1.经纬度转其他坐标系
private static final double X_PI = (3.14159265358979324 * 3000.0) / 180.0;
private static final double PI = 3.1415926535897932384626;
private static final double A = 6378245.0;
private static final double EE = 0.00669342162296594323;
/**
* 将百度坐标系 (BD-09) 转换为火星坐标系 (GCJ-02)，即 百度 转 谷歌、高德
*/
public static double[] 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);
return new double[] { gg_lng, gg_lat };
}
/**
* 将火星坐标系 (GCJ-02) 转换为百度坐标系 (BD-09)，即谷歌、高德 转 百度
*/
public static double[] 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;
return new double[] { bd_lng, bd_lat };
}
/**
* 将WGS84坐标转换为火星坐标系 (GCJ-02)
*/
public static double[] wgs84togcj02(double lng, double lat) {
if (outOfChina(lng, lat)) {
return new double[] { lng, lat };
} else {
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;
return new double[] { mglng, mglat };
}
}
/**
* 将火星坐标系 (GCJ-02) 转换为WGS84坐标
*/
public static double[] gcj02towgs84(double lng, double lat) {
if (outOfChina(lng, lat)) {
return new double[] { lng, lat };
} else {
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;
return new double[] { lng * 2 - mglng, lat * 2 - mglat };
}
}
private static 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 static 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;
}
private static boolean outOfChina(double lng, double lat) {
return lng < 72.004 || lng > 137.8347 || lat < 0.8293 || lat > 55.8271;
}
2.面转换坐标步骤
1.先获取面图形个数
String wkt="MULTIPOLYGON ((( 119.93714547 31.87885773, 119.93817544 31.87602532, 119.94246697 31.87774193, 119.93714547 31.87885773)),(( 119.93311143 31.87911522, 119.93499970 31.87757027, 119.93826127 31.88014519, 119.93311143 31.87911522)))";
WKTReader reader=new WKTReader();
Geometry read = reader.read(wkt);
int geometries = read.getNumGeometries();
2.遍历每个图形获取点坐标
for (int i = 0; i <geometries ; i++) {
Geometry geometry = read.getGeometryN(i);
Polygon polygon=(Polygon) geometry;
}
3.获取点坐标进行转换
Polygon polygon=(Polygon) geometry;
// 获取内部环
int ringSize = polygon.getNumInteriorRing();
if (ringSize>0) {
for (int j = 0; j < ringSize; j++) {
LinearRing ring = polygon.getInteriorRingN(j);
}
}
String newPolygonWkt = "POLYGON((";
List<String> newCoordinateList=new ArrayList<>();
//将面转坐标
for (Coordinate coordinate : polygon.getCoordinates()) {
double x = coordinate.x;
double y= coordinate.y;
double[] point = wgs84togcj02(x, y);
double[] bdPoint = gcj02tobd09(point[0], point[1]);
newCoordinateList.add(bdPoint[0]+" "+bdPoint[1]);
}
if (i==0) {
newPolygonWkt = newPolygonWkt + String.join(",", newCoordinateList) + "))";
newGeometry = reader.read(newPolygonWkt);
}else {
newPolygonWkt = newPolygonWkt + String.join(",", newCoordinateList) + "))";
newGeometry=newGeometry.union(reader.read(newPolygonWkt));
}
4.合并转换后的坐标系 5.最终返回结果
完整代码:
Geometry newGeometry=null;
WKTReader reader=new WKTReader();
Geometry read = reader.read(wkt);
int geometries = read.getNumGeometries();
for (int i = 0; i <geometries ; i++) {
Geometry geometry = read.getGeometryN(i);
Polygon polygon=(Polygon) geometry;
// 获取内部环
int ringSize = polygon.getNumInteriorRing();
if (ringSize>0) {
for (int j = 0; j < ringSize; j++) {
LinearRing ring = polygon.getInteriorRingN(j);
}
}
String newPolygonWkt = "POLYGON((";
List<String> newCoordinateList=new ArrayList<>();
//将面转坐标
for (Coordinate coordinate : polygon.getCoordinates()) {
double x = coordinate.x;
double y= coordinate.y;
double[] point = wgs84togcj02(x, y);
double[] bdPoint = gcj02tobd09(point[0], point[1]);
newCoordinateList.add(bdPoint[0]+" "+bdPoint[1]);
}
if (i==0) {
newPolygonWkt = newPolygonWkt + String.join(",", newCoordinateList) + "))";
newGeometry = reader.read(newPolygonWkt);
}else {
newPolygonWkt = newPolygonWkt + String.join(",", newCoordinateList) + "))";
newGeometry=newGeometry.union(reader.read(newPolygonWkt));
}
}
return newGeometry.toText();
注意:该方式基于geotools实现 内部环未进行处理 需要自行处理 采用postgis函数需要用到的函数如下
st_numgeometries() 获取图形数量
st_geometryn(geometry, int4) 获取第几个图形
st_numinteriorring(geometry) 内部图形数量
st_interiorringn(geometry, int4)获取第几个内部图形
