8. Appendix: Built-in EPSG Transformation Database

SurveyTools ships with a curated SQLite database of 34 common geodetic transformations. These are the most frequently used 7-parameter (Helmert) datum transformations in surveying and mapping. The database file is located at data/epsg_transformations.db.

Each entry stores:

• EPSG Code — the official EPSG operation code for the transformation

• Name — official EPSG name

• Source CRS — EPSG code of the source coordinate reference system

• Target CRS — EPSG code of the target CRS (usually WGS 84 = 4326)

• Method — EPSG method code: 9603 (Geocentric Translation), 9606 (Position Vector), or 9607 (Coordinate Frame)

• Accuracy — stated accuracy in metres

• Parameters — Tx, Ty, Tz (metres), Rx, Ry, Rz (arc-seconds), ds (ppm)

Note

Method 9603 (Geocentric Translation) is a simplified 3-parameter transformation where all rotation and scale values are zero. It uses only translations (Tx, Ty, Tz). In SurveyTools, this loads as a 7-parameter set with Rx=Ry=Rz=0 and ds=0.

8.1. Complete Transformation List

8.1.1. Australia

Code	Name	Method	Accuracy	Parameters
1150	AGD66 to WGS 84 (11)	9603	5.0 m	Tx=-117.808, Ty=-51.536, Tz=137.784
1461	AGD84 to WGS 84 (7)	9603	3.0 m	Tx=-116.0, Ty=-50.47, Tz=141.69
1559	GDA94 to WGS 84 (1)	9603	1.0 m	Tx=0, Ty=0, Tz=0 (identity)

8.1.2. Austria

Code	Name	Method	Accuracy	Parameters
1618	MGI to WGS 84 (4)	9607	1.5 m	Tx=577.326, Ty=90.129, Tz=463.919, Rx=5.137”, Ry=1.474”, Rz=5.297”, ds=2.4232 ppm

8.1.3. China

Code	Name	Method	Accuracy	Parameters
15934	Beijing 1954 to WGS 84 (1)	9603	25.0 m	Tx=15.8, Ty=-154.4, Tz=-82.3

8.1.4. Cyprus

Code	Name	Method	Accuracy	Parameters
6907	ED50 to WGS 84 (29)	9603	1.0 m	Tx=-104.0, Ty=-101.0, Tz=-140.0

8.1.5. Egypt

Code	Name	Method	Accuracy	Parameters
1074	Egypt 1907 to WGS 84 (1)	9603	5.0 m	Tx=-130.0, Ty=110.0, Tz=-13.0

8.1.6. Europe

Code	Name	Method	Accuracy	Parameters
1133	ED50 to WGS 84 (18)	9603	2.5 m	Tx=-84.0, Ty=-97.0, Tz=-117.0
1149	ED50 to WGS 84 (23)	9606	2.0 m	Tx=-87.0, Ty=-98.0, Tz=-121.0
101149	ETRS89 to WGS 84 (1)	9603	0.5 m	Tx=0, Ty=0, Tz=0 (identity)

8.1.7. France

Code	Name	Method	Accuracy	Parameters
15929	ED50 to WGS 84 (41)	9606	1.0 m	Tx=-84.0, Ty=-97.0, Tz=-117.0

8.1.8. Germany

Code	Name	Method	Accuracy	Parameters
1776	DHDN to WGS 84 (3)	9606	3.0 m	Tx=598.1, Ty=73.7, Tz=418.2, Rx=0.202”, Ry=0.045”, Rz=-2.455”, ds=6.7 ppm
15869	DHDN to ETRS89 (8)	9607	1.0 m	Tx=582.0, Ty=105.0, Tz=414.0, Rx=-1.04”, Ry=-0.35”, Rz=3.08”, ds=8.3 ppm
1612	ED50 to WGS 84 (32)	9606	1.0 m	Tx=-111.92, Ty=-87.85, Tz=-114.5

8.1.9. Greece

Code	Name	Method	Accuracy	Parameters
1272	GGRS87 to WGS 84 (1)	9603	1.0 m	Tx=199.87, Ty=74.79, Tz=246.62

8.1.10. Ireland

Code	Name	Method	Accuracy	Parameters
1954	TM65 to WGS 84 (2)	9606	1.0 m	Tx=482.53, Ty=-130.596, Tz=564.557, Rx=-1.042”, Ry=-0.214”, Rz=-0.631”, ds=-8.15 ppm

