Source: EPSG:4903 — Madrid 1870 (Madrid)
geographic system using latitude and longitude on an ellipsoid · Area of use: Spain - mainland onshore
+proj=longlat +a=6378298.3 +rf=294.73 +pm=-3.687375 +no_defs +type=crsMore about EPSG:4903 →
Convert EPSG:4903 to EPSG:6318
Online coordinate converter from Madrid 1870 (Madrid) (EPSG:4903) to NAD83(2011) (EPSG:6318). Enter your source coordinates and get the result instantly. All transformations happen in your browser — no data is sent to any server.
Convert EPSG:4903 to EPSG:6318 in code
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4903", "EPSG:6318", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)Target: EPSG:6318 — NAD83(2011)
geographic system using latitude and longitude on an ellipsoid · Area of use: USA - CONUS and Alaska; PRVI
+proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs +type=crsMore about EPSG:6318 →
Frequently asked questions
- How accurate is converting Madrid 1870 (Madrid) to NAD83(2011)?
- 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.