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Unit: metre
Geodetic CRS: WGS 84
Datum: World Geodetic System 1984 ensemble
Data source: EPSG
Information source: "Optimisation of global grids for high-resolution remote sensing data", Bernhard Bauer-Marschallinger, Vienna University of Technology (TU Wien).
Revision date: 2024-01-04
Scope: Continental mapping of raster data.
Remarks: Basis for the Equi7 grid for Africa. Designed in 2014 to efficiently handle the archiving, processing, and displaying of high resolution raster data over land while preserving geometric accuracy. Neither conformal nor equal area.
Area of use: Africa and the Arabian peninsula.
Coordinate system: Cartesian 2D CS. Axes: easting, northing (E,N). Orientations: east, north. UoM: m.
&stroke=red&width=2&path=-43.89,-31.68|38.8,-31.68|38.8,79.3|-43.89,79.3|-43.89,-31.68)
Center coordinates
5879935.22 4769713.02
Projected bounds:
-327158.23 -337225.81
12086560.76 10275625.58
WGS84 bounds:
-31.68 -43.89
79.3 38.8
Definition: OGC Well Known Text
PROJCS["WGS 84 / Equi7 Africa", GEOGCS["WGS 84", DATUM["WGS_1984", SPHEROID["WGS 84",6378137,298.257223563, AUTHORITY["EPSG","7030"]], AUTHORITY["EPSG","6326"]], PRIMEM["Greenwich",0, AUTHORITY["EPSG","8901"]], UNIT["degree",0.0174532925199433, AUTHORITY["EPSG","9122"]], AUTHORITY["EPSG","4326"]], PROJECTION["Azimuthal_Equidistant"], PARAMETER["latitude_of_center",8.5], PARAMETER["longitude_of_center",21.5], PARAMETER["false_easting",5621452.02], PARAMETER["false_northing",5990638.423], UNIT["metre",1, AUTHORITY["EPSG","9001"]], AXIS["Easting",EAST], AXIS["Northing",NORTH], AUTHORITY["EPSG","27701"]]
Definition: OGC Well Known Text 2 (2019)
PROJCRS["WGS 84 / Equi7 Africa", BASEGEOGCRS["WGS 84", ENSEMBLE["World Geodetic System 1984 ensemble", MEMBER["World Geodetic System 1984 (Transit)"], MEMBER["World Geodetic System 1984 (G730)"], MEMBER["World Geodetic System 1984 (G873)"], MEMBER["World Geodetic System 1984 (G1150)"], MEMBER["World Geodetic System 1984 (G1674)"], MEMBER["World Geodetic System 1984 (G1762)"], MEMBER["World Geodetic System 1984 (G2139)"], MEMBER["World Geodetic System 1984 (G2296)"], ELLIPSOID["WGS 84",6378137,298.257223563, LENGTHUNIT["metre",1]], ENSEMBLEACCURACY[2.0]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433]], ID["EPSG",4326]], CONVERSION["Equi7 projection - Africa", METHOD["Azimuthal Equidistant", ID["EPSG",1125]], PARAMETER["Latitude of natural origin",8.5, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8801]], PARAMETER["Longitude of natural origin",21.5, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8802]], PARAMETER["False easting",5621452.02, LENGTHUNIT["metre",1], ID["EPSG",8806]], PARAMETER["False northing",5990638.423, LENGTHUNIT["metre",1], ID["EPSG",8807]]], CS[Cartesian,2], AXIS["(E)",east, ORDER[1], LENGTHUNIT["metre",1]], AXIS["(N)",north, ORDER[2], LENGTHUNIT["metre",1]], USAGE[ SCOPE["Continental mapping of raster data."], AREA["Africa and the Arabian peninsula."], BBOX[-43.89,-31.68,38.8,79.3]], ID["EPSG",27701]]
Definition: ESRI Well Known Text
PROJCS["WGS_1984_Equi7_Africa", GEOGCS["GCS_WGS_1984", DATUM["D_WGS_1984", SPHEROID["WGS_1984",6378137.0,298.257223563]], PRIMEM["Greenwich",0.0], UNIT["Degree",0.0174532925199433]], PROJECTION["Azimuthal_Equidistant"], PARAMETER["False_Easting",5621452.02], PARAMETER["False_Northing",5990638.423], PARAMETER["Central_Meridian",21.5], PARAMETER["Latitude_Of_Origin",8.5], UNIT["Meter",1.0]]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "ProjectedCRS", "name": "WGS 84 / Equi7 Africa", "base_crs": { "name": "WGS 84", "datum_ensemble": { "name": "World Geodetic System 1984 