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# RS_SRID
Introduction: Returns the spatial reference system identifier (SRID) of the raster geometry. Returns 0 if the raster has no CRS defined or if the CRS is a custom (non-EPSG) coordinate reference system. To retrieve the full CRS definition for custom CRS, use [RS_CRS](RS_CRS.md).
Format: `RS_SRID (raster: Raster)`
Return type: `Integer`
Since: `v1.4.1`
SQL Example
```sql
SELECT RS_SRID(raster) FROM raster_table
```
Output:
```
3857
```