Source: EPSG:4269 — NAD83
geographic system using latitude and longitude on an ellipsoid · Area of use: North America - NAD83
+proj=longlat +datum=NAD83 +no_defs +type=crsMore about EPSG:4269 →
Convert EPSG:4269 to EPSG:20791
Online coordinate converter from NAD83 (EPSG:4269) to Lisbon (Lisbon) / Portuguese Grid (EPSG:20791). Enter your source coordinates and get the result instantly. All transformations happen in your browser — no data is sent to any server.
Convert EPSG:4269 to EPSG:20791 in code
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4269", "EPSG:20791", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)Target: EPSG:20791 — Lisbon (Lisbon) / Portuguese Grid
projected system measured in linear units (typically metres) · Area of use: Portugal - mainland - onshore
+proj=tmerc +lat_0=39.6666666666667 +lon_0=1 +k=1 +x_0=0 +y_0=0 +ellps=intl +pm=lisbon +towgs84=-288.885,-91.744,126.244,-1.691,0.41,-0.211,-4.598 +units=m +no_defs +type=crsMore about EPSG:20791 →
Frequently asked questions
- How accurate is converting NAD83 to Lisbon (Lisbon) / Portuguese Grid?
- 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.