test_image_overlay_geodetic.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "/home/filipe/.virtualenvs/iris/lib/python2.7/site-packages/folium/__init__.py\n",
      "0.2.0\n"
     ]
    }
   ],
   "source": [
    "import folium\n",
    "\n",
    "print(folium.__file__)\n",
    "print(folium.__version__)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "import numpy as np\n",
    "\n",
    "\n",
    "def sample_data(shape=(73, 145)):\n",
    "    nlats, nlons = shape\n",
    "    lats = np.linspace(-np.pi / 2, np.pi / 2, nlats)\n",
    "    lons = np.linspace(0, 2 * np.pi, nlons)\n",
    "    lons, lats = np.meshgrid(lons, lats)\n",
    "    wave = 0.75 * (np.sin(2 * lats) ** 8) * np.cos(4 * lons)\n",
    "    mean = 0.5 * np.cos(2 * lats) * ((np.sin(2 * lats)) ** 2 + 2)\n",
    "\n",
    "    lats = np.rad2deg(lats)\n",
    "    lons = np.rad2deg(lons)\n",
    "    data = wave + mean\n",
    "\n",
    "    return lons, lats, data\n",
    "\n",
    "\n",
    "lon, lat, data = sample_data(shape=(73, 145))\n",
    "lon -= 180"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "%matplotlib inline\n",
    "\n",
    "import matplotlib\n",
    "\n",
    "cm = matplotlib.cm.get_cmap('cubehelix')\n",
    "\n",
    "normed_data = (data - data.min()) / (data.max() - data.min())\n",
    "colored_data = cm(normed_data)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Bad"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
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            <script src="https://rawgithub.com/lvoogdt/Leaflet.awesome-markers/2.0/develop/dist/leaflet.awesome-markers.js"></script>
        
        
        
            
        
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            <link rel="stylesheet" href="https://raw.githubusercontent.com/python-visualization/folium/master/folium/templates/leaflet.awesome.rotate.css" />
        
        
        
            
            <style>

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                width: 100%;
                height: 100%;
                margin: 0;
                padding: 0;
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            #map {
                position:absolute;
                top:0;
                bottom:0;
                right:0;
                left:0;
                }
            </style>
            
        
            
            <style> #map_2ad363a8cef341089e45a98a0b277945 {
                position : relative;
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                height: 100.0%;
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                top: 0.0%;
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            </style>
        
        
        
        </head>
        <body>
            
        
            
            <div class="folium-map" id="map_2ad363a8cef341089e45a98a0b277945" ></div>
        
        
        
        </body>
        <script>
            
        
            

            var southWest = L.latLng(-90, -180);
            var northEast = L.latLng(90, 180);
            var bounds = L.latLngBounds(southWest, northEast);

            var map_2ad363a8cef341089e45a98a0b277945 = L.map('map_2ad363a8cef341089e45a98a0b277945', {
                                           center:[0.0,-8.59229760768e-17],
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                                           maxBounds: bounds,
                                           layers: [],
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            var tile_layer_09b541c3e2d14fba96490b0977370934 = L.tileLayer(
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                    minZoom: 1,
                    attribution: 'Data by <a href="http://openstreetmap.org">OpenStreetMap</a>, under <a href="http://www.openstreetmap.org/copyright">ODbL</a>.',
                    detectRetina: false
                    }
                ).addTo(map_2ad363a8cef341089e45a98a0b277945);

        
        
            
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        </script>
        \" style=\"position:absolute;width:100%;height:100%;left:0;top:0;\"></iframe></div></div>"
      ],
      "text/plain": [
       "<folium.folium.Map at 0x7f32619046d0>"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "from folium import plugins\n",
    "\n",
    "mapa = folium.Map(location=[lat.mean(), lon.mean()], zoom_start=1)\n",
    "\n",
    "plugins.ImageOverlay(colored_data,\n",
    "                     [[lat.min(), lon.min()], [lat.max(), lon.max()]],\n",
    "                     opacity=0.25).add_to(mapa)\n",
    "\n",
    "mapa"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Good"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/html": [
       "<div style=\"width:100%;\"><div style=\"position:relative;width:100%;height:0;padding-bottom:60%;\"><iframe src=\"data:text/html;base64,
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            <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
        
        
        
            
        
            <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
        
        
        
            
        
            <script src="https://rawgithub.com/lvoogdt/Leaflet.awesome-markers/2.0/develop/dist/leaflet.awesome-markers.js"></script>
        
        
        
            
        
