Add ol.proj.EPSG2056 and factor out common code
This commit is contained in:
Tom Payne
3
src/ol/proj/chprojection.exports
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3
src/ol/proj/chprojection.exports
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@@ -0,0 +1,3 @@
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@exportSymbol ol.proj.CH.add
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@exportSymbol ol.proj.EPSG2056.add
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@exportSymbol ol.proj.EPSG21781.add
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265
src/ol/proj/chprojection.js
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265
src/ol/proj/chprojection.js
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@@ -0,0 +1,265 @@
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goog.provide('ol.proj.CH');
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goog.provide('ol.proj.EPSG2056');
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goog.provide('ol.proj.EPSG21781');
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goog.require('goog.asserts');
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goog.require('ol.Projection');
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goog.require('ol.ProjectionUnits');
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goog.require('ol.proj');
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goog.require('ol.proj.EPSG4326');
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/**
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* Internal base class for Swiss grid projections.
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* @constructor
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* @extends {ol.Projection}
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* @param {{code: string, extent: ol.Extent}} options Options.
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*/
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ol.proj.CH = function(options) {
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goog.base(this, {
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code: options.code,
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extent: options.extent,
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global: false,
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units: ol.ProjectionUnits.METERS
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});
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};
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goog.inherits(ol.proj.CH, ol.Projection);
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/**
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* Add EPSG:2056 and EPSG:21781 projections, and transformations between them.
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*/
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ol.proj.CH.add = function() {
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ol.proj.EPSG2056.add();
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ol.proj.EPSG21781.add();
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var epsg2056 = ol.proj.get('EPSG:2056');
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var epsg21781 = ol.proj.get('EPSG:21781');
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ol.proj.addTransform(epsg2056, epsg21781,
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goog.partial(ol.proj.CH.translate_, -2000000, -1000000));
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ol.proj.addTransform(epsg21781, epsg2056,
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goog.partial(ol.proj.CH.translate_, 2000000, 1000000));
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};
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/**
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* Transformation from EPSG:4326 to EPSG:2056/EPSG:21781.
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*
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* This uses an approximation that is accurate to about 1m.
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*
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* @see http://www.swisstopo.admin.ch/internet/swisstopo/en/home/products/software/products/skripts.html
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*
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* @param {number} offsetY Y offset.
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* @param {number} offsetX X offset.
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* @param {Array.<number>} input Input array of coordinate values.
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* @param {Array.<number>=} opt_output Output array of coordinate values.
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* @param {number=} opt_dimension Dimension (default is 2).
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* @private
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* @return {Array.<number>} Output array of coordinate values.
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*/
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ol.proj.CH.fromEPSG4326_ =
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function(offsetY, offsetX, input, opt_output, opt_dimension) {
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var n = input.length;
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var dimension = goog.isDef(opt_dimension) ? opt_dimension : 2;
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var output;
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if (goog.isDef(opt_output)) {
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output = opt_output;
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} else {
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if (dimension > 2) {
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output = input.slice();
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} else {
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output = new Array(n);
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}
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}
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goog.asserts.assert(dimension >= 2);
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goog.asserts.assert(output.length % dimension === 0);
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var auxLat, auxLon, i;
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for (i = 0; i < n; i += dimension) {
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auxLat = 36 * input[i + 1] / 100 - 16.902866;
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auxLon = 36 * input[i] / 100 - 2.67825;
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output[i] = offsetY + 72.37 +
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211455.93 * auxLon -
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10938.51 * auxLon * auxLat -
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0.36 * auxLon * auxLat * auxLat -
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44.54 * auxLon * auxLon * auxLon;
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output[i + 1] = offsetX + 147.07 +
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308807.95 * auxLat +
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3745.25 * auxLon * auxLon +
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76.63 * auxLat * auxLat -
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194.56 * auxLon * auxLon * auxLat +
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119.79 * auxLat * auxLat * auxLat;
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}
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return output;
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};
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/**
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* Transformation from EPSG:2056/EPSG:21781 to EPSG:4326.
