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POOpenLayers Adding an encoded polyline with OSM
 

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  1. POOpenLayers Adding an encoded polyline with OSM
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    <p>I am relatively new to open layers, but pretty familiar with the google maps api.</p> <p>I've done the following with google maps before. I am basically trying to replicate the same functionality with open layers/open street maps. But I've run into a puzzle.</p> <pre><code>map = new OpenLayers.Map("map"); wms = new OpenLayers.Layer.WMS( "OpenLayers WMS", "http://vmap0.tiles.osgeo.org/wms/vmap0", {layers: 'basic'} ); osm = new OpenLayers.Layer.OSM(); map.addLayer(wms); epsg4326 = new OpenLayers.Projection("EPSG:4326"); //WGS 1984 projection projectTo = map.getProjectionObject(); //The map projection (Spherical Mercator) var lonLat = new OpenLayers.LonLat(-71.3699930, 43.5412410).transform(epsg4326, projectTo); var zoom=12; map.setCenter (lonLat, zoom); var vectorLayer = new OpenLayers.Layer.Vector("Overlay"); var encoded = "_p~iF~ps|U_ulLnnqC_mqNvxq`@"; var format = new OpenLayers.Format.EncodedPolyline({geometryType:"linestring"}); vectorLayer.addFeatures(format.read(encoded)); map.addLayer(vectorLayer); </code></pre> <p>The way the code is written currently works. It loads the WMS maps, shows the polyline, and centers the map correctly. But that isn't what I want, I want the OSM maps loaded. So if I change this line:</p> <pre><code>map.addLayer(wms); </code></pre> <p>to this:</p> <pre><code>map.addLayer(osm); </code></pre> <p>The osm maps load fine, but the polyline is not shown. I've played with this for a very long time and can't seem to get this working. Does it have something to do with projections? Thanks!</p>
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    1. USJacob Swain
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    1. COReading through a bunch of related topics on SO now and I'm convinced that I need to do something to get the projections set on my polyline, but I'm not sure how to do that.
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      1. USJacob Swain
 

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