IBM® Informix® 12.10
Predefined spatial reference systems
The spatial_references table contains over 1000 predefined spatial reference systems.
The following table lists the predefined spatial reference systems.
| Authority | Authority IDs (SRIDs) | Description |
|---|---|---|
| EPSG | 2000 - 2999 | Projection systems defined by the EPSG |
| EPSG | 46008 | GEOGCS NAD 1927 |
| EPSG | 4759 | GEOGCS NAD 1983_NSRS2007 |
| EPSG | 4322 | GEOGCS WGS 1972 |
| EPSG | 4326 | GEOGCS WGS 1984 |
| EPSG | 4760 | GEOGCS WGS 1966 |
| EPSG | 32601 - 23760 | WGS 1984 UTM Zones |
| ESRI | 54001 - 54004 54008 - 54019 54021 - 54032 54034 54042 - 54046 54048 - 54053 |
Various world projection systems |
The false origin and scale values for the system are derived from the Projected Bounds of the underlying Coordinate System. For example, EPSG 2193 (NZGD_2000_New_Zealand_Transverse_Mercator) derives the falsex, falsey and xyunits values based on the extent of the projection system:
- falsex = -6020520.00000
- falsey = -1997720.00000
- xyunits = 375371289.4930
The z and m coordinates for all predefined spatial reference systems have the following values in the following columns:
- falsez = -50000.0
- zunits = 1000.0
- falsem = -1000.0
- munits = 1000.0