147 lines
4.8 KiB
JavaScript
147 lines
4.8 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.gcj02towgs84 = exports.wgs84togcj02 = exports.gcj02tobd09 = exports.bd09togcj02 = exports.getDistanceBetweenPoints = void 0;
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/**
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* 计算地球上两点之间的球面距离（单位：cm）
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*/
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function getDistanceBetweenPoints(lat1, lon1, lat2, lon2) {
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// 转为弧度
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function toRadians(d) {
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return d * Math.PI / 180;
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}
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const R = 6378137; // 地球长半径
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const φ1 = toRadians(lat1);
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const φ2 = toRadians(lat2);
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const Δφ = toRadians(lat2 - lat1);
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const Δλ = toRadians(lon2 - lon1);
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const a = Math.sin(Δφ / 2) * Math.sin(Δφ / 2) +
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Math.cos(φ1) * Math.cos(φ2) *
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Math.sin(Δλ / 2) * Math.sin(Δλ / 2);
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const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
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const d = R * c;
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return d * 1000;
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}
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exports.getDistanceBetweenPoints = getDistanceBetweenPoints;
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//定义一些常量
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const x_PI = 3.14159265358979324 * 3000.0 / 180.0;
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const PI = 3.1415926535897932384626;
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const a = 6378245.0;
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const ee = 0.00669342162296594323;
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function transformlat(lng, lat) {
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let ret = -100.0 + 2.0 * lng + 3.0 * lat + 0.2 * lat * lat + 0.1 * lng * lat + 0.2 * Math.sqrt(Math.abs(lng));
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ret += (20.0 * Math.sin(6.0 * lng * PI) + 20.0 * Math.sin(2.0 * lng * PI)) * 2.0 / 3.0;
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ret += (20.0 * Math.sin(lat * PI) + 40.0 * Math.sin(lat / 3.0 * PI)) * 2.0 / 3.0;
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ret += (160.0 * Math.sin(lat / 12.0 * PI) + 320 * Math.sin(lat * PI / 30.0)) * 2.0 / 3.0;
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return ret;
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}
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;
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function transformlng(lng, lat) {
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let ret = 300.0 + lng + 2.0 * lat + 0.1 * lng * lng + 0.1 * lng * lat + 0.1 * Math.sqrt(Math.abs(lng));
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ret += (20.0 * Math.sin(6.0 * lng * PI) + 20.0 * Math.sin(2.0 * lng * PI)) * 2.0 / 3.0;
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ret += (20.0 * Math.sin(lng * PI) + 40.0 * Math.sin(lng / 3.0 * PI)) * 2.0 / 3.0;
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ret += (150.0 * Math.sin(lng / 12.0 * PI) + 300.0 * Math.sin(lng / 30.0 * PI)) * 2.0 / 3.0;
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return ret;
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}
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;
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/**
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* 判断是否在国内，不在国内则不做偏移
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* @param lng
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* @param lat
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* @returns {boolean}
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*/
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function out_of_china(lng, lat) {
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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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}
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;
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/**
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* 百度坐标系 (BD-09) 与 火星坐标系 (GCJ-02)的转换
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* 即 百度 转 谷歌、高德
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* @param bd_lon
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* @param bd_lat
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* @returns {*[]}
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*/
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function bd09togcj02(coord) {
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const [bd_lon, bd_lat] = coord;
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const x = bd_lon - 0.0065;
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const y = bd_lat - 0.006;
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const z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_PI);
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const theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_PI);
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const gg_lng = z * Math.cos(theta);
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const gg_lat = z * Math.sin(theta);
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return [gg_lng, gg_lat];
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}
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exports.bd09togcj02 = bd09togcj02;
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;
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/**
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* 火星坐标系 (GCJ-02) 与百度坐标系 (BD-09) 的转换
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* 即谷歌、高德 转 百度
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* @param lng
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* @param lat
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* @returns {*[]}
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*/
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function gcj02tobd09(coord) {
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const [lng, lat] = coord;
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const z = Math.sqrt(lng * lng + lat * lat) + 0.00002 * Math.sin(lat * x_PI);
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const theta = Math.atan2(lat, lng) + 0.000003 * Math.cos(lng * x_PI);
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const bd_lng = z * Math.cos(theta) + 0.0065;
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const bd_lat = z * Math.sin(theta) + 0.006;
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return [bd_lng, bd_lat];
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}
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exports.gcj02tobd09 = gcj02tobd09;
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;
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/**
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* WGS84转GCj02
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* @param lng
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* @param lat
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* @returns {*[]}
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*/
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function wgs84togcj02(coord) {
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const [lng, lat] = coord;
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if (out_of_china(lng, lat)) {
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return [lng, lat];
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}
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else {
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let dlat = transformlat(lng - 105.0, lat - 35.0);
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let dlng = transformlng(lng - 105.0, lat - 35.0);
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const 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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const 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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const mglat = lat + dlat;
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const mglng = lng + dlng;
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return [mglng, mglat];
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}
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}
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exports.wgs84togcj02 = wgs84togcj02;
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;
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/**
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* GCJ02 转换为 WGS84
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* @param lng
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* @param lat
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* @returns {*[]}
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*/
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function gcj02towgs84(coord) {
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const [lng, lat] = coord;
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if (out_of_china(lng, lat)) {
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return [lng, lat];
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}
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else {
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let dlat = transformlat(lng - 105.0, lat - 35.0);
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let dlng = transformlng(lng - 105.0, lat - 35.0);
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const 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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const 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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const mglat = lat + dlat;
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const mglng = lng + dlng;
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return [lng * 2 - mglng, lat * 2 - mglat];
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}
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}
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exports.gcj02towgs84 = gcj02towgs84;
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;
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