Hello! I'm having difficulties to understand some basics of openlayers and projection. I'm trying to put tracks in geojson-format on a map. This works just fine with a WMS-Layer, but i seem to miss a crucial connection when trying to display it on an OSM-layer.
I've tried to decipher the example at http://openlayers.org/dev/examples/fusiontables.html(Which uses GeoJSON on OSM) to adapt it to my needs, but as it is a lot more abstract than the very basic example-script i'm starting off, i get stuck even earlier when trying to change the geodata-source to my flatfile. Here is my basic example with WMS: http://poab.org/openlayers/geojson_wms.html And here's the same, but the map-layer is of OSM: http://poab.org/openlayers/geojson_osm.html On both maps i try to display GeoJSON-data from http://poab.org/openlayers/gpx2json.js, with WMS this works fine, with OSM it doesn't. I guess the problem lies within the projection/transformation of the GeoJSON-data, but i'm having a hard time figuring out how this is supposed to work and why the tracks are not displayed at all(Or at least how i can get it to tell me errors while parsing, if there are any). Obviously the WMS-layer is displayed very differently than the OSM-layer, so i assume that the GeoJSON-data also has to be adapted to be OSM-projection so it can be displayed on top of it? A related question: Why does the OSM-Layer need to be transformed to a different projection for centering it, not just setCenter with lon, lat and zoom like WMS? These are probably very basic questions for an experienced user - i'm currently a bit overwhelmed by the amount of information to digest while trying to get a understanding of GIS - i ask for patience, i'll probably post a few more ignorant questions to this list in the next few weeks. Best regards, Christian _______________________________________________ Users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/openlayers-users
