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-/**
- * OpenLayers Swiss (CH1903) grid projection transformations
- *
- * Provides transform functions for WGS84<->CH1903 projections.
- *
- * Maths courtesy of the Swiss Federal Office of Topography:
- * http://www.swisstopo.admin.ch/internet/swisstopo/en/home/products/software/products/skripts.html
- * Simplifed a bit, and with x/y swapped the normal way round.
- */
-
-OpenLayers.Projection.CH1903 = {
-
- // Convert WGS lat/long (° dec) to CH x
- WGStoCHx: function(lat, lng) {
-
- // Converts degrees dec to seconds
- lat = lat * 3600;
- lng = lng * 3600;
-
- // Auxiliary values (% Bern)
- var lat_aux = (lat - 169028.66) / 10000;
- var lng_aux = (lng - 26782.5) / 10000;
-
- // Process X
- var x = 600072.37;
- x = x + (211455.93 * lng_aux);
- x = x - (10938.51 * lng_aux * lat_aux);
- x = x - (0.36 * lng_aux * Math.pow(lat_aux, 2));
- x = x - (44.54 * Math.pow(lng_aux, 3));
-
- return x;
- },
-
- // Convert WGS lat/long (° dec) to CH y
- WGStoCHy: function(lat, lng) {
-
- // Converts degrees dec to seconds
- lat = lat * 3600;
- lng = lng * 3600;
-
- // Auxiliary values (% Bern)
- var lat_aux = (lat - 169028.66)/10000;
- var lng_aux = (lng - 26782.5)/10000;
-
- // Process Y
- var y = 200147.07;
- y = y + (308807.95 * lat_aux);
- y = y + (3745.25 * Math.pow(lng_aux, 2));
- y = y + (76.63 * Math.pow(lat_aux, 2));
- y = y - (194.56 * Math.pow(lng_aux, 2) * lat_aux);
- y = y + (119.79 * Math.pow(lat_aux, 3));
-
- return y;
-
- },
-
- // Convert CH x/y to WGS lat
- chToWGSlat: function(x, y) {
-
- // Converts militar to civil and to unit = 1000km
- // Axiliary values (% Bern)
- var x_aux = (x - 600000) / 1000000;
- var y_aux = (y - 200000) / 1000000;
-
- // Process lat
- var lat = 16.9023892;
- lat = lat + (3.238272 * y_aux);
- lat = lat - (0.270978 * Math.pow(x_aux, 2));
- lat = lat - (0.002528 * Math.pow(y_aux, 2));
- lat = lat - (0.0447 * Math.pow(x_aux, 2) * y_aux);
- lat = lat - (0.0140 * Math.pow(y_aux, 3));
-
- // Unit 10000" to 1 " and converts seconds to degrees (dec)
- lat = lat * 100 / 36;
-
- return lat;
-
- },
-
- // Convert CH x/y to WGS long
- chToWGSlng: function(x, y) {
-
- // Converts militar to civil and to unit = 1000km
- // Axiliary values (% Bern)
- var x_aux = (x - 600000) / 1000000;
- var y_aux = (y - 200000) / 1000000;
-
- // Process long
- var lng = 2.6779094;
- lng = lng + (4.728982 * x_aux);
- lng = lng + (0.791484 * x_aux * y_aux);
- lng = lng + (0.1306 * x_aux * Math.pow(y_aux, 2));
- lng = lng - (0.0436 * Math.pow(x_aux, 3));
-
- // Unit 10000" to 1 " and converts seconds to degrees (dec)
- lng = lng * 100 / 36;
-
- return lng;
-
- },
-
- // Function to convert a WGS84 coordinate to a Swiss coordinate.
- projectForwardSwiss: function(point) {
- var x = OpenLayers.Projection.CH1903.WGStoCHx(point.y, point.x),
- y = OpenLayers.Projection.CH1903.WGStoCHy(point.y, point.x);
- point.x = x;
- point.y = y;
- return point;
- },
-
- // Function to convert a Swiss coordinate to a WGS84 coordinate.
- projectInverseSwiss: function(point) {
- var lon = OpenLayers.Projection.CH1903.chToWGSlng(point.x, point.y);
- var lat = OpenLayers.Projection.CH1903.chToWGSlat(point.x, point.y);
- point.x = lon;
- point.y = lat;
- return point;
- }
-};
-
-/**
- * Note: One transform declared
- * Transforms from EPSG:4326 to EPSG:21781
- */
- OpenLayers.Projection.addTransform("EPSG:4326", "EPSG:21781",
- OpenLayers.Projection.CH1903.projectForwardSwiss);
- OpenLayers.Projection.addTransform("EPSG:21781", "EPSG:4326",
- OpenLayers.Projection.CH1903.projectInverseSwiss);