Equi7 projection - North America

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 North America. 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: North America including Greenland, the Caribbean and Central America, together with circum-polar area north of 83°40'N. Excluding the circum-polar area, the longitude extent is from 167.65° in west across the 180° meridian to 15.72° in east.

Description: (0,)

Covered area powered by MapTiler

North America including Greenland, the Caribbean and Central America, together with circum-polar area north of 83°40'N. Excluding the circum-polar area, the longitude extent is from 167.65° in west across the 180° meridian to 15.72° in east.

Definition: OGC Well Known Text

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PROJECTION["Azimuthal_Equidistant"],
PARAMETER["latitude_of_center",52],
PARAMETER["longitude_of_center",-97.5],
PARAMETER["false_easting",8264722.177],
PARAMETER["false_northing",4867518.353]

Definition: OGC Well Known Text 2 (2019)

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CONVERSION["Equi7 projection - North America",
    METHOD["Azimuthal Equidistant",
        ID["EPSG",1125]],
    PARAMETER["Latitude of natural origin",52,
        ANGLEUNIT["degree",0.0174532925199433],
        ID["EPSG",8801]],
    PARAMETER["Longitude of natural origin",-97.5,
        ANGLEUNIT["degree",0.0174532925199433],
        ID["EPSG",8802]],
    PARAMETER["False easting",8264722.177,
        LENGTHUNIT["metre",1],
        ID["EPSG",8806]],
    PARAMETER["False northing",4867518.353,
        LENGTHUNIT["metre",1],
        ID["EPSG",8807]],
    ID["EPSG",17775]]

Definition: ESRI Well Known Text

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PROJECTION["Azimuthal_Equidistant"],
PARAMETER["False_Easting",8264722.177],
PARAMETER["False_Northing",4867518.353],
PARAMETER["Central_Meridian",-97.5],
PARAMETER["Latitude_Of_Origin",52.0]

Definition: PROJ.4

+proj=aeqd +lat_0=52 +lon_0=-97.5 +x_0=8264722.177 +y_0=4867518.353

Definition: JavaScript (Proj4js)

proj4.defs("EPSG:17775","+proj=aeqd +lat_0=52 +lon_0=-97.5 +x_0=8264722.177 +y_0=4867518.353");

Definition: JSON

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{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "Conversion",
    "name": "Equi7 projection - North America",
    "method": {
        "name": "Azimuthal Equidistant",
        "id": {
            "authority": "EPSG",
            "code": 1125
        }
    },
    "parameters": [
        {
            "name": "Latitude of natural origin",
            "value": 52,
            "unit": "degree",
            "id": {
                "authority": "EPSG",
                "code": 8801
            }
        },
        {
            "name": "Longitude of natural origin",
            "value": -97.5,
            "unit": "degree",
            "id": {
                "authority": "EPSG",
                "code": 8802
            }
        },
        {
            "name": "False easting",
            "value": 8264722.177,
            "unit": "metre",
            "id": {
                "authority": "EPSG",
                "code": 8806
            }
        },
        {
            "name": "False northing",
            "value": 4867518.353,
            "unit": "metre",
            "id": {
                "authority": "EPSG",
                "code": 8807
            }
        }
    ],
    "id": {
        "authority": "EPSG",
        "code": 17775
    }
}

Definition: GeoServer

17775=PROJECTION["Azimuthal_Equidistant"],PARAMETER["latitude_of_center",52],PARAMETER["longitude_of_center",-97.5],PARAMETER["false_easting",8264722.177],PARAMETER["false_northing",4867518.353]

Definition: MapServer - MAPfile

PROJECTION
	"proj=aeqd"
	"lat_0=52"
	"lon_0=-97.5"
	"x_0=8264722.177"
	"y_0=4867518.353"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=aeqd +lat_0=52 +lon_0=-97.5 +x_0=8264722.177 +y_0=4867518.353">
	<Layer srs="+proj=aeqd +lat_0=52 +lon_0=-97.5 +x_0=8264722.177 +y_0=4867518.353">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 17775, 'EPSG', 17775, '+proj=aeqd +lat_0=52 +lon_0=-97.5 +x_0=8264722.177 +y_0=4867518.353', 'PROJECTION["Azimuthal_Equidistant"],PARAMETER["latitude_of_center",52],PARAMETER["longitude_of_center",-97.5],PARAMETER["false_easting",8264722.177],PARAMETER["false_northing",4867518.353]');

EPSG:17775