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You may check http://vterrain.org/Imagery/WholeEarth/ for links to satellite imagery, or http://www.naturalearthdata.com/downloads/10m-raster-data/ for raster images. These images can be tweaked in Photoshop to get your own look&feel and rendered with MapTiler into tiles - check http://examples.webglearth.com/#customtiles and esp. ...


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How are you defining these "Euclidean distances"? Just using lat-long as x-y cartesian coordinates? That will work fairly well for small areas but at some point you have to realise that the X-coordinates are getting closer together at the poles. If I'm standing two metres from the north pole my feet could be at maybe 30W and 30E (perhaps I do the ...


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Thank you for the input. I've solved my issue. Long story short, I was importing the wrong elevation model file. See, the elevation data with which I'm working is an Arc grid, so several files work together to provide a meaningful elevation model in QGIS. (Forgive the triviality here, but this is new to me. In my case, I was importing dem_10.ovr, which ...


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If you are planning to perform spatial analysis using your data, I suggest you to reproject all your data into one projection, either using ArcGIS or FME. Sometimes the reprojections does not work perfectly on the first try, you may need to try a couple times to get it right.


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If you've access to ArcGIS, open a new map, add a 'basemap' from the server, with a known coordinate system, and then add your two data files. One or both of them will come in without a defined coordinate system. Then change the coordinate system on the MXD until they all line up properly. The one that works will be the coordinate system to assign to your ...


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You are right that the +datum=nad27 overrides the +towgs84 parameters, but only in that part of the world that is covered by the nad27 transformation grid. El Salvador is one of the countries in Central America, that has adopted the North American Datum, but is not covered by the grid. You can load the conus file used for the NAD27 transformation (located ...



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