EPSG:CODE

ITRF90 to ITRF91 (1)

EPSG:4912 → EPSG:4913

Coordinate Reference Systems

Source CRS
EPSG:4912
ITRF90
Geocentric
Target CRS
EPSG:4913
ITRF91
Geocentric

Transform Coordinates

Remarks

Scale difference in ppb and scale difference rate in ppb/yr where 1/billion = 1E-9 or nm/m. Superseded by parameter values derived from transformations to ITRF2020 (change in tX), see EPSG:10141.

Frequently Asked Questions

How do I convert ITRF90 to ITRF91 coordinates?

Use the coordinate transformation tool above to convert ITRF90 (EPSG:4912) to ITRF91 (EPSG:4913). Enter your source coordinates and click Transform. This uses the Position Vector transformation (geocentric domain) method with 0.007m accuracy.

How do I transform ITRF90 to ITRF91 using Proj4js?

Use proj4.defs to define both EPSG:4912 and EPSG:4913, then call proj4(source, target, [x, y]) to convert coordinates programmatically.

What is the accuracy of the ITRF90 to ITRF91 transformation?

This transformation (EPSG:9022) has an accuracy of 0.007m using the Position Vector transformation (geocentric domain) method. Area of use: World.