Source: EPSG:4913 — ITRF91
geocentric Cartesian system (Earth-centred Earth-fixed) · Area of use: World
+proj=geocent +ellps=GRS80 +units=m +no_defs +type=crsMore about EPSG:4913 →
Convert EPSG:4913 to EPSG:4912
Online coordinate converter from ITRF91 (EPSG:4913) to ITRF90 (EPSG:4912). Enter your source coordinates and get the result instantly. All transformations happen in your browser — no data is sent to any server.
The EPSG dataset defines official transformation parameters for the reverse direction. See ITRF90 to ITRF91 — the parameters are invertible.
Convert EPSG:4913 to EPSG:4912 in code
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4913", "EPSG:4912", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)Target: EPSG:4912 — ITRF90
geocentric Cartesian system (Earth-centred Earth-fixed) · Area of use: World
+proj=geocent +ellps=GRS80 +units=m +no_defs +type=crsMore about EPSG:4912 →
Frequently asked questions
- How accurate is converting ITRF91 to ITRF90?
- Projection-only conversions are accurate to floating-point precision. If a datum shift is involved, browser-based tools use Helmert parameters which are accurate to roughly 1-5 m; for surveying-grade work apply the official grid-shift transformation in a desktop GIS.
- Does my data leave the browser when I use this converter?
- No. All coordinate transformations are computed locally in your browser using proj4js. The coordinates you enter are never transmitted to any server.