EllipsoidType Enumeration

Standard ellipsoids.

Syntax

Visual Basic

'Declaration
 
Public Enum EllipsoidType 
   Inherits System.Enum

C#

public enum EllipsoidType : System.Enum 

Members

Member	Description
Airy	The Airy map datum
Australian	The Australian national map datum.
Bessel1841	The Bessel 1841 map datum.
Clarke1866	The Clark 1866 map datum.
Clarke1880	The Clark 1880 map datum.
Everest	The Everest map datum.
GRS1980	The GRS80 map datum.
Hayford	The Hayford map datum.
International	The International map datum.
Krassovsky	The Krassovsky map datum.
NAD83	The NAD 83 map datum
WGS72	The WGS 72 map datum.
WGS84	The WGS 84 map datum.

Remarks

For many maps, including nearly all maps in commercial atlases, it may be assumed that the Earth is a sphere. Actually, it is more nearly an oblate ellipsoid of revolution, also called an oblate shperoid. This is an ellipse rotated about its shorter axis. The flattening of the ellipse for the Earth is only about one part in three hundred; but it is sufficient to become a necessary part of calculations in plotting accurate maps at a scale of 1:100 000 or larger, and is significant even for 1:5 000 000-scale maps of the United States, affecting plotted shapes by up to 2/3 percent. On small-scale maps, including single-sheet worldRect maps, the oblateness is negligble.

The Earth is not an exact ellipsoid, and deviations from this shape are continuously evaluated. The geoid is the name given to the shape that the Earth would assume if it were measured at mean sea-level. This is an undulating surface that varies not more than about a hundred metres above or below a well-fitting ellipsoid, a variation far less than the ellipsoid varies from the sphere. It is important to remember that elevations and contour lines on the Earth are reported relative to the geoid, not the ellipsoid. Latitude, Longitude and all plane coordinate systems, on the other hand, are determined with respect to the ellipsoid.

Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2