance: {toy_traj.distance(line, units=\"cm\")} cm')\n",
    "print(f'Hausdorff distance: {toy_traj.hausdorff_distance(line, units=\"km\"):.6f} km')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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