EPSG:22991 Egypt 1907 / Blue Belt
Projected system (Transverse Mercator) in use: Egypt - east of 33°E onshore. The full definition below, and conversion in one click.
| Code | EPSG:22991 |
|---|---|
| Name | Egypt 1907 / Blue Belt |
| Type | Projected system — Transverse Mercator |
| Area of use |
Egypt - east of 33°E onshore Egypt - east of 33°E - onshore plus offshore Gulf of Suez. |
| Bounds | W 33,00° · S 21,97° · E 36,95° · N 31,36° |
| Countries | Egypt |
| Datum | Egypt 1907 |
| Ellipsoid | Helmert 1906 a = 6378200 m · 1/f = 298.3 |
| Base geographic system | EPSG:4229 — Egypt 1907 |
| Unit | metre (E east, N north) |
| Transformation to WGS 84 | Egypt 1907 to WGS 84 (1) (EPSG:1148) — accuracy 11 m |
| Scope | Military survey. |
Projection parameters
| Parameter | Value | Unit |
|---|---|---|
| Latitude of natural origin | 30 | degree |
| Longitude of natural origin | 35 | degree |
| Scale factor at natural origin | 1 | unity |
| False easting | 300000 | metre |
| False northing | 1100000 | metre |
proj4 definition
+proj=tmerc +lat_0=30 +lon_0=35 +k=1 +x_0=300000 +y_0=1100000 +ellps=helmert +units=m +towgs84=-130,110,-13 +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:22991.
WKT (ESRI format, the .prj content)
PROJCS["Egypt_Blue_Belt",GEOGCS["GCS_Egypt_1907",DATUM["D_Egypt_1907",SPHEROID["Helmert_1906",6378200.0,298.3]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",300000.0],PARAMETER["False_Northing",1100000.0],PARAMETER["Central_Meridian",35.0],PARAMETER["Scale_Factor",1.0],PARAMETER["Latitude_Of_Origin",30.0],UNIT["Meter",1.0]]Other systems — Egypt
Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.