            <script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet.markercluster/0.4.0/leaflet.markercluster-src.js"></script>
        
        
        
            
        
            <script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet.markercluster/0.4.0/leaflet.markercluster.js"></script>
        
        
        
            
        
            <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.3/leaflet.css" />
        
        
        
            
        
            <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" />
        
        
        
            
        
            <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap-theme.min.css" />
        
        
        
            
        
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            <link rel="stylesheet" href="https://raw.githubusercontent.com/python-visualization/folium/master/folium/templates/leaflet.awesome.rotate.css" />
        
        
        
            
            <style>

            html, body {
                width: 100%;
                height: 100%;
                margin: 0;
                padding: 0;
                }

            #map {
                position:absolute;
                top:0;
                bottom:0;
                right:0;
                left:0;
                }
            </style>
            
        
            
            <style> #map_eb474e297d0a468192f9ebf1f38e348b {
                position : relative;
                width : 100.0%;
                height: 100.0%;
                left: 0.0%;
                top: 0.0%;
                }
            </style>
        
        
        
        </head>
        <body>
            
        
            
            <div class="folium-map" id="map_eb474e297d0a468192f9ebf1f38e348b" ></div>
        
        
        
        </body>
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            var northEast = L.latLng(90, 180);
            var bounds = L.latLngBounds(southWest, northEast);

            var map_eb474e297d0a468192f9ebf1f38e348b = L.map('map_eb474e297d0a468192f9ebf1f38e348b', {
                                           center:[0.0,-8.59229760768e-17],
                                           zoom: 1,
                                           maxBounds: bounds,
                                           layers: [],
                                           crs: L.CRS.EPSG3857
                                         });
            
        
        
            
            var tile_layer_8e0a8cfa9d90475688c03016208f53f0 = L.tileLayer(
                'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
                {
                    maxZoom: 18,
                    minZoom: 1,
                    attribution: 'Data by <a href="http://openstreetmap.org">OpenStreetMap</a>, under <a href="http://www.openstreetmap.org/copyright">ODbL</a>.',
                    detectRetina: false
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                var image_overlay_2da96a51a122468d9f5b2db3d44e9139 = L.imageOverlay(
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                    [[-90.0, -180.0], [90.0, 180.0]],
                    {"opacity": 0.25}
                    ).addTo(map_eb474e297d0a468192f9ebf1f38e348b);
            
        
        
        </script>
        \" style=\"position:absolute;width:100%;height:100%;left:0;top:0;\"></iframe></div></div>"
      ],
      "text/plain": [
       "<folium.folium.Map at 0x7f3261904150>"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "mapa = folium.Map(location=[lat.mean(), lon.mean()], zoom_start=1)\n",
    "\n",
    "plugins.ImageOverlay(colored_data,\n",
    "                     [[lat.min(), lon.min()], [lat.max(), lon.max()]], # If I change my lat to +-85.051129 this works.\n",
    "                     mercator_project=True,\n",
    "                     opacity=0.25).add_to(mapa)\n",
    "\n",
    "mapa"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Same as above but with cartopy"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/html": [
       "<div style=\"width:100%;\"><div style=\"position:relative;width:100%;height:0;padding-bottom:60%;\"><iframe src=\"data:text/html;base64,
        <!DOCTYPE html>
        <head>
            
        
            <meta http-equiv="content-type" content="text/html; charset=UTF-8" />
        
            
        
            <script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.3/leaflet.js"></script>
        
        
        
            
        
            <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
        
        
        
            
        
            <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
        
        
        
            
        
            <script src="https://rawgithub.com/lvoogdt/Leaflet.awesome-markers/2.0/develop/dist/leaflet.awesome-markers.js"></script>
        
        
        
            
        
            <script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet.markercluster/0.4.0/leaflet.markercluster-src.js"></script>
        
        
        
            
        
            <script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet.markercluster/0.4.0/leaflet.markercluster.js"></script>
        
        
        
            
        
            <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.3/leaflet.css" />
        
        
        
            
        
            <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" />
        
        
        
            
        
            <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap-theme.min.css" />
        
        
        
            
        
            <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.1.0/css/font-awesome.min.css" />
        
        
        
            
        
            <link rel="stylesheet" href="https://rawgit.com/lvoogdt/Leaflet.awesome-markers/2.0/develop/dist/leaflet.awesome-markers.css" />
        
        
        
            
        
            <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/leaflet.markercluster/0.4.0/MarkerCluster.Default.css" />
        
        
        
            
        
