Source: EPSG:4267 — NAD27
geographic system using latitude and longitude on an ellipsoid · Area of use: North America - NAD27
+proj=longlat +datum=NAD27 +no_defs +type=crsMore about EPSG:4267 →
Convert EPSG:4267 to EPSG:4637
Online coordinate converter from NAD27 (EPSG:4267) to Perroud 1950 (EPSG:4637). Enter your source coordinates and get the result instantly. All transformations happen in your browser — no data is sent to any server.
Convert EPSG:4267 to EPSG:4637 in code
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4267", "EPSG:4637", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)Target: EPSG:4637 — Perroud 1950
geographic system using latitude and longitude on an ellipsoid · Area of use: Antarctica - Adelie Land coastal area
+proj=longlat +ellps=intl +towgs84=325,154,172,0,0,0,0 +no_defs +type=crsMore about EPSG:4637 →
Frequently asked questions
- How accurate is converting NAD27 to Perroud 1950?
- 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.