Lisbon 1890 (Lisbon) to Lisbon 1890 (1)
EPSG:1991±0 m- Method:
- Longitude rotation
- Area of use:
- Portugal - mainland - onshore
- Scope:
- Change of prime meridian.
| Parameter | Value | Unit |
|---|---|---|
| Longitude offset | -9.0754862 | sexagesimal DMS |
Convert Lisbon 1890 (Lisbon) to Lisbon 1890
Convert coordinates from Lisbon 1890 (Lisbon) (EPSG:4904) to Lisbon 1890 (EPSG:4666) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.
Official EPSG transformation from Lisbon 1890 (Lisbon) to Lisbon 1890
The EPSG Geodetic Parameter Dataset defines 1 transformation between Lisbon 1890 (Lisbon) (EPSG:4904) and Lisbon 1890 (EPSG:4666). Its parameters, accuracy and area of use are listed below.
Convert EPSG:4904 to EPSG:4666 in code
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4904", "EPSG:4666", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)Source: EPSG:4904 — Lisbon 1890 (Lisbon)
geographic system using latitude and longitude on an ellipsoid · Area of use: Portugal - mainland - onshore
+proj=longlat +ellps=bessel +pm=lisbon +no_defs +type=crsMore about EPSG:4904 →
Target: EPSG:4666 — Lisbon 1890
geographic system using latitude and longitude on an ellipsoid · Area of use: Portugal - mainland - onshore
+proj=longlat +ellps=bessel +no_defs +type=crsMore about EPSG:4666 →
Frequently asked questions
- How accurate is converting Lisbon 1890 (Lisbon) to Lisbon 1890?
- The most accurate official EPSG transformation between these systems is accurate to about ±0 m within its stated area of use. Browser-based converters approximate datum shifts with Helmert parameters; for surveying-grade work apply the official 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.