百度坐标转换，以及国测局、WGS84（GPS）坐标系之间的转换札记

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原创最新推荐文章于 2026-05-05 10:53:43 发布 7.6k 阅读 AI 写同款· GEO 优化 ›

从百度地图获取水库位置及名字，并将其BD09坐标系转为WGS84坐标系在`get_reservoirs`函数中需要传入指定的经度和纬度信息，在函数中使用请求地址和参数来获取周围指定范围内的所有水库信息。在`bd09_to_wgs84`函数中，通过调用百度API将百度坐标系转换为wgs84坐标系，并返回Point对象。然后，通过调用API接口获取到指定区域内的水库信息，其JSON格式的响应包含了水库的名称和经纬度坐标信息。'''将百度坐标系（bd09ll）下的Point对象转为wgs84坐标系''''''获取指定经纬度周围5公里范围内的所有水库信息，并返回''' 阅读详情

背景介绍

坐标系转换，网上内容也比较多、也比较杂，有的可以运行，有的则各种问题，这里记录并加以补充，最后封装了常用坐标系转换工具。亲测可运行！

WGS84：即地球坐标系，国际上通用的坐标系。谷歌地图采用的是WGS84地理坐标系（中国范围除外）
GCJ02：即火星坐标系，中国国家测绘局制订。由WGS84坐标系经加密而成，谷歌中国地图和搜搜中国均采用的是GCJ02
BD09ll：即百度坐标系，经GCJ02加密后的坐标系，百度坐标系除了baidu09ll之外还有baidu09mc（墨卡托坐标）坐标
搜狗坐标系、图吧坐标系等也是在GCJ02基础上加密而成

坐标转换接口

先定义一个表示坐标的JavaBean:

/**
 * @author zhanghuigen@cetiti.com
 * @since 0.1.0
 **/
public class CoordinateBean {
    /**
     * 定位的几个基本信息
     */
    private double longitude;

    private double latitude;

    private boolean isChina;

    public CoordinateBean() {

    }

    public CoordinateBean(double longitude, double latitude) {
        this.longitude = longitude;
        this.latitude = latitude;
    }

    public double getLongitude() {
        return longitude;
    }

    public void setLongitude(double longitude) {
        this.longitude = longitude;
    }

    public double getLatitude() {
        return latitude;
    }

    public void setLatitude(double latitude) {
        this.latitude = latitude;
    }

    public boolean isChina() {
        return isChina;
    }

    public void setChina(boolean china) {
        this.isChina = china;
    }

    @Override
    public String toString(){
        return this.latitude + "_" + this.longitude;
    }

}

坐标转换工具类：

/**
 *
 * @author zhanghuigen@cetiti.com
 * @since 0.1.0
 *
 */

public class PositionConvertUtil {

    private static final double A = 6378245.0;
    private static final double PI = 3.1415926535897932384626;
    private static final double EE = 0.00669342162296594323;
    private static final double LON_BOUNDARY_MIN = 72.004;
    private static final double LAT_BOUNDARY_MIN = 0.8293;
    private static final double LON_BOUNDARY_MAX = 137.8347;
    private static final double LAT_BOUNDARY_MAX = 55.8271;
    private static final double X_PI = 3.14159265358979324 * 3000.0 / 180.0;

    /**
     * wgs84  to   gcj02
     * @param lat lat
     * @param lon lon
     * @return coordinate
     */
    public CoordinateBean wgs84ToGcj02(double lat, double lon) {
        CoordinateBean info = new CoordinateBean();
        if (outOfChina(lat, lon)) {
            info.setChina(false);
            info.setLatitude(lat);
            info.setLongitude(lon);
        }else {
            double dLat = transformLat(lon - 105.0, lat - 35.0);
            double dLon = transformLon(lon - 105.0, lat - 35.0);
            double radLat = lat / 180.0 * PI;
            double magic = Math.sin(radLat);
            magic = 1 - EE * magic * magic;
            double sqrtMagic = Math.sqrt(magic);
            dLat = (dLat * 180.0) / ((A * (1 - EE)) / (magic * sqrtMagic) * PI);
            dLon = (dLon * 180.0) / (A / sqrtMagic * Math.cos(radLat) * PI);
            double mgLat = lat + dLat;
            double mgLon = lon + dLon;
            info.setChina(true);
            info.setLatitude(mgLat);
            info.setLongitude(mgLon);
        }
        return info;
    }