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*
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* This uses an approximation that is accurate to about 1m.
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*
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* @see http://www.swisstopo.admin.ch/internet/swisstopo/en/home/products/software/products/skripts.html
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*
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* @param {number} offsetY Y offset.
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* @param {number} offsetX X offset.
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* @param {Array.<number>} input Input array of coordinate values.
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* @param {Array.<number>=} opt_output Output array of coordinate values.
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* @param {number=} opt_dimension Dimension (default is 2).
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* @private
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* @return {Array.<number>} Output array of coordinate values.
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*/
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ol.proj.CH.toEPSG4326_ =
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function(offsetY, offsetX, input, opt_output, opt_dimension) {
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var n = input.length;
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var dimension = goog.isDef(opt_dimension) ? opt_dimension : 2;
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var output;
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if (goog.isDef(opt_output)) {
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output = opt_output;
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} else {
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if (dimension > 2) {
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output = input.slice();
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} else {
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output = new Array(n);
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}
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}
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goog.asserts.assert(dimension >= 2);
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goog.asserts.assert(output.length % dimension === 0);
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var auxX, auxY, i;
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for (i = 0; i < n; i += dimension) {
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auxY = (input[i] - offsetY) / 1000000;
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auxX = (input[i + 1] - offsetX) / 1000000;
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output[i] = 100 * (2.6779094 +
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4.728982 * auxY +
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0.791484 * auxY * auxX +
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0.1306 * auxY * auxX * auxX -
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0.0436 * auxY * auxY * auxY) / 36;
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output[i + 1] = 100 * (16.9023892 +
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3.238272 * auxX -
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0.270978 * auxY * auxY -
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0.002528 * auxX * auxX -
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0.0447 * auxY * auxY * auxX -
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0.014 * auxX * auxX * auxX) / 36;
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}
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return output;
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};
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/**
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* Transformation between EPSG:2056 and EPSG:21781.
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*
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* Currently a simple offset is used. This is accurate to within 3m.
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*
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* @param {number} offsetY Y offset.
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* @param {number} offsetX X offset.
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* @param {Array.<number>} input Input array of coordinate values.
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* @param {Array.<number>=} opt_output Output array of coordinate values.
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* @param {number=} opt_dimension Dimension (default is 2).
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* @private
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* @return {Array.<number>} Output array of coordinate values.
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*/
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ol.proj.CH.translate_ =
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function(offsetY, offsetX, input, opt_output, opt_dimension) {
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var n = input.length;
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var dimension = goog.isDef(opt_dimension) ? opt_dimension : 2;
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var output;
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if (goog.isDef(opt_output)) {
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output = opt_output;
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} else {
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if (dimension > 2) {
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output = input.slice();
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} else {
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output = new Array(n);
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}
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}
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goog.asserts.assert(dimension >= 2);
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goog.asserts.assert(output.length % dimension === 0);
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var i;
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for (i = 0; i < n; i += dimension) {
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output[i] = input[i] + offsetY;
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output[i + 1] = input[i + 1] + offsetX;
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}
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return output;
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};
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/**
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* @inheritDoc
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*/
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ol.proj.CH.prototype.getPointResolution = function(resolution, point) {
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return resolution;
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};
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/**
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* The EPSG:2056 projection, also known as LV95 (CH1903+).
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* @constructor
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* @extends {ol.proj.CH}
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*/
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ol.proj.EPSG2056 = function() {
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goog.base(this, {
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code: 'EPSG:2056',
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extent: ol.proj.EPSG2056.EXTENT
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});
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};
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goog.inherits(ol.proj.EPSG2056, ol.proj.CH);
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/**
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* @const
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* @type {ol.Extent}
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*/
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ol.proj.EPSG2056.EXTENT =
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[2485869.5728, 2837076.5648, 1076443.1884, 1299941.7864];
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/**
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* Add the EPSG:2056 projection and transformations to and from EPSG:4326.
