Strictly speaking, Latitude/Longitude is not a projection. All coordinates in this projection are measured in units of latitude and longitude, based on an ellipsoid or datum. For this projection, the UNIT parameter must be set to any of the angular measurement units listed below.
Angular Measurement Units
| FME Unit Name | Angular Measurement in Degrees |
|---|---|
| DEGREE | 1.0 |
| GRAD | 0.9 |
| GRADE | 0.9 |
| MAPINFO | 0.000001 |
| MIL | 0.05625 |
| MINUTE | 0.01666666666666666666 |
| RADIAN | 57.2957795130823208772 |
| SECOND | 0.00027777777777777777 |
| DECISEC | 0.00002777777777777777 |
| CENTISEC | 0.00000277777777777777 |
| MILLISEC | 0.00000027777777777777 |
| Parameter Name | Description |
|---|---|
| PARM1 |
The minimum longitude that will be used. Longitudes smaller than this will be expressed as positive longitudes by adding 360 to them. This is used to control where the discontinuity in longitude measurements will occur. This value must be less than or equal to 0 and greater than or equal to -360. If not specified, the default is -180. |
| PARM2 |
The maximum longitude that will be used. Longitudes larger than this will be expressed as negative longitudes by subtracting 360 from them. This value must be greater than or equal to 0 and greater than or equal to 360. Although not required, the range between PARM1 and PARM2 is usually 360. If not specified, the default is 180. |
| ORG_LNG | Use this parameter to specify, in degrees relative to Greenwich, a prime meridian (other than Greenwich) that is to be used. |