    /**
     * gcj02  to  wgs84
     * @param lat lat
     * @param lon lat
     * @return coordinate
     */
    public CoordinateBean gcj02ToWgs84(double lat, double lon) {
        CoordinateBean info = new CoordinateBean();
        CoordinateBean gps = transform(lat, lon);
        double lontitude = lon * 2 - gps.getLongitude();
        double latitude = lat * 2 - gps.getLatitude();
        info.setChina(gps.isChina());
        info.setLatitude(latitude);
        info.setLongitude(lontitude);
        return info;
    }

    /**
     * 百度坐标系 (BD-09ll) 与 火星坐标系 (GCJ-02)的转换
     * 即 百度 转 谷歌中国、高德
     * @param bdLat bdLat
     * @param bdLon bdLon
     * @return coordinate
     */
    public CoordinateBean bd09tToGcj02(double bdLat,double bdLon){
        double x = bdLon - 0.0065;
        double y = bdLat - 0.006;
        double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * X_PI);
        double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * X_PI);
        double ggLng = z * Math.cos(theta);
        double ggLat = z * Math.sin(theta);
        return new CoordinateBean(ggLng,ggLat);
    }



    /**
     * 火星坐标系 (GCJ-02) 与百度坐标系 (BD-09ll) 的转换
     * 即谷歌中国、高德 转 百度
     * @param lon lng
     * @param lat lat
     * @return coordinate
     */
    public CoordinateBean gcj02ToBd09(double lat, double lon){
        double z = Math.sqrt(lon * lon + lat * lat) + 0.00002 * Math.sin(lat * X_PI);
        double theta = Math.atan2(lat, lon) + 0.000003 * Math.cos(lon * X_PI);
        double bdLng = z * Math.cos(theta) + 0.0065;
        double bdLat = z * Math.sin(theta) + 0.006;
        return new CoordinateBean(bdLng,bdLat);
    }

    /**
     * baidu09ll to wgs84
     * 即谷歌中国、高德 转 百度
     * @param lat lat
     * @param lon lng
     * @return coordinate
     */
    public CoordinateBean baidu09ToWgs84(double lat, double lon){
        CoordinateBean info = bd09tToGcj02(lat,lon);
        info = gcj02ToWgs84(info.getLatitude(),info.getLongitude());
        return info;
    }

    /**
     * 这里的传参是WGS84 即gps坐标
     * @param lat lat
     * @param lon lon
     * @return boolean
     */
    private boolean outOfChina(double lat, double lon) {
        if (lon < LON_BOUNDARY_MIN || lon > LON_BOUNDARY_MAX){
            return true;
        }
        return lat < LAT_BOUNDARY_MIN || lat > LAT_BOUNDARY_MAX;
    }

    private double transformLon(double x, double y) {
        double 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;
    }

    private double transformLat(double lng,double lat) {
        double ret = -100.0 + 2.0 * lng + 3.0 * lat + 0.2 * lat * lat + 0.1 * lng * lat + 0.2 * Math.sqrt(Math.abs(lng));
        ret += (20.0 * Math.sin(6.0 * lng * PI) + 20.0 * Math.sin(2.0 * lng * PI)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(lat * PI) + 40.0 * Math.sin(lat / 3.0 * PI)) * 2.0 / 3.0;
        ret += (160.0 * Math.sin(lat / 12.0 * PI) + 320 * Math.sin(lat * PI / 30.0)) * 2.0 / 3.0;
        return ret;
    }

    private CoordinateBean transform(double lat, double lon) {
        CoordinateBean info = new CoordinateBean();
        if (outOfChina(lat, lon)) {
            info.setChina(false);
            info.setLatitude(lat);
            info.setLongitude(lon);
            return info;
        }
        double dLat = transformLat(lon - 105.0, lat - 35.0);
        double dLon = transformLon(lon - 105.0, lat - 35.0);
        double radLat = lat / 180.0 * PI;
        double magic = Math.sin(radLat);
        magic = 1 - EE * magic * magic;
        double sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / ((A * (1 - EE)) / (magic * sqrtMagic) * PI);
        dLon = (dLon * 180.0) / (A / sqrtMagic * Math.cos(radLat) * PI);
        double mgLat = lat + dLat;
        double mgLon = lon + dLon;
        info.setChina(true);
        info.setLatitude(mgLat);
        info.setLongitude(mgLon);
        return info;
    }
}

