geointel/docs/18-ultra-prep/CRS_POLICY.md

CRS Policy

API Boundary

GeoJSON in API responses should be EPSG:4326.

Analytical Operations

For Belgium/Kempen projected calculations, use EPSG:31370 where possible.

Raster Operations

Raster operations must preserve source CRS unless a reproject operation is explicitly requested.

Required Metadata

Every dataset must store:

• source CRS;
• normalized CRS string;
• bounds in source CRS;
• bounds in EPSG:4326;
• transform/affine for rasters where available.

Unsupported Cases

If CRS cannot be determined:

• dataset can be stored as metadata_failed or requires_crs;
• processing requiring geospatial alignment must be blocked;
• UI must ask for CRS or show limitation.