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The Google Elevation API is not accurate enough at a Building level. You can test it out by using going to http://www.daftlogic.com/sandbox-google-maps-find-altitude.htm Just search for 1 World Trade Center, New York, NY 10007 and then click around, and you'll see that the heights that you get aren't really for the top of a building


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Alternatively, a DEM with global coverage that might suit you is the SRTM 1 second DEM. This was recently released and has a resolution of about 30 metres. Read about it at http://www2.jpl.nasa.gov/srtm/ and download load it (free) at http://earthexplorer.usgs.gov/.


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This probably isn't the type of answer that you are looking for, but I'll try to give a general answer on how one could do this. If we break down your problem into smaller tasks, then the first thing that you need to do, is to get the point that the user clicks on. There is an sample on the OpenLayers site that shows exactly how to get this done. Click ...


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i faced somehow the same problem. For me that worked. instead of EPSG:4326 in my project i used EPSG:28993. mapOptions = {projection:"EPSG:900913",displayProjection: new OpenLayers.Projection("EPSG:4326")}; map = new OpenLayers.Map(mapOptions); googleBaseMap = new OpenLayers.Layer.Google("Google Satellite", {'type' : google.maps.MapTypeId.HYBRID}); ...


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You can use Maps.Me. This does not use Google Maps, instead it is based on OpenStreetMap. It allows downloading maps to use offline - you can download a complete country or state at once. You can add "Bookmarks" on the map for places you are interested in. You can import a KML file as bookmarks. ie email the KML to your phone, then open the file in Maps.Me. ...


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If the root of this question is to avoid the margin used by Google Map API's fitBounds() function then I suggest to look at Google Maps V3 - How to calculate the zoom level for a given bounds question on StackOverflow. It gives you a function to directly calculate the zoom level you need to use to fit the given bounds into the visible area of the map. This ...



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