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*/
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ol.proj.EPSG2056.add = function() {
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ol.proj.addEquivalentProjections(ol.proj.EPSG4326.PROJECTIONS);
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var epsg2056 = new ol.proj.EPSG2056();
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ol.proj.addProjection(epsg2056);
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ol.proj.addEquivalentTransforms(
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ol.proj.EPSG4326.PROJECTIONS,
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[epsg2056],
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goog.partial(ol.proj.CH.fromEPSG4326_, 2600000, 1200000),
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goog.partial(ol.proj.CH.toEPSG4326_, 2600000, 1200000));
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};
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/**
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* The EPSG:21781 projection, also known as LV03 (CH1903).
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* @constructor
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* @extends {ol.proj.CH}
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*/
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ol.proj.EPSG21781 = function() {
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goog.base(this, {
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code: 'EPSG:21781',
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extent: ol.proj.EPSG21781.EXTENT
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});
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};
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goog.inherits(ol.proj.EPSG21781, ol.proj.CH);
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/**
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* @const
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* @type {ol.Extent}
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*/
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ol.proj.EPSG21781.EXTENT = [485869.5728, 837076.5648, 76443.1884, 299941.7864];
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/**
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* Add the EPSG:21781 projection and transformations to and from EPSG:4326.
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*/
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ol.proj.EPSG21781.add = function() {
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ol.proj.addEquivalentProjections(ol.proj.EPSG4326.PROJECTIONS);
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var epsg21781 = new ol.proj.EPSG21781();
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ol.proj.addProjection(epsg21781);
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ol.proj.addEquivalentTransforms(
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ol.proj.EPSG4326.PROJECTIONS,
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[epsg21781],
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goog.partial(ol.proj.CH.fromEPSG4326_, 600000, 200000),
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goog.partial(ol.proj.CH.toEPSG4326_, 600000, 200000));
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};
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@@ -1,2 +0,0 @@
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@exportSymbol ol.proj.EPSG21781
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@exportSymbol ol.proj.EPSG21781.add
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@@ -1,143 +0,0 @@
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goog.provide('ol.proj.EPSG21781');
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goog.require('goog.asserts');
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goog.require('ol.Projection');
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goog.require('ol.ProjectionUnits');
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goog.require('ol.proj');
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goog.require('ol.proj.EPSG4326');
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/**
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* @constructor
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* @extends {ol.Projection}
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*/
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ol.proj.EPSG21781 = function() {
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goog.base(this, {
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code: 'EPSG:21781',
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units: ol.ProjectionUnits.METERS,
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extent: ol.proj.EPSG21781.EXTENT,
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global: false
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});
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};
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goog.inherits(ol.proj.EPSG21781, ol.Projection);
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/**
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* @const
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* @type {ol.Extent}
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*/
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ol.proj.EPSG21781.EXTENT = [485869.5728, 837076.5648, 76443.1884, 299941.7864];
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/**
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* FIXME empty description for jsdoc
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*/
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ol.proj.EPSG21781.add = function() {
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ol.proj.addEquivalentProjections(ol.proj.EPSG4326.PROJECTIONS);
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var epsg21781 = new ol.proj.EPSG21781();
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ol.proj.addProjection(epsg21781);
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ol.proj.addEquivalentTransforms(
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ol.proj.EPSG4326.PROJECTIONS,
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[epsg21781],
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ol.proj.EPSG21781.fromEPSG4326,
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ol.proj.EPSG21781.toEPSG4326);
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};
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/**
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* Transformation from EPSG:4326 to EPSG:21781.
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*
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* @see http://www.swisstopo.admin.ch/internet/swisstopo/en/home/products/software/products/skripts.html
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*
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* @param {Array.<number>} input Input array of coordinate values.
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* @param {Array.<number>=} opt_output Output array of coordinate values.
