FMEdefines a large number of units(for example,meters,US feet,degrees,radians,etc.).If your coordinate system is measured in a unit that FME does not already know about,you can define the new unit.
Unit definitions may occur in an FME mapping file,as well as in the file:
LocalCoordSysDefs.fme
The syntax of a unit definition is:
UNIT_DEF
UNIT_TYPE
UNIT_ABBREVIATION
UNIT_FACTOR
| Name |
Range |
Description |
Optional |
|---|---|---|---|
|
|
any string |
The name of the unit being defined. |
No |
|
|
ANGLE | LENGTH |
Specifies whether the unit measures angles or lengths. |
No |
|
|
any string |
This abbreviation represents the unit and may be used in coordinate system definitions instead of the
|
No |
|
|
Floating point number |
The size of a unit in metres if it measures length.If the unit measures angle,then this is the size in degrees. |
No |
Example Unit Definition
In this example,we define the unit "GRIDUNIT" (abbreviated as "GRD") where the unit length is 0.999738 meters.
UNIT_DEF GRIDUNIT \
UNIT_TYPE LENGTH \
UNIT_ABBREVIATION GRD \
UNIT_FACTOR 0.999738