@programmerare/sweden_crs_transformations
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TypeScript/JavaScript library for transformation of geographic coordinates between WGS84 and the Swedish coordinate reference systems SWEREF99 and RT90
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JavaScript
;
/*
* https://github.com/TomasJohansson/sweden_crs_transformations_4typescript
* Copyright (c) Tomas Johansson , http://www.programmerare.com
* The code in this 'sweden_crs_transformations_4typescript' library is licensed with MIT.
* The library is based on the C#.NET library 'sweden_crs_transformations_4net' (https://github.com/TomasJohansson/sweden_crs_transformations_4net)
* and the Dart library 'sweden_crs_transformations_4dart' (https://github.com/TomasJohansson/sweden_crs_transformations_4dart)
* Both above libraries are based on the C#.NET library 'MightyLittleGeodesy' (https://github.com/bjornsallarp/MightyLittleGeodesy/)
* which is also released with MIT.
* License information about 'sweden_crs_transformations_4typescript' and 'MightyLittleGeodesy':
* https://github.com/TomasJohansson/sweden_crs_transformations_4typescript/blob/typescript_SwedenCrsTransformations/LICENSE
*/
Object.defineProperty(exports, "__esModule", { value: true });
/**
* Crs = Coordinate reference system.
*
* There are three kind of coordinate systems supported and defined by this CrsProjection class:
* WGS84 (global standard "GPS" coordinates with latitude and longitude)
* SWEREF99 (the new Swedish grid, 13 versions, one national grid and 12 local projection zones)
* RT90 (the old Swedish grid, 6 local projection zones)
*
* Regarding the EPSG numbers (constructor parameter), at the links below you can find some more information about "EPSG".
* {@link https://en.wikipedia.org/wiki/EPSG_Geodetic_Parameter_Dataset}
* {@link https://epsg.org}
* {@link https://epsg.io}
*/
var CrsProjection = /** @class */ (function () {
function CrsProjection(epsgNumber) {
this.epsgNumber = epsgNumber;
}
CrsProjection.prototype.getEpsgNumber = function () {
return this.epsgNumber;
};
// ------------------------------------------------------
// Four public instance methods:
/** True if the coordinate reference system is WGS84 */
CrsProjection.prototype.isWgs84 = function () {
return this == CrsProjection.wgs84;
};
/** True if the coordinate reference system is a version of SWEREF99 */
CrsProjection.prototype.isSweref = function () {
return CrsProjection._epsgLowerValueForSweref <= this.epsgNumber && this.epsgNumber <= CrsProjection._epsgUpperValueForSweref;
};
/** True if the coordinate reference system is a version of RT90 */
CrsProjection.prototype.isRT90 = function () {
return CrsProjection._epsgLowerValueForRT90 <= this.epsgNumber && this.epsgNumber <= CrsProjection._epsgUpperValueForRT90;
};
/**
* A string representation of the projection.
* The string returned is the same as the name (in the above 20 static fields)
* but uppercased, e.g. wgs84 ==> "WGS84" and "sweref_99_tm" ==> "SWEREF_99_TM"
*/
CrsProjection.prototype.getAsString = function () {
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/entries
// ECMAScript 2017 includes Object.entries
// https://en.wikipedia.org/wiki/ECMAScript#8th_Edition_%E2%80%93_ECMAScript_2017
for (var _i = 0, _a = Object.entries(CrsProjection); _i < _a.length; _i++) {
var _b = _a[_i], theKey = _b[0], theValue = _b[1];
if (theKey != null && theValue != null && theValue.getEpsgNumber && this.getEpsgNumber() === theValue.getEpsgNumber()) {
return theKey.toUpperCase();
}
}
throw Error("Could not render the CrsProjection as a string. The EPSG number for the failed projection: " + this.getEpsgNumber());
};
// ------------------------------------------------------
/**
* Factory method creating an instance of 'CrsProjection' by its number (EPSG) value.
*/
CrsProjection.getCrsProjectionByEpsgNumber = function (epsg) {
var values = CrsProjection.getAllCrsProjections();
for (var _i = 0, values_1 = values; _i < values_1.length; _i++) {
var crsProjection = values_1[_i];
if (crsProjection.getEpsgNumber() === epsg) {
return crsProjection;
}
}
throw new Error("Could not find CrsProjection for EPSG " + epsg);
};
/**
* Returning an array with all supported projections.
