Source: EPSG:9725 — ETRS89 + Cagliari 1956 height
compound horizontal + vertical reference system · Area of use: Italy - Sardinia onshore
+proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +vunits=m +no_defs +type=crsMore about EPSG:9725 →
Convert EPSG:9725 to EPSG:4937
Online coordinate converter from ETRS89 + Cagliari 1956 height (EPSG:9725) to ETRS89 (EPSG:4937). 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 ETRS89 to ETRS89 + Cagliari 1956 height — the parameters are invertible.
Convert EPSG:9725 to EPSG:4937 in code
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:9725", "EPSG:4937", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)Target: EPSG:4937 — ETRS89
geographic system using latitude, longitude and ellipsoidal height · Area of use: Europe - ETRF by country
+proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs +type=crsMore about EPSG:4937 →
Frequently asked questions
- How accurate is converting ETRS89 + Cagliari 1956 height to ETRS89?
- 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.