百度坐标系之间的转换（即baidu09ll转baidu09mc）

/**
 * @author zhanghuigen@cetiti.com
 * @since 0.1.0
 **/
public class CoordinatesConvert {
    private static double[] MCBAND = {12890594.86, 8362377.87, 5591021d, 3481989.83, 1678043.12, 0d};
    private static double[] LLBAND = {75d, 60d, 45d, 30d, 15d, 0d};
    private static double[][] MC2LL = {{1.410526172116255e-8, 0.00000898305509648872, -1.9939833816331, 200.9824383106796, -187.2403703815547, 91.6087516669843, -23.38765649603339, 2.57121317296198, -0.03801003308653, 17337981.2}, {-7.435856389565537e-9, 0.000008983055097726239, -0.78625201886289, 96.32687599759846, -1.85204757529826, -59.36935905485877, 47.40033549296737, -16.50741931063887, 2.28786674699375, 10260144.86}, {-3.030883460898826e-8, 0.00000898305509983578, 0.30071316287616, 59.74293618442277, 7.357984074871, -25.38371002664745, 13.45380521110908, -3.29883767235584, 0.32710905363475, 6856817.37}, {-1.981981304930552e-8, 0.000008983055099779535, 0.03278182852591, 40.31678527705744, 0.65659298677277, -4.44255534477492, 0.85341911805263, 0.12923347998204, -0.04625736007561, 4482777.06}, {3.09191371068437e-9, 0.000008983055096812155, 0.00006995724062, 23.10934304144901, -0.00023663490511, -0.6321817810242, -0.00663494467273, 0.03430082397953, -0.00466043876332, 2555164.4}, {2.890871144776878e-9, 0.000008983055095805407, -3.068298e-8, 7.47137025468032, -0.00000353937994, -0.02145144861037, -0.00001234426596, 0.00010322952773, -0.00000323890364, 826088.5}};
    private static double[][] LL2MC = {{-0.0015702102444, 111320.7020616939, 1704480524535203d, -10338987376042340d, 26112667856603880d, -35149669176653700d, 26595700718403920d, -10725012454188240d, 1800819912950474d, 82.5}, {0.0008277824516172526, 111320.7020463578, 647795574.6671607, -4082003173.641316, 10774905663.51142, -15171875531.51559, 12053065338.62167, -5124939663.577472, 913311935.9512032, 67.5}, {0.00337398766765, 111320.7020202162, 4481351.045890365, -23393751.19931662, 79682215.47186455, -115964993.2797253, 97236711.15602145, -43661946.33752821, 8477230.501135234, 52.5}, {0.00220636496208, 111320.7020209128, 51751.86112841131, 3796837.749470245, 992013.7397791013, -1221952.21711287, 1340652.697009075, -620943.6990984312, 144416.9293806241, 37.5}, {-0.0003441963504368392, 111320.7020576856, 278.2353980772752, 2485758.690035394, 6070.750963243378, 54821.18345352118, 9540.606633304236, -2710.55326746645, 1405.483844121726, 22.5}, {-0.0003218135878613132, 111320.7020701615, 0.00369383431289, 823725.6402795718, 0.46104986909093, 2351.343141331292, 1.58060784298199, 8.77738589078284, 0.37238884252424, 7.45}};

    /**
     * 墨卡托坐标转经纬度坐标
     * @param x x
     * @param y y
     * @return map
     */
    public Map<String, Double> convertMC2LL(double x, double y) {
        double[] cF = null;
        x = Math.abs(x);
        y = Math.abs(y);
        for (int cE = 0; cE < MCBAND.length; cE++) {
            if (y >= MCBAND[cE]) {
                cF = MC2LL[cE];
                break;
            }
        }
        Map<String,Double> location = converter(x, y, cF);
        location.put("lng",location.get("x"));
        location.remove("x");
        location.put("lat",location.get("y"));
        location.remove("y");
        return location;
    }