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* @param {number=} opt_dimension Dimension (default is 2).
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* @return {Array.<number>} Output array of coordinate values.
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*/
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ol.proj.EPSG21781.fromEPSG4326 = function(input, opt_output, opt_dimension) {
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var n = input.length;
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var dimension = goog.isDef(opt_dimension) ? opt_dimension : 2;
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var output;
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if (goog.isDef(opt_output)) {
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output = opt_output;
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} else {
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if (dimension > 2) {
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output = input.slice();
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} else {
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output = new Array(n);
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}
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}
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goog.asserts.assert(dimension >= 2);
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goog.asserts.assert(output.length % dimension === 0);
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var auxLat, auxLon, i;
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for (i = 0; i < n; i += dimension) {
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auxLat = 36 * input[i + 1] / 100 - 16.902866;
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auxLon = 36 * input[i] / 100 - 2.67825;
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output[i] = 600072.37 +
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211455.93 * auxLon -
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10938.51 * auxLon * auxLat -
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0.36 * auxLon * auxLat * auxLat -
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44.54 * auxLon * auxLon * auxLon;
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output[i + 1] = 200147.07 +
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308807.95 * auxLat +
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3745.25 * auxLon * auxLon +
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76.63 * auxLat * auxLat -
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194.56 * auxLon * auxLon * auxLat +
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119.79 * auxLat * auxLat * auxLat;
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}
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return output;
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};
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/**
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* Transformation from EPSG:21781 to EPSG:4326.
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*
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* @see http://www.swisstopo.admin.ch/internet/swisstopo/en/home/products/software/products/skripts.html
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*
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* @param {Array.<number>} input Input array of coordinate values.
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* @param {Array.<number>=} opt_output Output array of coordinate values.
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* @param {number=} opt_dimension Dimension (default is 2).
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* @return {Array.<number>} Output array of coordinate values.
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*/
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ol.proj.EPSG21781.toEPSG4326 = function(input, opt_output, opt_dimension) {
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var n = input.length;
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var dimension = goog.isDef(opt_dimension) ? opt_dimension : 2;
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var output;
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if (goog.isDef(opt_output)) {
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output = opt_output;
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} else {
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if (dimension > 2) {
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output = input.slice();
