EPSG:27493 Datum 73 / Modified Portuguese Grid
Projected system (Transverse Mercator) in use: Portugal - mainland - onshore. The full definition below, and conversion in one click.
| Code | EPSG:27493 |
|---|---|
| Name | Datum 73 / Modified Portuguese 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 | Datum 73 |
| Ellipsoid | International 1924 a = 6378388 m · 1/f = 297 |
| Base geographic system | EPSG:4274 — Datum 73 |
| Unit | metre (X east, Y north) |
| Transformation to WGS 84 | Datum 73 to WGS 84 (4) (EPSG:1987) — accuracy 1 m |
| Scope | Engineering survey, topographic mapping. |
Projection parameters
| Parameter | Value | Unit |
|---|---|---|
| Latitude of natural origin | 39.666666666666664 | degree |
| Longitude of natural origin | -8.131906111111112 | degree |
| Scale factor at natural origin | 1 | unity |
| False easting | 180.598 | metre |
| False northing | -86.99 | metre |
proj4 definition
+proj=tmerc +lat_0=39.6666666666667 +lon_0=-8.13190611111111 +k=1 +x_0=180.598 +y_0=-86.99 +ellps=intl +units=m +towgs84=-239.749,88.181,30.488,0.263,0.082,1.211,2.229 +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:27493.
WKT (ESRI format, the .prj content)
PROJCS["Datum_73_Modified_Portuguese_Grid",GEOGCS["GCS_Datum_73",DATUM["D_Datum_73",SPHEROID["International_1924",6378388.0,297.0]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",180.598],PARAMETER["False_Northing",-86.99],PARAMETER["Central_Meridian",-8.13190611111111],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:20790Lisbon (Lisbon) / Portuguese National Grid
- EPSG:20791Lisbon (Lisbon) / Portuguese Grid
- EPSG:27429Datum 73 / UTM zone 29N
Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.