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Query GBIF by drawing on map
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>GBIF search</title> | |
| <meta charset="utf-8" /> | |
| <link | |
| rel="stylesheet" | |
| href="http://cdn.leafletjs.com/leaflet-0.7/leaflet.css" | |
| /> | |
| <link | |
| rel="stylesheet" | |
| href="http://leaflet.github.io/Leaflet.draw/leaflet.draw.css" | |
| /> | |
| <!-- jquery --> | |
| <script src="https://code.jquery.com/jquery-1.12.3.js"></script> | |
| <!-- Wicket --> | |
| <script src="http://rawgit.com/arthur-e/Wicket/master/wicket.js"></script> | |
| </head> | |
| <body style="font-family:sans-serif"> | |
| <p>Simple demonstration of searching GBIF by drawing on a map. Once a shape is drawn, | |
| we use it as the <b>geometry</b> parameter to query | |
| <a href="http://www.gbif.org/developer/occurrence">GBIF's API</a>. The first | |
| 300 occurrences are displayed. Uses <a href="https://github.com/Leaflet/Leaflet.draw">Leaflet.draw</a> | |
| to draw shapes, and <a href="https://github.com/arthur-e/Wicket">Wicket</a> to convert GeoJSON shape to | |
| the WKT format required by GBIF's API. Used <a href="http://bl.ocks.org/d3noob/7730264">Leaflet.draw plugin with options set</a> | |
| by <a href="https://github.com/d3noob">d3noob</a> as a starting point. | |
| </p> | |
| <div id="map" style="width:100%; height: 400px"></div> | |
| <div id="data" style="width:100%;font-size:11px;"></div> | |
| <script | |
| src="http://cdn.leafletjs.com/leaflet-0.7/leaflet.js"> | |
| </script> | |
| <script | |
| src="http://leaflet.github.io/Leaflet.draw/leaflet.draw.js"> | |
| </script> | |
| <script> | |
| var map = L.map('map').setView([0, 0], 2); | |
| mapLink = | |
| '<a href="http://openstreetmap.org">OpenStreetMap</a>'; | |
| L.tileLayer( | |
| 'http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', { | |
| attribution: '© ' + mapLink + ' Contributors', | |
| maxZoom: 18, | |
| }).addTo(map); | |
| var geojson = null; | |
| //-------------------------------------------------------------------------------- | |
| function onEachFeature(feature, layer) { | |
| // does this feature have a property named popupContent? | |
| if (feature.properties && feature.properties.popupContent) { | |
| //console.log(feature.properties.popupContent); | |
| // content must be a string, see http://stackoverflow.com/a/22476287 | |
| layer.bindPopup(String(feature.properties.popupContent)); | |
| } | |
| } | |
| var drawnItems = new L.FeatureGroup(); | |
| map.addLayer(drawnItems); | |
| var drawControl = new L.Control.Draw({ | |
| position: 'topright', | |
| draw: { | |
| marker: false, // turn off marker | |
| polygon: { | |
| shapeOptions: { | |
| color: 'purple' | |
| }, | |
| allowIntersection: false, | |
| drawError: { | |
| color: 'orange', | |
| timeout: 1000 | |
| }, | |
| showArea: true, | |
| metric: false, | |
| repeatMode: true | |
| }, | |
| polyline: { | |
| shapeOptions: { | |
| color: 'red' | |
| }, | |
| }, | |
| rect: { | |
| shapeOptions: { | |
| color: 'green' | |
| }, | |
| }, | |
| circle: { | |
| shapeOptions: { | |
| color: 'steelblue' | |
| }, | |
| } | |
| }, | |
| edit: { | |
| featureGroup: drawnItems | |
| } | |
| }); | |
| map.addControl(drawControl); | |
| map.on('draw:created', function (e) { | |
| var type = e.layerType, | |
| layer = e.layer; | |
| drawnItems.addLayer(layer); | |
| //alert(JSON.stringify(layer.toGeoJSON())); | |
| var shape = JSON.stringify(layer.toGeoJSON()); | |
| $('#data').html(shape); | |
| var wkt = new Wkt.Wkt(); | |
| wkt.read(shape); | |
| $('#data').html('<b>GeoJSON</b><br/>' + shape + '<br/>' + '<b>WKT</b><br/>' + wkt.write()); | |
| // add data points | |
| if (geojson) { | |
| map.removeLayer(geojson); | |
| } | |
| /* | |
| geojson = L.geoJson({"type": "Point", "coordinates": [46.82515,-16.29667]}).addTo(map); | |
| */ | |
| //---------------------------------------------------------------------------- | |
| // GBIF map | |
| $.getJSON('http://api.gbif.org/v1/occurrence/search?geometry=' + wkt.write() + '&limit=300&callback=?', | |
| function(data){ | |
| if (data.results) { | |
| var x = {}; | |
| x.type = "FeatureCollection"; | |
| x.features = []; | |
| for (var i in data.results) { | |
| var feature = {}; | |
| feature.type = "Feature"; | |
| feature.geometry = {}; | |
| feature.geometry.type = "Point"; | |
| feature.geometry.coordinates = [data.results[i].decimalLongitude, data.results[i].decimalLatitude]; | |
| feature.properties = {}; | |
| // Content for the popup | |
| feature.properties.name = data.results[i].key; | |
| feature.properties.popupContent = ''; | |
| if (data.results[i].scientificName) { | |
| feature.properties.popupContent = data.results[i].scientificName + '<br />'; | |
| } | |
| if (data.results[i].institutionCode) { | |
| feature.properties.popupContent += data.results[i].institutionCode + ' '; | |
| } | |
| if (data.results[i].catalogNumber) { | |
| feature.properties.popupContent += data.results[i].catalogNumber; | |
| } | |
| feature.properties.popupContent += '<br />'; | |
| if (data.results[i].locality) { | |
| feature.properties.popupContent += data.results[i].locality; | |
| } | |
| feature.properties.popupContent += '<br />'; | |
| feature.properties.popupContent += '<a href="http://www.gbif.org/occurrence/' + data.results[i].key + '" target="_new">' + data.results[i].key + '</a>' + '<br />'; | |
| //feature.properties.popupContent = data.results[i].key; | |
| x.features.push(feature); | |
| } | |
| //add_data(geojson); | |
| //L.geoJson(x).addTo(map); | |
| geojson = L.geoJson(x, { | |
| style: function (feature) { | |
| return feature.properties && feature.properties.style; | |
| }, | |
| onEachFeature: onEachFeature, | |
| }).addTo(map); | |
| } | |
| } | |
| ); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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Useful trick to serve static content from GitHub with correct MIME type (which otherwise breaks Chrome) http://stackoverflow.com/questions/17341122/link-and-execute-external-javascript-file-hosted-on-github