blankblank blank

National Geodetic Survey Online Toolkit

The National Geodetic Survey has a set of links online conversion utilities for performing some basic geodetic conversions, including:

  • High-accuracy state plane coordinate system (SPCS) conversions
  • UTM/USNG/geographic coordinate conversions
  • Magnetic declination
  • Surface gravity prediction
  • Azimuth/distance to a second position (or second position from azimuth/distance data)
  • Position from a dual-frequency GPS data file

Plus many more. Some of these are also available as PC programs, but these tend to be old-school DOS-based conversion utilities, not always the most user friendly.

Looking for something else? Enter some keywords below, then click "Search".