Tatukgis Calculator
TatukGIS Datum Conversion Calculator (free download) -InstructionsE-mail questions to, Text byRevision: 20 May 2002This calculator is being supplied courtesy of,the maker of a royalty-free GIS development toolkit and aerial imageryrectification software. The program provides converting between UTM,Long/Lat, and X,Y,Z coordinates with a large selection of datums and projections.There are MANY datums to choose from.Examples:In the left panel of the above example, an NAD-27 datum, UTM positionhas been entered in Northing, Easting, Height, Datum, Projection, and Zone.In the right panel the NAD-27 position is being converted to the WGS-84datum. It is interesting see that UTM northing is a significant 209meters more than with the NAD-27 datum. The height is about 39 meters different,but this is not a geodetic (actual) difference, but the difference in thetwoellipsoids.In this example, the NAD-27 UTM position is being converted to WGS-84Longitude and Latitude.
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In order to do this, the WGS-84 Projectionmust be set to Geodetic. Also note that the ellipsoids of thedatums are displayed under the datums.Description of Geodetic Coordinates:Geodetic coordinates consist of geodetic latitude (f), geodeticlongitude (l), and geodetic height (h) which define the position of a pointon, or near, the surface of the earth with respect to a reference ellipsoid.Their relationship to the reference ellipsoid is shown in the figure below.The angle between the normal SP and the equatorial (X-Y) plane is calledthe geodetic latitude (f) of point P. The meridian plane containingpoint P is defined as the half-plane containing the Z-axis and point P.The angle between the prime meridian (X-Z) plane and the meridian containingpoint P is the geodetic longitude (l) of point P. Geodetic longitudeis not defined when P lies on the Z-axis. The distance from Q toP is called the geodetic or ellipsoidal height (h).Description of Geocentric Coordinates:Geocentric coordinates are Cartesian coordinates (X, Y, Z) thatdefine the position of a point with respect to the center of mass of theearth.
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The origin of the coordinate system is at the center of thereference ellipsoid.The coordinate system is a right-handed system, with the positiveX axis emerging from the ellipsoid at the equator on the prime meridian,and the positive Z axis emerging from the ellipsoid at the north pole.