Source: EPSG:4821 — Voirol 1879 (Paris)
geographic system using latitude and longitude on an ellipsoid · Area of use: Algeria - north of 32°N
+proj=longlat +ellps=clrk80ign +pm=paris +no_defs +type=crsMore about EPSG:4821 →
Convert EPSG:4821 to EPSG:7789
Online coordinate converter from Voirol 1879 (Paris) (EPSG:4821) to ITRF2014 (EPSG:7789). Enter your source coordinates and get the result instantly. All transformations happen in your browser — no data is sent to any server.
Convert EPSG:4821 to EPSG:7789 in code
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4821", "EPSG:7789", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)Target: EPSG:7789 — ITRF2014
geocentric Cartesian system (Earth-centred Earth-fixed) · Area of use: World
+proj=geocent +ellps=GRS80 +units=m +no_defs +type=crsMore about EPSG:7789 →
Frequently asked questions
- How accurate is converting Voirol 1879 (Paris) to ITRF2014?
- 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.