## raster.get_epsg_string()


Extract CRS identifier string from CRS object.


Usage

``` python
raster.get_epsg_string(projparams)
```


## Parameters


`projparams: Any`  
An object that can initialize a pyproj.CRS class instance, e.g., a EPSG code or any object that implements `to_wkt()`.


## Returns


`str`  
'EPSG:' + EPSG code identifier (e.g., 'EPSG:4326')


## Raises


`ValueError`  
If EPSG code cannot be extracted.