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 the LocalCoordSysDefs.fme. The syntax of an ellipsoid definition is:
ELLIPSOID_DEF <ellipsoidName> \
DESC_NM <descriptive name> \
SOURCE <source> \
E_RAD <equator radius> \
P_RAD <polar radius>
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
|
Name |
Range |
Description |
Optional |
|
<ellipsoidName> |
any string |
The name of the ellipsoid being defined. |
No |
|
<descriptive name> |
any string |
A descriptive name for the ellipsoid. |
Yes |
|
<source> |
any string |
The individual or agency providing the ellipsoid parameters. |
Yes |
|
<equator radius> |
floating point value |
The radius of the ellipsoid in metres at the equator. |
No |
|
<polar radius> |
floating point value |
The radius of the ellipsoid in metres in the polar direction. |
No |