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-<!DOCTYPE html>
-<html>
- <head>
- <title>Reading Features From CartoDB using GeoJSON</title>
- <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
- <link rel="stylesheet" href="../theme/default/style.css" type="text/css">
- <link rel="stylesheet" href="style.css" type="text/css">
- <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
- <meta name="apple-mobile-web-app-capable" content="yes">
- <script src="../lib/OpenLayers.js"></script>
- </head>
- <body>
- <h1 id="title">Reading Features From CartoDB using GeoJSON</h1>
- <div id="tags">
- protocol, script, cartodb
- </div>
- <p id="shortdesc">
- Demonstrates how to load features on OpenLayers using CartoDB SQL API.
- </p>
- <div id="map" class="smallmap"></div>
- <div id="docs">
- <p>
- <a href="http://cartodb.com/">CartoDB</a> is an Open Source
- Geopatial Database on the cloud. It allows you to import your
- data in shapefiles, KML, OpenStreeMap files, CSV, etc. and
- then analyze and visualize it. Internally CartoDB uses PostGIS
- 2.0 so all functionality in PostGIS can be used straight
- away. CartoDB exposes two APIS. One
- to <a href="http://developers.cartodb.com/documentation/cartodb-apis.html#maps_api">generate maps</a>
- as tiles with interactivity, and another <a href="http://developers.cartodb.com/documentation/cartodb-apis.html#sql_api">SQL API</a>
- to retrieve vector data using among other formats, GeoJSON. In
- this example we do a very simple query to obtain all protected
- areas in Costa Rica from a public table. You can adapt the SQL
- to include where clauses or complicate geospatial queries.
- </p>
- <p>
- View the source code of this page to see how this is done. And
- check the table on CartoDB
- for <a href="https://examples.cartodb.com/tables/costa_rica_pa/public#/map">Protected Areas in Costa Rica</a>
- </p>
- </div>
- <script>
- var map = new OpenLayers.Map({
- div: "map",
- layers: [
- new OpenLayers.Layer.OSM(),
- new OpenLayers.Layer.Vector("Vectors", {
- projection: new OpenLayers.Projection("EPSG:4326"),
- strategies: [new OpenLayers.Strategy.Fixed()],
- protocol: new OpenLayers.Protocol.Script({
- url: "http://examples.cartodb.com/api/v2/sql",
- params: {
- q: "select * from costa_rica_pa LIMIT 50",
- format: "geojson"
- },
- format: new OpenLayers.Format.GeoJSON({
- ignoreExtraDims: true
- }),
- callbackKey: "callback"
- }),
- eventListeners: {
- "featuresadded": function() {
- this.map.zoomToExtent(this.getDataExtent());
- }
- }
- })
- ]
- });
- </script>
- </body>
-</html>