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69 lines
1.7 KiB
69 lines
1.7 KiB
3 years ago
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/**
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* @module ol/proj/epsg4326
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*/
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import Projection from './Projection.js';
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/**
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* Semi-major radius of the WGS84 ellipsoid.
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*
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* @const
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* @type {number}
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*/
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export const RADIUS = 6378137;
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/**
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* Extent of the EPSG:4326 projection which is the whole world.
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*
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* @const
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* @type {import("../extent.js").Extent}
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*/
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export const EXTENT = [-180, -90, 180, 90];
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/**
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* @const
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* @type {number}
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*/
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export const METERS_PER_UNIT = (Math.PI * RADIUS) / 180;
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/**
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* @classdesc
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* Projection object for WGS84 geographic coordinates (EPSG:4326).
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*
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* Note that OpenLayers does not strictly comply with the EPSG definition.
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* The EPSG registry defines 4326 as a CRS for Latitude,Longitude (y,x).
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* OpenLayers treats EPSG:4326 as a pseudo-projection, with x,y coordinates.
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*/
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class EPSG4326Projection extends Projection {
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/**
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* @param {string} code Code.
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* @param {string} [axisOrientation] Axis orientation.
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*/
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constructor(code, axisOrientation) {
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super({
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code: code,
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units: 'degrees',
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extent: EXTENT,
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axisOrientation: axisOrientation,
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global: true,
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metersPerUnit: METERS_PER_UNIT,
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worldExtent: EXTENT,
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});
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}
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}
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/**
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* Projections equal to EPSG:4326.
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*
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* @const
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* @type {Array<import("./Projection.js").default>}
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*/
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export const PROJECTIONS = [
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new EPSG4326Projection('CRS:84'),
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new EPSG4326Projection('EPSG:4326', 'neu'),
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new EPSG4326Projection('urn:ogc:def:crs:OGC:1.3:CRS84'),
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new EPSG4326Projection('urn:ogc:def:crs:OGC:2:84'),
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new EPSG4326Projection('http://www.opengis.net/def/crs/OGC/1.3/CRS84'),
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new EPSG4326Projection('http://www.opengis.net/gml/srs/epsg.xml#4326', 'neu'),
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new EPSG4326Projection('http://www.opengis.net/def/crs/EPSG/0/4326', 'neu'),
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];
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