107 lines
4.2 KiB
JavaScript
107 lines
4.2 KiB
JavaScript
var x_pi = 3.14159265358979324 * 3000.0 / 180.0;
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var PI = 3.14159265358979324;
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const a = 6378245.0;
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const ee = 0.00669342162296594323;
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var mapZbConvert = {
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// 百度坐标bd09II转火星坐标GCJ02
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baiduTomars: function (baidu_point) {
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var mars_point = { x: 0, y: 0 };
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var x = baidu_point.x - 0.0065;
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var y = baidu_point.y - 0.006;
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var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);
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var theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);
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mars_point.x = z * Math.cos(theta);
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mars_point.y = z * Math.sin(theta);
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return mars_point;
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},
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// 火星坐标系GCJ02转地球坐标系WGS84
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transformGCJ2WGS: function (gcjLat, gcjLon) {
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let d = this.delta(gcjLat, gcjLon)
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return {
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'lat': gcjLat - d.lat,
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'lon': gcjLon - d.lon
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}
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},
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delta: function (lat, lon) {
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let a = 6378245.0 // a: 卫星椭球坐标投影到平面地图坐标系的投影因子。
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let ee = 0.00669342162296594323 // ee: 椭球的偏心率。
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let dLat = this.transformLat(lon - 105.0, lat - 35.0)
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let dLon = this.transformLon(lon - 105.0, lat - 35.0)
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let radLat = lat / 180.0 * PI
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let magic = Math.sin(radLat)
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magic = 1 - ee * magic * magic
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let sqrtMagic = Math.sqrt(magic)
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dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * PI)
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dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * PI)
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return {
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'lat': dLat,
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'lon': dLon
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}
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},
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transformLat: function (x, y) {
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let ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x))
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ret += (20.0 * Math.sin(6.0 * x * PI) + 20.0 * Math.sin(2.0 * x * PI)) * 2.0 / 3.0
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ret += (20.0 * Math.sin(y * PI) + 40.0 * Math.sin(y / 3.0 * PI)) * 2.0 / 3.0
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ret += (160.0 * Math.sin(y / 12.0 * PI) + 320 * Math.sin(y * PI / 30.0)) * 2.0 / 3.0
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return ret
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},
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transformLon: function (x, y) {
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let ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x))
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ret += (20.0 * Math.sin(6.0 * x * PI) + 20.0 * Math.sin(2.0 * x * PI)) * 2.0 / 3.0
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ret += (20.0 * Math.sin(x * PI) + 40.0 * Math.sin(x / 3.0 * PI)) * 2.0 / 3.0
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ret += (150.0 * Math.sin(x / 12.0 * PI) + 300.0 * Math.sin(x / 30.0 * PI)) * 2.0 / 3.0
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return ret
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},
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// 经纬度转墨卡托
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lonlatTomercator: function (lonlat) {
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var mercator = { x: 0, y: 0 };
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var x = lonlat.x * 20037508.34 / 180;
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var y = Math.log(Math.tan((90 + lonlat.y) * Math.PI / 360)) / (Math.PI / 180);
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y = y * 20037508.34 / 180;
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// mercator.x = x * parseFloat('0.597171361602');
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// mercator.y = y * parseFloat('0.593350031602');
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mercator.x = x;
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mercator.y = y;
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return mercator;
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},
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// 墨卡托转 经纬度
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mercatorTolonlat: function (mercator) {
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var lonlat = { x: 0, y: 0 };
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var x = mercator.x / 20037508.34 * 180;
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var y = mercator.y / 20037508.34 * 180;
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y = 180 / Math.PI * (2 * Math.atan(Math.exp(y * Math.PI / 180)) - Math.PI / 2);
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// lonlat.x = x / parseFloat('0.597171361602');
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// lonlat.y = y / parseFloat('0.604060871602');
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lonlat.x = x;
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lonlat.y = y;
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return lonlat;
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},
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wgs84togcj02(lng, lat) {
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lat = +lat;
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lng = +lng;
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if (out_of_china(lng, lat)) {
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return [lng, lat]
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} else {
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let dlat = this.transformLat(lng - 105.0, lat - 35.0);
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let dlng = this.transformLon(lng - 105.0, lat - 35.0);
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let radlat = lat / 180.0 * PI;
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let magic = Math.sin(radlat);
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magic = 1 - ee * magic * magic;
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let sqrtmagic = Math.sqrt(magic);
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dlat = (dlat * 180.0) / ((a * (1 - ee)) / (magic * sqrtmagic) * PI);
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dlng = (dlng * 180.0) / (a / sqrtmagic * Math.cos(radlat) * PI);
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let mglat = lat + dlat;
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let mglng = lng + dlng;
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return [mglng, mglat]
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}
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}
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}
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function out_of_china(lng, lat) {
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lat = +lat;
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lng = +lng;
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// 纬度3.86~53.55,经度73.66~135.05
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return !(lng > 73.66 && lng < 135.05 && lat > 3.86 && lat < 53.55);
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} |