    /**
     * 经纬度坐标转墨卡托坐标, 已做小数位保留（8位、10位）
     * @param lng lonti
     * @param lat lati
     * @return map
     */
    public String convertLL2MC(Double lng, Double lat) {
        double[] cE = null;
        lng = getLoop(lng, -180, 180);
        lat = getRange(lat, -74, 74);
        for (int i = 0; i < LLBAND.length; i++) {
            if (lat >= LLBAND[i]) {
                cE = LL2MC[i];
                break;
            }
        }
        if (cE!=null) {
            for (int i = LLBAND.length - 1; i >= 0; i--) {
                if (lat <= -LLBAND[i]) {
                    cE = LL2MC[i];
                    break;
                }
            }
        }
        Map<String, Double> map =  converter(lng,lat, cE);
        double x = map.get("x");
        double y = map.get("y");
        BigDecimal xTemp = new BigDecimal(x);
        BigDecimal yTemp = new BigDecimal(y);
        String tempX = xTemp.setScale(8,BigDecimal .ROUND_HALF_UP).toPlainString();
        String tempY = yTemp.setScale(10,BigDecimal .ROUND_HALF_UP).toPlainString();
        return "x="+tempX+"&y="+tempY;
    }

    private Map<String, Double> converter(double x, double y, double[] cE) {
        double xTemp = cE[0] + cE[1] * Math.abs(x);
        double cC = Math.abs(y) / cE[9];
        double yTemp = cE[2] + cE[3] * cC + cE[4] * cC * cC + cE[5] * cC * cC * cC + cE[6] * cC * cC * cC * cC + cE[7] * cC * cC * cC * cC * cC + cE[8] * cC * cC * cC * cC * cC * cC;
        xTemp *= (x < 0 ? -1 : 1);
        yTemp *= (y < 0 ? -1 : 1);
        Map<String, Double> location = new HashMap<>(4);
        BigDecimal tempX = new BigDecimal(xTemp);
        BigDecimal tempY = new BigDecimal(yTemp);
        xTemp = tempX.setScale(8, BigDecimal.ROUND_HALF_UP).doubleValue();
        yTemp = tempY.setScale(8, BigDecimal.ROUND_HALF_UP).doubleValue();
        location.put("x", xTemp);
        location.put("y", yTemp);
        return location;
    }

    private Double getLoop(Double lng, Integer min, Integer max) {
        while (lng > max) {
            lng -= max - min;
        }
        while (lng < min) {
            lng += max - min;
        }
        return lng;
    }

    private Double getRange(Double lat, Integer min, Integer max) {
        if (min != null) {
            lat = Math.max(lat, min);
        }
        if (max != null) {
            lat = Math.min(lat, max);
        }
        return lat;
    }
}

注意

坐标转换后存在精度损失，所以多次转换并反转后会有些许偏差，但偏差不是很大。
这里给出一个坐标转换的测试链接，百度坐标可通过百度坐标提取器获取。

wgs转bd09ll

亦可参考如下代码：

public class Wgs84ToBd09ll {

    static double x_PI = 3.14159265358979324 * 3000.0 / 180.0;
    static double PI = 3.1415926535897932384626;
    static double a = 6378245.0;
    static double ee = 0.00669342162296594323;

    /**
     * 百度坐标系 (BD-09) 与 火星坐标系 (GCJ-02)的转换
     * 即 百度 转 谷歌、高德
     * @param bd_lon
     * @param bd_lat
     * @returns {*[]}
     */
    private String  bd09togcj02(double bd_lon, double bd_lat){
        double x = bd_lon - 0.0065;
        double y = bd_lat - 0.006;
        double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_PI);
        double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_PI);
        double gg_lng = z * Math.cos(theta);
        double gg_lat = z * Math.sin(theta);
        // Point point=new Point(gg_lng, gg_lat);
        // return point;
        return gg_lng+","+gg_lat;
    }

    /**
     * 火星坐标系 (GCJ-02) 与百度坐标系 (BD-09) 的转换
     * 即谷歌、高德 转 百度
     * @param lng
     * @param lat
     * @returns {*[]}
     */
    private String gcj02tobd09(double lng, double lat){
        double z = Math.sqrt(lng * lng + lat * lat) + 0.00002 * Math.sin(lat * x_PI);
        double theta = Math.atan2(lat, lng) + 0.000003 * Math.cos(lng * x_PI);
        double bd_lng = z * Math.cos(theta) + 0.0065;
        double bd_lat = z * Math.sin(theta) + 0.006;
        //Point point=new Point(bd_lng, bd_lat);
        // return point;
        return bd_lng+","+bd_lat;
    };