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} else {
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output = new Array(n);
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}
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}
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goog.asserts.assert(dimension >= 2);
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goog.asserts.assert(output.length % dimension === 0);
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var auxX, auxY, i;
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for (i = 0; i < n; i += dimension) {
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auxY = (input[i] - 600000) / 1000000;
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auxX = (input[i + 1] - 200000) / 1000000;
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output[i] = 100 * (2.6779094 +
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4.728982 * auxY +
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0.791484 * auxY * auxX +
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0.1306 * auxY * auxX * auxX -
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0.0436 * auxY * auxY * auxY) / 36;
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output[i + 1] = 100 * (16.9023892 +
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3.238272 * auxX -
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0.270978 * auxY * auxY -
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0.002528 * auxX * auxX -
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0.0447 * auxY * auxY * auxX -
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0.014 * auxX * auxX * auxX) / 36;
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}
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return output;
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};
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/**
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* @inheritDoc
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*/
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ol.proj.EPSG21781.prototype.getPointResolution = function(resolution, point) {
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return resolution;
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};
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112
test/spec/ol/proj/chprojection.test.js
Normal file
112
test/spec/ol/proj/chprojection.test.js
Normal file
@@ -0,0 +1,112 @@
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goog.provide('ol.test.proj.CH');
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goog.provide('ol.test.proj.EPSG2056');
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goog.provide('ol.test.proj.EPSG21781');
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describe('ol.proj.CH', function() {
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||||
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beforeEach(function() {
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ol.proj.CH.add();
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});
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it('can transform from EPSG:2056 to EPSG:21781', function() {
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var output = ol.proj.transform(
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[2660389.515487, 1185731.630396], 'EPSG:2056', 'EPSG:21781');
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expect(output).to.be.an(Array);
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expect(output).to.have.length(2);
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expect(output[0]).to.roughlyEqual(660389.515487, 1e-9);
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expect(output[1]).to.roughlyEqual(185731.630396, 1e-9);
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});
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it('can transform from EPSG:21781 to EPSG:2056', function() {
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||||
var output = ol.proj.transform(
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||||
[660389.515487, 185731.630396], 'EPSG:21781', 'EPSG:2056');
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||||
expect(output).to.be.an(Array);
|
||||
expect(output).to.have.length(2);
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||||
expect(output[0]).to.roughlyEqual(2660389.515487, 1e-10);
|
||||
expect(output[1]).to.roughlyEqual(1185731.630396, 1e-10);
|
||||
});
|
||||
|
||||
});
|
||||
|
||||
|
||||
describe('ol.proj.EPSG2056', function() {
|
||||
|
||||
var epsg2056;
|
||||
beforeEach(function() {
|
||||
ol.proj.EPSG2056.add();
|
