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:4431
Online coordinate converter from NAD83 (EPSG:4269) to NAD83 / BLM 11N (ftUS) (EPSG:4431). 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:4431 in code
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4269", "EPSG:4431", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)Target: EPSG:4431 — NAD83 / BLM 11N (ftUS)
projected system measured in linear units (typically metres) · Area of use: USA - 120°W to 114°W
+proj=tmerc +lat_0=0 +lon_0=-117 +k=0.9996 +x_0=500000.001016002 +y_0=0 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=us-ft +no_defs +type=crsMore about EPSG:4431 →
Frequently asked questions
- How accurate is converting NAD83 to NAD83 / BLM 11N (ftUS)?
- 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.