Double or decimal for latitude/longitude values in C#

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Go for double, there are several reasons.

  • Trigonometric functions are available only for double
  • Precision of double (range of 100 nanometers) is far beyond anything you’ll ever require for Lat/Lon values
  • GeoCoordinate Class and third-Party modules (e.g. DotSpatial) also use double for coordinates

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