各大廠商座標系轉換js版
阿新 • • 發佈:2020-07-08
let pi = 3.1415926535897932384626; let x_pi = 3.14159265358979324 * 3000.0 / 180.0; let a = 6378245.0; let ee = 0.00669342162296594323; class LngLonUtil { static transformLat(x, y) { 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)); ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0; ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0; ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0; return ret; } static transformLon(x, y) { let ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x)); ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0; ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0; ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0; return ret; } /** * @param lon 經度 * @param lat 緯度 * @return */ static transformCommon(lon, lat) { if (LngLonUtil.outOfChina(lon, lat)) { return [lon, lat]; } let dLat = LngLonUtil.transformLat(lon - 105.0, lat - 35.0); let dLon = LngLonUtil.transformLon(lon - 105.0, lat - 35.0); let radLat = lat / 180.0 * pi; let magic = Math.sin(radLat); magic = 1 - ee * magic * magic; let sqrtMagic = Math.sqrt(magic); dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi); dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi); let mgLat = lat + dLat; let mgLon = lon + dLon; return [mgLon, mgLat]; } /** * 84 ==》 高德 * * @param lon 經度 * @param lat 緯度 * @return */ static gps84_To_Gcj02(lon, lat) { if (LngLonUtil.outOfChina(lon, lat)) { return [lat, lon]; } let dLat = LngLonUtil.transformLat(lon - 105.0, lat - 35.0); let dLon = LngLonUtil.transformLon(lon - 105.0, lat - 35.0); let radLat = lat / 180.0 * pi; let magic = Math.sin(radLat); magic = 1 - ee * magic * magic; let sqrtMagic = Math.sqrt(magic); dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi); dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi); let mgLat = lat + dLat; let mgLon = lon + dLon; return [mgLon, mgLat]; } /** * 高德 ==》 84 * * @param lon 經度 * @param lat 緯度 * @return */ static gcj02_To_Gps84(lon, lat) { let gps = LngLonUtil.transformCommon(lon, lat); let longitude = lon * 2 - gps[0]; let latitude = lat * 2 - gps[1]; return [longitude, latitude]; } /** * 判斷是否在中國 * * @param lon 經度 * @param lat 緯度 * @return */ static outOfChina(lon, lat) { if (lon < 72.004 || lon > 137.8347 || lat < 0.8293 || lat > 55.8271) { return true; } return false; } }