EPSG:17771

Equi7 projection - Africa

Attributes

Data source: EPSG

Information source: "Optimisation of global grids for high-resolution remote sensing data", Bernhard Bauer-Marschallinger, Technical University of Vienna.

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. The projection is neither conformal nor equal-area.

Method: Azimuthal Equidistant

Area of use: Africa and the Arabian peninsula.

Description: (0,)

Covered area powered by MapTiler MapTiler logo
SimpleMap
Africa and the Arabian peninsula.

MapTiler banner

Definition: OGC Well Known Text

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]

Definition: OGC Well Known Text 2 (2019)

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]],
    ID["EPSG",17771]]

Definition: ESRI Well Known Text

PROJECTION["Azimuthal_Equidistant"],
PARAMETER["False_Easting",5621452.02],
PARAMETER["False_Northing",5990638.423],
PARAMETER["Central_Meridian",21.5],
PARAMETER["Latitude_Of_Origin",8.5]

Definition: PROJ.4

+proj=aeqd +lat_0=8.5 +lon_0=21.5 +x_0=5621452.02 +y_0=5990638.423

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:17771","+proj=aeqd +lat_0=8.5 +lon_0=21.5 +x_0=5621452.02 +y_0=5990638.423");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "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
            }
        }
    ],
    "id": {
        "authority": "EPSG",
        "code": 17771
    }
}

Definition: GeoServer

17771=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]

Definition: MapServer - MAPfile

PROJECTION
	"proj=aeqd"
	"lat_0=8.5"
	"lon_0=21.5"
	"x_0=5621452.02"
	"y_0=5990638.423"
END

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">
	<Layer srs="+proj=aeqd +lat_0=8.5 +lon_0=21.5 +x_0=5621452.02 +y_0=5990638.423">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 17771, 'EPSG', 17771, '+proj=aeqd +lat_0=8.5 +lon_0=21.5 +x_0=5621452.02 +y_0=5990638.423', '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]');