||||
epsg2056 = ol.proj.get('EPSG:2056');
|
||||
expect(epsg2056).to.be.an(ol.Projection);
|
||||
});
|
||||
|
||||
it('transforms from EPSG:2056 to EPSG:4326', function() {
|
||||
var wgs84 = ol.proj.transform(
|
||||
[2660389.515487, 1185731.630396], 'EPSG:2056', 'EPSG:4326');
|
||||
expect(wgs84).to.be.an(Array);
|
||||
expect(wgs84).to.have.length(2);
|
||||
expect(wgs84[0]).to.roughlyEqual(8.23, 1e-3);
|
||||
expect(wgs84[1]).to.roughlyEqual(46.82, 1e-3);
|
||||
});
|
||||
|
||||
it('transforms from EPSG:4326 to EPSG:2056', function() {
|
||||
var ch1903 = ol.proj.transform([8.23, 46.82], 'EPSG:4326', 'EPSG:2056');
|
||||
expect(ch1903).to.be.an(Array);
|
||||
expect(ch1903).to.have.length(2);
|
||||
expect(ch1903[0]).to.roughlyEqual(2660389.515487, 1);
|
||||
expect(ch1903[1]).to.roughlyEqual(1185731.630396, 1);
|
||||
});
|
||||
|
||||
});
|
||||
|
||||
|
||||
|
||||
describe('ol.proj.EPSG21781', function() {
|
||||
|
||||
var epsg21781;
|
||||
beforeEach(function() {
|
||||
ol.proj.EPSG21781.add();
|
||||
epsg21781 = ol.proj.get('EPSG:21781');
|
||||
expect(epsg21781).to.be.an(ol.Projection);
|
||||
});
|
||||
|
||||
it('does not lose too much accuracy when round-tripping', function() {
|
||||
var extent = epsg21781.getExtent();
|
||||
var fromEPSG4326 = ol.proj.getTransform('EPSG:4326', 'EPSG:21781');
|
||||
var toEPSG4326 = ol.proj.getTransform('EPSG:21781', 'EPSG:4326');
|
||||
var roundTripped, x, y;
|
||||
for (x = extent[0]; x < extent[1]; x += 50000) {
|
||||
for (y = extent[2]; y < extent[3]; y += 50000) {
|
||||
roundTripped = fromEPSG4326(toEPSG4326([x, y]));
|
||||
expect(roundTripped).to.be.an(Array);
|
||||
expect(roundTripped).to.have.length(2);
|
||||
expect(roundTripped[0]).to.roughlyEqual(x, 1e1);
|
||||
expect(roundTripped[1]).to.roughlyEqual(y, 1e1);
|
||||
}
|
||||
}
|
||||
});
|
||||
|
||||
it('transforms from EPSG:21781 to EPSG:4326', function() {
|
||||
var wgs84 = ol.proj.transform(
|
||||
[660389.515487, 185731.630396], 'EPSG:21781', 'EPSG:4326');
|
||||
expect(wgs84).to.be.an(Array);
|
||||
expect(wgs84).to.have.length(2);
|
||||
expect(wgs84[0]).to.roughlyEqual(8.23, 1e-3);
|
||||
expect(wgs84[1]).to.roughlyEqual(46.82, 1e-3);
|
||||
});
|
||||
|
||||
it('transforms from EPSG:4326 to EPSG:21781', function() {
|
||||
var ch1903 = ol.proj.transform([8.23, 46.82], 'EPSG:4326', 'EPSG:21781');
|
||||
expect(ch1903).to.be.an(Array);
|
||||
expect(ch1903).to.have.length(2);
|
||||
expect(ch1903[0]).to.roughlyEqual(660389.515487, 1);
|
||||
expect(ch1903[1]).to.roughlyEqual(185731.630396, 1);
|
||||
});
|
||||
|
||||
});
|
||||
|
||||
|
||||
goog.require('ol.Projection');
|
||||
goog.require('ol.proj');
|
||||
goog.require('ol.proj.CH');
|
||||
goog.require('ol.proj.EPSG2056');
|
||||
goog.require('ol.proj.EPSG21781');
|
||||
@@ -1,50 +0,0 @@
|
||||
goog.provide('ol.test.proj.EPSG21781');
|
||||
|
||||
|
||||
describe('ol.proj.EPSG21781', function() {
|
||||
|
||||
var epsg21781;
|
||||
beforeEach(function() {
|
||||
ol.proj.EPSG21781.add();
|
||||
epsg21781 = ol.proj.get('EPSG:21781');
|
||||
expect(epsg21781).to.be.an(ol.Projection);
|
||||
});
|
||||
|
||||
it('does not lose too much accuracy when round-tripping', function() {
|
||||
var extent = epsg21781.getExtent();
|
||||
var roundTripped, x, y;
|
||||
for (x = extent[0]; x < extent[1]; x += 50000) {
|
||||
for (y = extent[2]; y < extent[3]; y += 50000) {
|
||||
roundTripped = ol.proj.EPSG21781.fromEPSG4326(
|
||||
ol.proj.EPSG21781.toEPSG4326([x, y]));
|
||||
expect(roundTripped).to.be.an(Array);
|
||||
expect(roundTripped).to.have.length(2);
|
||||
expect(roundTripped[0]).to.roughlyEqual(x, 1e1);
|
||||
expect(roundTripped[1]).to.roughlyEqual(y, 1e1);
|
||||
}
|
||||
}
|
||||
});
|
||||
|
||||
it('transforms from EPSG:21781 to EPSG:4326', function() {
|
||||
var wgs84 = ol.proj.transform(
|
||||
[660389.515487, 185731.630396], 'EPSG:21781', 'EPSG:4326');
|
||||
expect(wgs84).to.be.an(Array);
|
||||
expect(wgs84).to.have.length(2);
|
||||
expect(wgs84[0]).to.roughlyEqual(8.23, 1e-3);
|
||||
expect(wgs84[1]).to.roughlyEqual(46.82, 1e-3);
|
||||
});
|
||||
|
||||
it('transforms from EPSG:4326 to EPSG:21781', function() {
|
||||
var ch1903 = ol.proj.transform([8.23, 46.82], 'EPSG:4326', 'EPSG:21781');
|
||||
expect(ch1903).to.be.an(Array);
|
||||
expect(ch1903).to.have.length(2);
|
||||
expect(ch1903[0]).to.roughlyEqual(660389.515487, 1);
|
||||
expect(ch1903[1]).to.roughlyEqual(185731.630396, 1);
|
||||
});
|
||||
|
||||
});
|
||||
|
||||
|
||||
goog.require('ol.Projection');
|
||||
goog.require('ol.proj');
|
||||
goog.require('ol.proj.EPSG21781');
|
||||
Reference in New Issue
Block a user