Coordinate Reference Systems
Transform Coordinates
Remarks
Parameter values from RT90 to ETRS89 (1) (code 1787) assuming that ETRS89 is equivalent to WGS 84 within the accuracy of the transformation. Supersedes RT90 to WGS 84 (1) (code 1680).
Frequently Asked Questions
How do I convert RT90 to WGS 84 coordinates?
Use the coordinate transformation tool above to convert RT90 (EPSG:4124) to WGS 84 (EPSG:4326). Enter your source coordinates and click Transform. This uses the Coordinate Frame rotation (geog2D domain) method.
How do I transform RT90 to WGS 84 using Proj4js?
Use proj4.defs to define both EPSG:4124 and EPSG:4326, then call proj4(source, target, [x, y]) to convert coordinates programmatically.