Convert coordinates from KSA-GRF17 (EPSG:9332) to KSA-GRF17 + KSA-VRF14 height (EPSG:9520) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.
The EPSG Geodetic Parameter Dataset defines 2 transformations between KSA-GRF17 (EPSG:9332) and KSA-GRF17 + KSA-VRF14 height (EPSG:9520). Each applies to a specific area — pick the one whose area of use covers your data.
Grid file: KSA-GEOID21.gra
Reversible alternative to KSA-GRF17 to KSA-VRF14 height (2) (code 10775). Hybrid geoid, replaces KSA-Geoid17. Accuracy 1.5 cm along levelling lines, 2.5 cm between lines. To access KSA-GEOID21 contact GEOSA at info@geosa.gov.sa
Grid file: KSA-GEOID17.gra
Reversible alternative to KSA-GRF17 to KSA-VRF14 height (1) (code 9355). File also available in IGN2009 format. To access KSA-GEOID17 contact GCS by email to info@gcs.gov.sa
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:9332", "EPSG:9520", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)geographic system using latitude, longitude and ellipsoidal height · Area of use: Saudi Arabia
+proj=longlat +ellps=GRS80 +towgs84=0,0,0,-0.008393,0.000749,-0.010276,0 +no_defs +type=crsMore about EPSG:9332 →
compound horizontal + vertical reference system · Area of use: Saudi Arabia - onshore
+proj=longlat +ellps=GRS80 +towgs84=0,0,0,-0.008393,0.000749,-0.010276,0 +vunits=m +no_defs +type=crsMore about EPSG:9520 →