» CoordTrans - Convert geographic coordinates between UTM, WGS84, NAD83, NAD27 and other national grids.
» Decimaldegrees - Investigation of and experimentation with various GIS technologies, and the Internet. Latitude, longitude conversion and geocoding tools.
» SeisSoft - Producers of projection and datum transform software.
» ZipMath - World database with latitude and longitude coordinates. Includes formula for calculating the distance between any two world cities.
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