Google Maps – What Projection to Use for Google Maps

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I'm loading a WMS layer which comes in WGS84 into Google Maps. From what I've read so far, I should reproject this layer to Google Pseudo Mercator (either 3857/900913). However, when I save the layer in either one of those two projections, it is not displayed in Google Maps, but I can view it in Data Preview of Geoserver. Others with WGS84 are displayed correctly but with a position shift.

Do I really need to reproject the layer? I'm not sure whether it is not just a matter of some inaccuracy.

Best Answer

Yes, you're correct, to display the data it will need to be in the Google Mercator projection (3857/900913). Is your data displaying if it's not being reprojected though?

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[GIS] Openlayers2 and Geoserver: OSM/Google Maps and WMS Overlay

The first thing to check is that your data is really in 4326 (lat/lon) and that GeoServer is reading them in in that projection - check on the DataStore page for "Native Projection" if that is unknown then go to http://prj2epsg.org/search and paste in the contents of your shapefile .prj file, this will give you a correct projection to put in the projection box.

If your shapefile doesn't have a .prj file then you need to go back to the data supplier and ask them what projection the data is in.

[GIS] How to set up the layer order with Google Maps API

how i order it. use

insertAt

first i create layer in object like this.

layer = {}; layer.nrcs_soils= new google.maps.ImageMapType({ getTileUrl: function (coord, zoom) { return getTileWmsUrl(coord, zoom, "nrcs_soils"); }, tileSize: new google.maps.Size(256, 256), opacity: 1, name:'nrcs_soils', alt:{ layer_name:'nrcs_soils' ,order : 0 }, isPng: true });

after that i create simple function add layer to map. add_layer = function(layer_name){ //-- get order from object layer var order_layer =layer[layer_name].alt.order; map.overlayMapTypes.insertAt(order_layer ,layer[layer_name]); }

just call this function for add and order layer from your setting on your object layer. add_layer("nrcs_soils");

or use splice

concept like this.

array = [ 'My', 'name', 'Ruthe' ];

array.splice(1,0,"sur");

console.log('array : '+array); //array : My,sur,name,Ruthe

Best Answer

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