* The order is: The very first item is the projection WGS84,
* and after that they are increased by EPSG number,
* i.e. the first (after wgs84) is sweref_99_tm (EPSG 3006)
* and the last is rt90_5_0_gon_o (EPSG 3024)
*/
CrsProjection.getAllCrsProjections = function () {
return [
CrsProjection.wgs84,
CrsProjection.sweref_99_tm,
CrsProjection.sweref_99_12_00,
CrsProjection.sweref_99_13_30,
CrsProjection.sweref_99_15_00,
CrsProjection.sweref_99_16_30,
CrsProjection.sweref_99_18_00,
CrsProjection.sweref_99_14_15,
CrsProjection.sweref_99_15_45,
CrsProjection.sweref_99_17_15,
CrsProjection.sweref_99_18_45,
CrsProjection.sweref_99_20_15,
CrsProjection.sweref_99_21_45,
CrsProjection.sweref_99_23_15,
CrsProjection.rt90_7_5_gon_v,
CrsProjection.rt90_5_0_gon_v,
CrsProjection.rt90_2_5_gon_v,
CrsProjection.rt90_0_0_gon_v,
CrsProjection.rt90_2_5_gon_o,
CrsProjection.rt90_5_0_gon_o
];
};
// ------------------------------------------------------
// Below are the static instances for the 20 supported coordinate reference systems (wgs84, sweref99 and rt90)
/**
* {@link https://epsg.org/crs_4326/WGS-84.html}
* {@link https://epsg.io/4326}
* {@link https://spatialreference.org/ref/epsg/4326/}
* {@link https://en.wikipedia.org/wiki/World_Geodetic_System#A_new_World_Geodetic_System:_WGS_84}
*/
CrsProjection.wgs84 = new CrsProjection(4326);
/**
* "SWEREF 99 TM" (with EPSG code 3006) is the new national projection.
* {@link https://www.lantmateriet.se/sv/Kartor-och-geografisk-information/gps-geodesi-och-swepos/referenssystem/tvadimensionella-system/sweref-99-projektioner/}
* {@link https://epsg.org/crs_3006/SWEREF99-TM.html}
* {@link https://epsg.io/3006}
* {@link https://spatialreference.org/ref/epsg/3006/}
*/
CrsProjection.sweref_99_tm = new CrsProjection(3006); // national sweref99 CRS
// local sweref99 systems (the new swedish national system):
CrsProjection.sweref_99_12_00 = new CrsProjection(3007);
CrsProjection.sweref_99_13_30 = new CrsProjection(3008);
CrsProjection.sweref_99_15_00 = new CrsProjection(3009);
CrsProjection.sweref_99_16_30 = new CrsProjection(3010);
CrsProjection.sweref_99_18_00 = new CrsProjection(3011);
CrsProjection.sweref_99_14_15 = new CrsProjection(3012);
CrsProjection.sweref_99_15_45 = new CrsProjection(3013);
CrsProjection.sweref_99_17_15 = new CrsProjection(3014);
CrsProjection.sweref_99_18_45 = new CrsProjection(3015);
CrsProjection.sweref_99_20_15 = new CrsProjection(3016);
CrsProjection.sweref_99_21_45 = new CrsProjection(3017);
CrsProjection.sweref_99_23_15 = new CrsProjection(3018);
// local RT90 systems (the old swedish national system):
CrsProjection.rt90_7_5_gon_v = new CrsProjection(3019);
CrsProjection.rt90_5_0_gon_v = new CrsProjection(3020);
/**
* {@link https://epsg.org/crs_3021/RT90-2-5-gon-V.html}
* {@link https://epsg.io/3021}
* {@link https://spatialreference.org/ref/epsg/3021/}
*/
CrsProjection.rt90_2_5_gon_v = new CrsProjection(3021);
CrsProjection.rt90_0_0_gon_v = new CrsProjection(3022);
CrsProjection.rt90_2_5_gon_o = new CrsProjection(3023);
CrsProjection.rt90_5_0_gon_o = new CrsProjection(3024);
// ------------------------------------------------------
// Four static fields used by some of the above instance methods
CrsProjection._epsgLowerValueForSweref = 3006; // sweref_99_tm
CrsProjection._epsgUpperValueForSweref = 3018;
CrsProjection._epsgLowerValueForRT90 = 3019;
CrsProjection._epsgUpperValueForRT90 = 3024;
return CrsProjection;
}());
exports.default = CrsProjection;
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