8.1.11. Italy

Code	Name	Method	Accuracy	Parameters
1660	Monte Mario to WGS 84 (2)	9606	5.0 m	Tx=-104.1, Ty=-49.1, Tz=-9.9, Rx=0.971”, Ry=-2.917”, Rz=0.714”, ds=-11.68 ppm

8.1.12. Japan

Code	Name	Method	Accuracy	Parameters
1826	Tokyo to WGS 84 (3)	9603	12.0 m	Tx=-148.0, Ty=507.0, Tz=685.0

8.1.13. New Zealand

Code	Name	Method	Accuracy	Parameters
1564	NZGD49 to WGS 84 (3)	9603	5.0 m	Tx=59.47, Ty=-5.04, Tz=187.44

8.1.14. North America

Code	Name	Method	Accuracy	Parameters
1188	NAD27 to WGS 84 (4)	9603	10.0 m	Tx=-8.0, Ty=160.0, Tz=176.0
1580	NAD83 to WGS 84 (1)	9603	2.0 m	Tx=0, Ty=0, Tz=0 (identity)

8.1.15. Portugal

Code	Name	Method	Accuracy	Parameters
1988	Datum 73 to WGS 84 (2)	9603	2.0 m	Tx=-223.237, Ty=110.193, Tz=36.649

8.1.16. Russia

Code	Name	Method	Accuracy	Parameters
1267	Pulkovo 1942 to WGS 84 (1)	9603	5.0 m	Tx=28.0, Ty=-130.0, Tz=-95.0

8.1.17. South Africa

Code	Name	Method	Accuracy	Parameters
1226	Hartebeesthoek94 to WGS 84 (1)	9603	1.0 m	Tx=0, Ty=0, Tz=0 (identity)
1505	Cape to WGS 84 (2)	9603	1.0 m	Tx=-136.0, Ty=-108.0, Tz=-292.0

8.1.18. South America

Code	Name	Method	Accuracy	Parameters
1071	SAD69 to WGS 84 (1)	9603	15.0 m	Tx=-57.0, Ty=1.0, Tz=-41.0

8.1.19. Spain

Code	Name	Method	Accuracy	Parameters
1311	ED50 to WGS 84 (14)	9606	1.0 m	Tx=-131.032, Ty=-100.251, Tz=-163.354, Rx=-1.244”, Ry=-0.02”, Rz=-1.144”, ds=9.39 ppm

8.1.20. Sweden

Code	Name	Method	Accuracy	Parameters
1896	RT90 to WGS 84 (1)	9607	10.0 m	Tx=414.1, Ty=41.3, Tz=603.1, Rx=-0.855”, Ry=2.141”, Rz=7.023”

8.1.21. Switzerland

Code	Name	Method	Accuracy	Parameters
1753	CH1903 to WGS 84 (1)	9603	1.5 m	Tx=674.374, Ty=15.056, Tz=405.346
1676	CH1903+ to WGS 84 (1)	9603	1.0 m	Tx=674.374, Ty=15.056, Tz=405.346

8.1.22. Thailand

Code	Name	Method	Accuracy	Parameters
1152	Indian 1975 to WGS 84 (2)	9603	3.0 m	Tx=209.0, Ty=818.0, Tz=290.0

8.1.23. Turkey

Code	Name	Method	Accuracy	Parameters
1027	ED50 to WGS 84 (1)	9603	10.0 m	Tx=-84.0, Ty=-97.0, Tz=-117.0

8.1.24. United Kingdom

Code	Name	Method	Accuracy	Parameters
1314	OSGB 1936 to WGS 84 (6)	9606	5.0 m	Tx=446.448, Ty=-125.157, Tz=542.06, Rx=0.15”, Ry=0.247”, Rz=0.842”, ds=-20.489 ppm

8.1.25. World

Code	Name	Method	Accuracy	Parameters
1238	WGS 72 to WGS 84 (2)	9606	2.0 m	Tx=0, Ty=0, Tz=4.5, Rz=0.554”, ds=0.2263 ppm

8.2. Adding Custom Transformations

If your transformation is not in the built-in database, you have several options:

1. Manual entry via CSV: Create a CSV file with your parameters and import it

2. PROJ string: If you have the PROJ definition from your GIS software, paste the +towgs84= string directly

3. WKT from .prj file: Open the .prj file that accompanies your shapefile and paste the TOWGS84[...] block

4. Leica TRF file: If you have a Leica instrument coordinate system file, import it directly

5. Online EPSG lookup: If the code is not in the local database, SurveyTools will attempt an online lookup via epsg.io

To add a transformation permanently to the local database, run the build_epsg_db.py script (in scr/transformations/tools/) after adding the transformation to the TRANSFORMATIONS list in the script.