ensemble", "members": [ { "name": "World Geodetic System 1984 (Transit)", "id": { "authority": "EPSG", "code": 1166 } }, { "name": "World Geodetic System 1984 (G730)", "id": { "authority": "EPSG", "code": 1152 } }, { "name": "World Geodetic System 1984 (G873)", "id": { "authority": "EPSG", "code": 1153 } }, { "name": "World Geodetic System 1984 (G1150)", "id": { "authority": "EPSG", "code": 1154 } }, { "name": "World Geodetic System 1984 (G1674)", "id": { "authority": "EPSG", "code": 1155 } }, { "name": "World Geodetic System 1984 (G1762)", "id": { "authority": "EPSG", "code": 1156 } }, { "name": "World Geodetic System 1984 (G2139)", "id": { "authority": "EPSG", "code": 1309 } }, { "name": "World Geodetic System 1984 (G2296)", "id": { "authority": "EPSG", "code": 1383 } } ], "ellipsoid": { "name": "WGS 84", "semi_major_axis": 6378137, "inverse_flattening": 298.257223563 }, "accuracy": "2.0", "id": { "authority": "EPSG", "code": 6326 } }, "coordinate_system": { "subtype": "ellipsoidal", "axis": [ { "name": "Geodetic latitude", "abbreviation": "Lat", "direction": "north", "unit": "degree" }, { "name": "Geodetic longitude", "abbreviation": "Lon", "direction": "east", "unit": "degree" } ] }, "id": { "authority": "EPSG", "code": 4326 } }, "conversion": { "name": "Equi7 projection - Africa", "method": { "name": "Azimuthal Equidistant", "id": { "authority": "EPSG", "code": 1125 } }, "parameters": [ { "name": "Latitude of natural origin", "value": 8.5, "unit": "degree", "id": { "authority": "EPSG", "code": 8801 } }, { "name": "Longitude of natural origin", "value": 21.5, "unit": "degree", "id": { "authority": "EPSG", "code": 8802 } }, { "name": "False easting", "value": 5621452.02, "unit": "metre", "id": { "authority": "EPSG", "code": 8806 } }, { "name": "False northing", "value": 5990638.423, "unit": "metre", "id": { "authority": "EPSG", "code": 8807 } } ] }, "coordinate_system": { "subtype": "Cartesian", "axis": [ { "name": "Easting", "abbreviation": "E", "direction": "east", "unit": "metre" }, { "name": "Northing", "abbreviation": "N", "direction": "north", "unit": "metre" } ] }, "scope": "Continental mapping of raster data.", "area": "Africa and the Arabian peninsula.", "bbox": { "south_latitude": -43.89, "west_longitude": -31.68, "north_latitude": 38.8, "east_longitude": 79.3 }, "id": { "authority": "EPSG", "code": 27701 } }
Definition: GeoServer
27701=PROJCS["WGS 84 / Equi7 Africa",GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4326"]],PROJECTION["Azimuthal_Equidistant"],PARAMETER["latitude_of_center",8.5],PARAMETER["longitude_of_center",21.5],PARAMETER["false_easting",5621452.02],PARAMETER["false_northing",5990638.423],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","27701"]]
Definition: Mapnik
<?xml version="1.0" encoding="utf-8"?> <Map srs="+proj=aeqd +lat_0=8.5 +lon_0=21.5 +x_0=5621452.02 +y_0=5990638.423 +datum=WGS84 +units=m +no_defs +type=crs"> <Layer srs="+proj=aeqd +lat_0=8.5 +lon_0=21.5 +x_0=5621452.02 +y_0=5990638.423 +datum=WGS84 +units=m +no_defs +type=crs"> </Layer> </Map>
Definition: SQL (PostGIS)
INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 27701, 'EPSG', 27701, '+proj=aeqd +lat_0=8.5 +lon_0=21.5 +x_0=5621452.02 +y_0=5990638.423 +datum=WGS84 +units=m +no_defs +type=crs', 'PROJCS["WGS 84 / Equi7 Africa",GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4326"]],PROJECTION["Azimuthal_Equidistant"],PARAMETER["latitude_of_center",8.5],PARAMETER["longitude_of_center",21.5],PARAMETER["false_easting",5621452.02],PARAMETER["false_northing",5990638.423],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","27701"]]');
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