EPSG:20790 Lisbon (Lisbon) / Portuguese National Grid
Projected system (Transverse Mercator) in use: Portugal - mainland - onshore. The full definition below, and conversion in one click.
EPSG publishes no simple transformation to WGS 84 for this datum: conversion works on the ellipsoid alone and can be off by tens of metres.
| Code | EPSG:20790 |
|---|---|
| Name | Lisbon (Lisbon) / Portuguese National Grid |
| Type | Projected system — Transverse Mercator |
| Area of use | Portugal - mainland - onshore |
| Bounds | W -9,56° · S 36,95° · E -6,19° · N 42,16° |
| Countries | Portugal |
| Datum | Lisbon 1937 (Lisbon) |
| Ellipsoid | International 1924 a = 6378388 m · 1/f = 297 |
| Prime meridian | Lisbon -9.131906111111112 degree |
| Base geographic system | EPSG:4803 — Lisbon (Lisbon) |
| Unit | metre (X east, Y north) |
| Transformation to WGS 84 | No simple transformation published (ellipsoid alone) |
| Scope | Military survey. |
Projection parameters
| Parameter | Value | Unit |
|---|---|---|
| Latitude of natural origin | 39.666666666666664 | degree |
| Longitude of natural origin | 1 | degree |
| Scale factor at natural origin | 1 | unity |
| False easting | 200000 | metre |
| False northing | 300000 | metre |
proj4 definition
+proj=tmerc +lat_0=39.6666666666667 +lon_0=1 +k=1 +x_0=200000 +y_0=300000 +ellps=intl +pm=lisbon +units=m +no_defsPaste it into QGIS, proj4js, PostGIS (spatial_ref_sys) or GDAL. +towgs84 carries the EPSG transformation to WGS 84; the official code stays EPSG:20790.
WKT (ESRI format, the .prj content)
PROJCS["Portuguese_National_Grid",GEOGCS["GCS_Lisbon_Lisbon",DATUM["Lisbon_1937_(Lisbon)",SPHEROID["International_1924",6378388.0,297.0]],PRIMEM["Lisbon",-9.13190611111111],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",200000.0],PARAMETER["False_Northing",300000.0],PARAMETER["Central_Meridian",1.0],PARAMETER["Scale_Factor",1.0],PARAMETER["Latitude_Of_Origin",39.6666666666667],UNIT["Meter",1.0]]Other systems — Portugal
- EPSG:4616Selvagem Grande
- EPSG:4663Porto Santo 1995
- EPSG:4664Azores Oriental 1995
- EPSG:4665Azores Central 1995
- EPSG:4666Lisbon 1890
- EPSG:4803Lisbon (Lisbon)
- EPSG:4904Lisbon 1890 (Lisbon)
- EPSG:5013PTRA08
- EPSG:5014PTRA08 / UTM zone 25N
- EPSG:5015PTRA08 / UTM zone 26N
- EPSG:5016PTRA08 / UTM zone 28N
- EPSG:5017Lisbon 1890 / Portugal Bonne New
- EPSG:5018Lisbon / Portuguese Grid New
- EPSG:5632PTRA08 / LCC Europe
- EPSG:5633PTRA08 / LAEA Europe
- EPSG:20791Lisbon (Lisbon) / Portuguese Grid
- EPSG:27429Datum 73 / UTM zone 29N
- EPSG:27493Datum 73 / Modified Portuguese Grid
Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.