    /**
     * WGS84转GCj02
     * @param lng
     * @param lat
     * @returns {*[]}
     */
    private String wgs84togcj02(double lng, double lat){
        double dlat = transformlat(lng - 105.0, lat - 35.0);
        double dlng = transformlng(lng - 105.0, lat - 35.0);
        double radlat = lat / 180.0 * PI;
        double magic = Math.sin(radlat);
        magic = 1 - ee * magic * magic;
        double sqrtmagic = Math.sqrt(magic);
        dlat = (dlat * 180.0) / ((a * (1 - ee)) / (magic * sqrtmagic) * PI);
        dlng = (dlng * 180.0) / (a / sqrtmagic * Math.cos(radlat) * PI);
        double mglat = lat + dlat;
        double mglng = lng + dlng;
        //Point point=new Point(mglng, mglat);
        // return point;
        return mglng+","+mglat;
    };

    /**
     * GCJ02 转换为 WGS84
     * @param lng
     * @param lat
     * @returns {*[]}
     */
    private String gcj02towgs84(double lng, double lat){
        double dlat = transformlat(lng - 105.0, lat - 35.0);
        double dlng = transformlng(lng - 105.0, lat - 35.0);
        double radlat = lat / 180.0 * PI;
        double magic = Math.sin(radlat);
        magic = 1 - ee * magic * magic;
        double sqrtmagic = Math.sqrt(magic);
        dlat = (dlat * 180.0) / ((a * (1 - ee)) / (magic * sqrtmagic) * PI);
        dlng = (dlng * 180.0) / (a / sqrtmagic * Math.cos(radlat) * PI);
        double mglat = lat + dlat;
        double mglng = lng + dlng;
        // Point point=new Point(mglng, mglat);
        // return point;
        return mglat+","+mglng;
    };

    /**
     * WGS84 转换为 BD-09
     * @param lng
     * @param lat
     * @returns {*[]}
     *
     */
    public String  wgs84tobd09(double lng, double lat){
        //第一次转换
        double dlat = transformlat(lng - 105.0, lat - 35.0);
        double dlng = transformlng(lng - 105.0, lat - 35.0);
        double radlat = lat / 180.0 * PI;
        double magic = Math.sin(radlat);
        magic = 1 - ee * magic * magic;
        double sqrtmagic = Math.sqrt(magic);
        dlat = (dlat * 180.0) / ((a * (1 - ee)) / (magic * sqrtmagic) * PI);
        dlng = (dlng * 180.0) / (a / sqrtmagic * Math.cos(radlat) * PI);
        double mglat = lat + dlat;
        double mglng = lng + dlng;

        //第二次转换
        double z = Math.sqrt(mglng * mglng + mglat * mglat) + 0.00002 * Math.sin(mglat * x_PI);
        double theta = Math.atan2(mglat, mglng) + 0.000003 * Math.cos(mglng * x_PI);
        double bd_lng = z * Math.cos(theta) + 0.0065;
        double bd_lat = z * Math.sin(theta) + 0.006;
        return bd_lng+","+bd_lat;
    }

    private double transformlat(double lng,double lat){
        double ret= -100.0 + 2.0 * lng + 3.0 * lat + 0.2 * lat * lat + 0.1 * lng * lat + 0.2 * Math.sqrt(Math.abs(lng));
        ret += (20.0 * Math.sin(6.0 * lng * PI) + 20.0 * Math.sin(2.0 * lng * PI)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(lat * PI) + 40.0 * Math.sin(lat / 3.0 * PI)) * 2.0 / 3.0;
        ret += (160.0 * Math.sin(lat / 12.0 * PI) + 320 * Math.sin(lat * PI / 30.0)) * 2.0 / 3.0;
        return ret;
    }

    private double transformlng(double lng,double lat){
        double ret = 300.0 + lng + 2.0 * lat + 0.1 * lng * lng + 0.1 * lng * lat + 0.1 * Math.sqrt(Math.abs(lng));
        ret += (20.0 * Math.sin(6.0 * lng * PI) + 20.0 * Math.sin(2.0 * lng * PI)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(lng * PI) + 40.0 * Math.sin(lng / 3.0 * PI)) * 2.0 / 3.0;
        ret += (150.0 * Math.sin(lng / 12.0 * PI) + 300.0 * Math.sin(lng / 30.0 * PI)) * 2.0 / 3.0;
        return ret;
    }

}