Name | Equirectangular |
Alias | Plate Caree |
Alias | Equidistant Cylindrical |
Alias | Simple Cylindrical |
EPSG Code | 9823 (spherical), 9842 (elliptical) |
GeoTIFF Code | CT_Equirectangular (17) |
OGC WKT Name | Equirectangular |
Supported By | GeoTIFF, PROJ.4, OGC WKT |
Name | EPSG # | GeoTIFF ID | OGC(OGR) WKT | ESRI PE WKT | PROJ.4 | Units |
---|---|---|---|---|---|---|
Latitude of true scale | 3 | ProjStdParallel1 | standard_parallel_1 | Standard_Parallel_1 | +lat_ts | Angular |
Latitude of origin | 1 (8801) | ProjCenterLat | latitude_of_origin | (unavailable) | +lat_0 | Angular |
Longitude of projection center | 2 (8802/8822) | ProjCenterLong | central_meridian | Central_Meridian | +lon_0 | Angular |
False Easting | 6 | FalseEasting | false_easting | False_Easting | +x_0 | Linear |
False Northing | 7 | FalseNorthing | false_northing | False_Northing | +y_0 | Linear |
Generally speaking, if you only have one of these latitudes provided, it is likely the latitude of true scale.
For a period OGR used the name "latitude_of_origin" for the latitude of true scale, in error resulting in much confusion.
Most libraries only implement the spherical version this projection. The rules for deriving a spherical radius from the ellipsoid defined for a coordinate system vary between libraries, causing some confusion and mixed results.
Plate Caree is an alias, but generally implies that the latitude of true scale, and latitude of natural origin are zero. Simple Cylindrical is also an alias with the same assumptions.