problem in reading kml data in openlayers

Question

I am trying to read an KML file (point feature) and show it on a vector layer on OSM as the base map. My code seems to have a problem that does not show the features on the map. I don't now if its the problem with reading the data from KML file or is it related to visualizing it by Openlayers. Any help would be appreciated... Thanks!

My code:

<script src="http://www.openlayers.org/api/OpenLayers.js"></script>
    <script>
      function init() {
        map = new OpenLayers.Map("map");
        var mapnik         = new OpenLayers.Layer.OSM();
        var fromProjection = new OpenLayers.Projection("EPSG:4326");   // Transform from WGS 1984
        var toProjection   = new OpenLayers.Projection("EPSG:900913"); // to Spherical Mercator Projection
        var position       = new OpenLayers.LonLat(48.69,31.345).transform( fromProjection, toProjection);
        var zoom           = 12; 
        var layer = new OpenLayers.Layer.Vector("KML", {
            strategies: [new OpenLayers.Strategy.Fixed()],
            protocol: new OpenLayers.Protocol.HTTP({
            url: "points.kml",
            format: new OpenLayers.Format.KML()
            })
        });
        map.addLayers([mapnik, layer]);
        map.addControl(new OpenLayers.Control.LayerSwitcher());
        map.setCenter(position, zoom );
      }

and my kml data:

<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://earth.google.com/kml/2.2">
<Document>
<name>Agencies test</name>
<Folder>
<name>BlahBlah!</name>
<Placemark id="2">
<name>Something here!</name>
<description>test</description>
<LookAt>
<longitude>49.69</longitude>
<latitude>32.345</latitude>
<altitude>0</altitude>
<range>24.63686803544318</range>
<tilt>0</tilt>
<heading>1.387289180270979e-005</heading>
</LookAt>
<Point>
<coordinates>49.69,32.345,0</coordinates>
</Point>
</Placemark>
</Folder>
</Document>
</kml>

Answer 1

Enable web developer extensions and post a better error report - what shows up in the console - please.

Answer 2

I kind of have a hunch that if you loose the fromProjection and toProjection definitions for your map it will display fine. Last week I tried to force the projections as well together with a KML file as data source and it only worked (and displayed fine) when I removed any explicit projection attributes. Just hinting, might be worth a try (I use latest openlayers release from git repo).

another thing you could try on the kml layer itself is set the projection as such:

        projection: map.displayProjection

Keep the info coming.

Answer 3

Your data needs to be in a Geographic xml-formatted format. e.g. - KML or GeoRSS or WFS. Openalyers.Format.XML is really there as a helper class to read generic XML files, so you can't use it as a Layer Format on the map. And then add the layer to your map with that specific format (again... KML or GeoRSS...)

Answer 4

Your code works fine for me. Simply zoom out to view your KML point.

The problem is your point in the KML is at 49.69,32.345 but the position you are zooming in on is at 48.69,31.345.