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Introduction

In geodesy, a reference ellipsoid is a mathematically-defined surface that approximates the geoid, the truer figure of the Earth, or other planetary body. Because of their relative simplicity, reference ellipsoids are used as a preferred surface on which geodetic network computations are performed and point coordinates such as latitude, longitude, and elevation are defined.

Parameters

An ellipsoid can be defined in the Eye4Software Coordinate Calculator or GPS Toolkit using 3 parameters:

• Semi Major Axis ( a );
• Inverse Flattening ( f );
• Squared Eccentricity ( e2 ).

The eccentricity value is optional, because this value can be calculated using the semi major axis and the flattening using the following formula:

 e2 = ( 2.0 * f ) - ( f * f )

Eye4Software GPS Toolkit

Using the Eye4Software GPS Toolkit which is a GPS SDK (Software Developer Kit), you will be able to add coordinate conversions to your own software, scripts or webpages in the blink of an eye. The SDK can be used with various programming environments including: Visual Basic, Visual C++, Visual Basic .NET, Visual C# .NET, VB Script, Borland Delphi, Borland C++ Builder, VBA (Access and Excel) and more.

For more information please have a look at the Eye4Software GPS Toolkit product page.

Eye4Software Coordinate Calculator

Using the Eye4Software Coordinate Calculator, you can convert coordinates from one map datum to another easily, using the user friendly user interface. This software is shipped with a database containing allmost any map datum, reference ellipsoid and map grid around.

For more information, please have a look at the Eye4Software Coordinate Calculator product page.

List of the most common used ellipsoids