docs/examples/InstrumentDescription.ipynb

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 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Working with Instrumental Descriptions\n",
    "\n",
    "the instrumental description is loaded by the event source, and consists of a hierarchy of classes in the ctapipe.instrument module, the base of which is the `SubarrayDescription`"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "scrolled": false
   },
   "outputs": [],
   "source": [
    "from ctapipe.utils.datasets import get_dataset_path\n",
    "from ctapipe.io import EventSource\n",
    "import numpy as np\n",
    "\n",
    "#filename = get_dataset_path(\"gamma_test_large.simtel.gz\") # try this one as well\n",
    "filename = get_dataset_path(\"gamma_test_large.simtel.gz\")  \n",
    "\n",
    "with EventSource(filename, max_events=1) as source:\n",
    "    subarray = source.subarray"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## the SubarrayDescription:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "subarray.info()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "subarray.to_table()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "You can also get a table of just the `OpticsDescriptions` (`CameraGeometry` is more complex and can't be stored on a single table row, so each one can be converted to a table separately)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "subarray.to_table(kind='optics')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Make a sub-array with only SC-type telescopes:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "sc_tels =[tel_id for tel_id, tel in subarray.tel.items() if tel.optics.num_mirrors ==  2]\n",
    "newsub = subarray.select_subarray(sc_tels, name=\"SCTels\")\n",
    "newsub.info()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "can also do this by using `Table.group_by`"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Explore some of the details of the telescopes"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "tel = subarray.tel[1]\n",
    "tel"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "tel.optics.mirror_area"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "tel.optics.num_mirror_tiles"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "tel.optics.equivalent_focal_length"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "tel.camera"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "tel.camera.geometry.pix_x"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "%matplotlib inline\n",
    "from ctapipe.visualization import CameraDisplay\n",
    "CameraDisplay(tel.camera.geometry)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "CameraDisplay(subarray.tel[98].camera.geometry)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Plot the subarray\n",
    "\n",
    "We'll make a subarray by telescope type and plot each separately, so they appear in different colors.  We also calculate the radius using the mirror area (and exagerate it a bit).\n",
    "\n",
    "This is just for debugging and info, for any \"real\" use, a `visualization.ArrayDisplay` should be used"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "subarray.peek()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "subarray.footprint"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Get info about the subarray in general"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "subarray.telescope_types"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "subarray.camera_types"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "subarray.optics_types"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "from astropy.coordinates import SkyCoord\n",
    "from ctapipe.coordinates import GroundFrame\n",
    "center = SkyCoord(\"10.0 m\", \"2.0 m\", \"0.0 m\", frame='groundframe')\n",
    "coords = subarray.tel_coords  # a flat list of coordinates by tel_index\n",
    "coords.separation(center)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Telescope IDs vs Indices\n",
    "\n",
    "Note that `subarray.tel` is a dict mapped by `tel_id` (the indentifying number of a telescope).  It is  possible to have telescope IDs that do not start at 0, are not contiguouous (e.g. if a subarray is selected).  Some functions and properties like `tel_coords` are numpy arrays (not dicts) so they are not mapped to the telescope ID, but rather the *index* within this SubarrayDescription. To convert between the two concepts you can do:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "subarray.tel_ids_to_indices([1,5,23])"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "or you can get the indexing array directly in numpy or dict form:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "subarray.tel_index_array"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "subarray.tel_index_array[[1,5,23]]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "subarray.tel_indices[1]  # this is a dict of tel_id -> tel_index, so we can only do one at once"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "ids = subarray.get_tel_ids_for_type(subarray.telescope_types[0])\n",
    "ids"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "idx = subarray.tel_ids_to_indices(ids)\n",
    "idx"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "subarray.tel_coords[idx]"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "so, with that method you can quickly get many telescope positions at once (the alternative is to use the dict `positions` which maps `tel_id` to a position on the ground"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "subarray.positions[1]"
   ]
  }
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