            <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/leaflet.markercluster/0.4.0/MarkerCluster.css" />
        
        
        
            
        
            <link rel="stylesheet" href="https://raw.githubusercontent.com/python-visualization/folium/master/folium/templates/leaflet.awesome.rotate.css" />
        
        
        
            
            <style>

            html, body {
                width: 100%;
                height: 100%;
                margin: 0;
                padding: 0;
                }

            #map {
                position:absolute;
                top:0;
                bottom:0;
                right:0;
                left:0;
                }
            </style>
            
        
            
            <style> #map_16025a7a58554455a60980f91fa5bbe4 {
                position : relative;
                width : 100.0%;
                height: 100.0%;
                left: 0.0%;
                top: 0.0%;
                }
            </style>
        
        
        
        </head>
        <body>
            
        
            
            <div class="folium-map" id="map_16025a7a58554455a60980f91fa5bbe4" ></div>
        
        
        
        </body>
        <script>
            
        
            

            var southWest = L.latLng(-90, -180);
            var northEast = L.latLng(90, 180);
            var bounds = L.latLngBounds(southWest, northEast);

            var map_16025a7a58554455a60980f91fa5bbe4 = L.map('map_16025a7a58554455a60980f91fa5bbe4', {
                                           center:[0.0,-8.59229760768e-17],
                                           zoom: 1,
                                           maxBounds: bounds,
                                           layers: [],
                                           crs: L.CRS.EPSG3857
                                         });
            
        
        
            
            var tile_layer_9ec4275a61534f4aa38249ae59faa27e = L.tileLayer(
                'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
                {
                    maxZoom: 18,
                    minZoom: 1,
                    attribution: 'Data by <a href="http://openstreetmap.org">OpenStreetMap</a>, under <a href="http://www.openstreetmap.org/copyright">ODbL</a>.',
                    detectRetina: false
                    }
                ).addTo(map_16025a7a58554455a60980f91fa5bbe4);

        
        
            
                var image_overlay_751e3381ea054e4d9ea1ac0db509c84e = L.imageOverlay(
                    'data:image/png;base64,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',
                    [[-90.0, -180.0], [90.0, 180.0]],
                    {"opacity": 0.25}
                    ).addTo(map_16025a7a58554455a60980f91fa5bbe4);
            
        
        
        </script>
        \" style=\"position:absolute;width:100%;height:100%;left:0;top:0;\"></iframe></div></div>"
      ],
      "text/plain": [
       "<folium.folium.Map at 0x7f325962d290>"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "import cartopy.crs as ccrs\n",
    "from cartopy.img_transform import warp_array\n",
    "\n",
    "source_extent = [lon.min(), lon.max(), lat.min(), lat.max()]\n",
    "\n",
    "new_data = warp_array(colored_data,\n",
    "                      target_proj=ccrs.GOOGLE_MERCATOR,\n",
    "                      source_proj=ccrs.PlateCarree(),\n",
    "                      target_res=data.shape,\n",
    "                      source_extent=source_extent,\n",
    "                      target_extent=None,\n",
    "                      mask_extrapolated=False)\n",
    "\n",
    "\n",
    "mapa = folium.Map(location=[lat.mean(), lon.mean()], zoom_start=1)\n",
    "\n",
    "plugins.ImageOverlay(new_data[0],\n",
    "                     [[lat.min(), lon.min()], [lat.max(), lon.max()]],\n",
    "                     opacity=0.25).add_to(mapa)\n",
    "\n",
    "mapa"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "TODO: Try [rasterio](https://github.com/mapbox/rasterio/blob/ca75cf0a842943c1b3da4522e6ea3500215130fd/docs/reproject.rst).  Rasterio can warp images and arrays."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Compare to original"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/html": [
       "\n",
       "        <iframe\n",
       "            width=\"900\"\n",
       "            height=\"750\"\n",
       "            src=\"http://scitools.org.uk/cartopy/docs/latest/examples/waves.html\"\n",
       "            frameborder=\"0\"\n",
       "            allowfullscreen\n",
       "        ></iframe>\n",
       "        "
      ],
      "text/plain": [
       "<IPython.lib.display.IFrame at 0x7f325a8f2c10>"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "from IPython.display import IFrame\n",
    "\n",
    "IFrame(\"http://scitools.org.uk/cartopy/docs/latest/examples/waves.html\", width=900, height=750)"
   ]
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Iris (Python 2)",
   "language": "python",
   "name": "iris_python2"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 2
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython2",
   "version": "2.7.8"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 0
}