Saudi geodetic reference

SANSRS is Saudi Arabia's national spatial reference system. KSA-GRF17 is its geodetic reference frame. A datum/reference frame, a coordinate reference system (CRS), and a map projection are distinct concepts. UTM is a projection system, not a positional-accuracy guarantee.

These are different from WGS 84 / UTM codes (32636–32640). KSA-GRF17 geographic 2D is EPSG:9333. Coordinate transformation between reference frames requires a documented operation and may depend on the coordinate epoch; changing an EPSG label alone is not a transformation.

Ellipsoidal height (h) is measured relative to an ellipsoid; orthometric height (H) is relative to a gravity-related vertical datum. A suitable geoid model is required to convert between them (commonly H ≈ h − N with consistent definitions). Saudi vertical references include KSA-VRF14 and the KSA-GEOID21 model.

Official sources: GEOSA SANSRS Guidelines · GEOSA FAQ · GEOSA Transformation Tool.

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