EPSG:CODE

ETRS89-FRA [RGF93 v1] to ETRS89-FRA [RGF93 v2] (1)

EPSG:4171 → EPSG:9777

Coordinate Reference Systems

Source CRS
EPSG:4171
ETRS89-FRA [RGF93 v1]
Geographic 2D
Target CRS
EPSG:9777
ETRS89-FRA [RGF93 v2]
Geographic 2D

Transform Coordinates

Remarks

Maximum differences are 0.1m in both horizontal and vertical. Distortions in ETRS89-FRA [RGF93 v1] are irregular and IGN considers that no systematic transformation to the improved v2 adjustment is possible.

Frequently Asked Questions

How do I convert ETRS89-FRA [RGF93 v1] to ETRS89-FRA [RGF93 v2] coordinates?

Use the coordinate transformation tool above to convert ETRS89-FRA [RGF93 v1] (EPSG:4171) to ETRS89-FRA [RGF93 v2] (EPSG:9777). Enter your source coordinates and click Transform. This uses the Geocentric translations (geog2D domain) method with 0.05m accuracy.

How do I transform ETRS89-FRA [RGF93 v1] to ETRS89-FRA [RGF93 v2] using Proj4js?

Use proj4.defs to define both EPSG:4171 and EPSG:9777, then call proj4(source, target, [x, y]) to convert coordinates programmatically.

What is the accuracy of the ETRS89-FRA [RGF93 v1] to ETRS89-FRA [RGF93 v2] transformation?

This transformation (EPSG:9882) has an accuracy of 0.05m using the Geocentric translations (geog2D domain) method. Area of use: France.