democratiser-geospatial/service_wms_canada.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "from owslib.wms import WebMapService"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "wms = WebMapService('http://cartes.geogratis.gc.ca/wms/elevation_fr?', version='1.3.0')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Propriétés du service web WMS"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'WMS'"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "wms.identification.type"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'1.3.0'"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "wms.identification.version"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "\"Service de cartographie Web (WMS) pour les données d'élévation\""
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "wms.identification.title"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "\"Ressources naturelles Canada offre un accès aux données d'élévation par le biais d'un service de cartographie Web communément appelé Web Mapping Service (WMS) dont les spécifications sont définies par l'Open Geospatial Consortium (OGC).\""
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "wms.identification.abstract"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['WMS-Elevation',\n",
       " 'cdsm.color-shaded-relief',\n",
       " 'cdsm.color-shaded-relief.legend',\n",
       " 'cdem.color-shaded-relief',\n",
       " 'cdem.color-shaded-relief.legend']"
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "list(wms.contents)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Propriétés d'une couche du service web WMS"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "\"Service de cartographie Web (WMS) pour les données d'élévation\""
      ]
     },
     "execution_count": 9,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "wms['WMS-Elevation'].title"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "(-180.0, -90.0, 180.0, 90.0)"
      ]
     },
     "execution_count": 10,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "wms['WMS-Elevation'].boundingBoxWGS84"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['EPSG:26708',\n",
       " 'EPSG:102018',\n",
       " 'EPSG:32182',\n",
       " 'EPSG:26718',\n",
       " 'EPSG:3575',\n",
       " 'EPSG:26922',\n",
       " 'EPSG:26919',\n",
       " 'EPSG:54030',\n",
       " 'EPSG:32186',\n",
       " 'EPSG:102008',\n",
       " 'EPSG:26714',\n",
       " 'EPSG:41001',\n",
       " 'EPSG:26709',\n",
       " 'EPSG:32184',\n",
       " 'EPSG:26909',\n",
       " 'EPSG:54016',\n",
       " 'EPSG:26712',\n",
       " 'EPSG:54004',\n",
       " 'EPSG:32189',\n",
       " 'EPSG:3857',\n",
       " 'EPSG:26716',\n",
       " 'EPSG:3579',\n",
       " 'EPSG:32185',\n",
       " 'EPSG:26711',\n",
       " 'EPSG:2952',\n",
       " 'EPSG:3574',\n",
       " 'EPSG:32193',\n",
       " 'EPSG:26713',\n",
       " 'EPSG:32187',\n",
       " 'EPSG:2295',\n",
       " 'EPSG:2294',\n",
       " 'EPSG:32188',\n",
       " 'EPSG:3578',\n",
       " 'EPSG:3573',\n",
       " 'EPSG:42304',\n",
       " 'EPSG:102002',\n",
       " 'EPSG:3400',\n",
       " 'EPSG:3395',\n",
       " 'EPSG:32183',\n",
       " 'EPSG:26917',\n",
       " 'EPSG:104306',\n",
       " 'EPSG:53016',\n",
       " 'EPSG:102017',\n",
       " 'EPSG:26707',\n",
       " 'EPSG:102016',\n",
       " 'EPSG:2019',\n",
       " 'EPSG:32181',\n",
       " 'EPSG:3979',\n",
       " 'EPSG:26907',\n",
       " 'EPSG:102185',\n",
       " 'EPSG:4326',\n",
       " 'EPSG:3401',\n",
       " 'EPSG:3799',\n",
       " 'EPSG:26911',\n",
       " 'EPSG:26912',\n",
       " 'EPSG:54009',\n",
       " 'EPSG:26721',\n",
       " 'EPSG:26908',\n",
       " 'EPSG:102100',\n",
       " 'EPSG:26717',\n",
       " 'EPSG:3978',\n",
       " 'EPSG:32191',\n",
       " 'EPSG:26914',\n",
       " 'EPSG:32194',\n",
       " 'EPSG:32197',\n",
       " 'EPSG:26710',\n",
       " 'EPSG:32198',\n",
       " 'EPSG:3576',\n",
       " 'EPSG:54003',\n",
       " 'EPSG:102009',\n",
       " 'EPSG:26918',\n",
       " 'EPSG:42101',\n",
       " 'EPSG:26916',\n",
       " 'EPSG:4269',\n",
       " 'EPSG:26722',\n",
       " 'EPSG:3571',\n",
       " 'EPSG:26719',\n",
       " 'EPSG:54008',\n",
       " 'EPSG:4617',\n",
       " 'EPSG:26910',\n",
       " 'EPSG:26715',\n",
       " 'EPSG:900913',\n",
       " 'EPSG:32196',\n",
       " 'EPSG:26920',\n",
       " 'EPSG:32195',\n",
       " 'EPSG:32190',\n",
       " 'EPSG:32192',\n",
       " 'EPSG:3572',\n",
       " 'EPSG:102184',\n",
       " 'EPSG:26915',\n",
       " 'EPSG:26720',\n",
       " 'EPSG:26913',\n",
       " 'EPSG:26921']"
      ]
     },
     "execution_count": 11,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "wms['WMS-Elevation'].crsOptions"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "{}"
      ]
     },
     "execution_count": 12,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "wms['WMS-Elevation'].styles"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['GetCapabilities', 'GetMap', 'GetFeatureInfo', 'GetLegendGraphic']"
      ]
     },
     "execution_count": 13,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "[op.name for op in wms.operations]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['image/png', 'image/gif', 'image/jpeg', 'image/png; mode=8bit', 'image/tiff']"
      ]
     },
     "execution_count": 14,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "wms.getOperationByName('GetMap').formatOptions"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exemple de requête"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {},
   "outputs": [],
   "source": [
    "img = wms.getmap(layers=['WMS-Elevation'],\n",
    "                 srs='EPSG:4269',\n",
    "                 bbox=(-72.25,-71.25,46.25,47.25),\n",
    "                 size=(450,450),\n",
    "                 format='image/png',\n",
    "                 transparent=True)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [],
   "source": [
    "out = open('canada-wms.png', 'wb')\n",
    "out.write(img.read())\n",
    "out.close()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "![](canada-cdsm.png)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
 ],
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