Certain sites may require an ellipsoid that is not predefined in the FME. In such a case, a custom ellipsoid may be created. Ellipsoid definitions may occur in an FME mapping file, as well as in theLocalCoordSysDefs.fme.
The syntax of an ellipsoid definition is:
ELLIPSOID_DEF
DESC_NM
SOURCE
E_RAD
P_RAD
Example Ellipsoid Definition
This mapping file fragment defines a sample ellipsoid:
ELLIPSOID_DEF myEllipse \
DESC_NM “Safe Sample Ellipse” \
SOURCE “Safe Software Inc.” \
E_RAD 6377340.128 \
P_RAD 63356034.448
Ellipsoid Definition Parameters
Name |
Range | Description | Optional |
|---|---|---|---|
任何字符串 |
The name of the ellipsoid being defined. |
No |
|
<描述性名称> |
任何字符串 |
A descriptive name for the ellipsoid. |
Yes |
<所以urce> |
任何字符串 |
The individual or agency providing the ellipsoid parameters. |
Yes |
<赤道半径> |
floating point value |
The radius of the ellipsoid in meters at the equator. |
No |
floating point value |
The radius of the ellipsoid in meters in the polar direction. |
No |