标签:WGS84 经纬度 pout double System 墨卡托 坐标 println out
经纬度,墨卡托等坐标转换
1.经纬度转墨卡托1.1Java:
public static double[] lngLat2Mercator(double lng, double lat) {
double[] xy = new double[2];
double x = lng * 20037508.342789 / 180;
double y = Math.log(Math.tan((90 + lat) * M_PI / 360)) / (M_PI / 180);
y = y * 20037508.34789 / 180;
xy[0] = x;
xy[1] = y;
return xy;
}
1.2Scala:
/**
* 坐标转换
*/
object CoorTransfom {
private val M_PI = Math.PI
//经纬度转墨卡托
def lngLat2Mercator(lng: Double, lat: Double): Array[Double] = {
val xy = new Array[Double](2)
val x = lng * 20037508.342789 / 180
var y = Math.log(Math.tan((90 + lat) * M_PI / 360)) / (M_PI / 180)
y = y * 20037508.34789 / 180
xy(0) = x
xy(1) = y
xy
}
}
2.墨卡托转经纬度
public static double[] mercator2LngLat(double mercatorX, double mercatorY) {
double[] xy = new double[2];
double x = mercatorX / 20037508.34 * 180;
double y = mercatorY / 20037508.34 * 180;
y = 180 / M_PI * (2 * Math.atan(Math.exp(y * M_PI / 180)) - M_PI / 2);
xy[0] = x;
xy[1] = y;
return xy;
}
3.proj4方式
原文地址:坐标系转换成墨卡托 java 实现,最好使用成熟proj4或proj470
Maven:
<dependency>
<groupId>org.osgeo</groupId>
<artifactId>proj4j</artifactId>
<version>0.1.0</version>
</dependency>
源码:
import org.osgeo.proj4j.CRSFactory;
import org.osgeo.proj4j.CoordinateReferenceSystem;
import org.osgeo.proj4j.CoordinateTransform;
import org.osgeo.proj4j.CoordinateTransformFactory;
import org.osgeo.proj4j.ProjCoordinate;
public class Test {
static final String WGS84_PARAM = "+title=long/lat:WGS84 +proj=longlat +datum=WGS84 +units=degrees";
CoordinateReferenceSystem WGS84 = crsFactory.createFromParameters("WGS84",
WGS84_PARAM);
private static final CoordinateTransformFactory ctFactory = new CoordinateTransformFactory();
private static final CRSFactory crsFactory = new CRSFactory();
private static CoordinateReferenceSystem createCRS(String crsSpec) {
CoordinateReferenceSystem crs = null;
// test if name is a PROJ4 spec
if (crsSpec.indexOf("+") >= 0 || crsSpec.indexOf("=") >= 0) {
crs = crsFactory.createFromParameters("Anon", crsSpec);
} else {
crs = crsFactory.createFromName(crsSpec);
}
// crs = crsFactory.createFromParameters("Anon", crsSpec);
return crs;
}
public static void main(String[] args) {
// new CoordinateTransformTester(true).checkTransform("EPSG:4269",
// 117.19625, 31.83879,
// "+proj=tmerc +lat_0=0 +lon_0=117 +y_0=0 +x_0=500000 +k=0.9996 +pm=0
// +zone=50 +to_meter=1 +a=6378137 +rf=298.257223563 +nodefs",
// 1640416.667, 916074.825, 0.1);
// lonlat2m();
m2lonlat();
}
private static void lonlat2m() {
System.out.println("....");
// 117.19625 31.83879 518568.9 3522583.9
double x1 = 117.19625d;
double y1 = 31.83879d;
// double x2 = 518568.9d;
// double y2 = 3522583.9d;
// String srcCRS = "EPSG:4269";
String WGS84_PARAM = "+title=long/lat:WGS84 +proj=longlat +datum=WGS84 +units=degrees";
String tgtCRS = "+proj=tmerc +lat_0=0 +lon_0=117 +y_0=0 +x_0=500000 +k=0.9996 +zone=50 +to_meter=1 +a=6378137 +ellps=WGS84 +units=m +no_defs";
CoordinateTransform trans = ctFactory
.createTransform(createCRS(WGS84_PARAM), createCRS(tgtCRS));
ProjCoordinate pout = new ProjCoordinate();
ProjCoordinate p = new ProjCoordinate(x1, y1);
trans.transform(p, pout);
System.out.println(p.x);
System.out.println(p.y);
System.out.println(pout.x);
System.out.println(pout.y);
System.out.println("------- // 117.19625 31.83879 518568.9 3522583.9 ");
p = new ProjCoordinate(y1, x1);
trans.transform(p, pout);
// System.out.println(p.x);
// System.out.println(p.y);
// System.out.println(pout.x);
// System.out.println(pout.y);
}
private static void m2lonlat() {
System.out.println("....");
// 117.19625 31.83879 518568.9 3522583.9
// double x2 = 117.19625d;
// double y2 = 31.83879d;
double x1 = 518568.9d;
double y1 = 3522583.9d;
// String srcCRS = "EPSG:4269";
String WGS84_PARAM = "+title=long/lat:WGS84 +proj=longlat +datum=WGS84 +units=degrees";
String tgtCRS = "+proj=tmerc +lat_0=0 +lon_0=117 +y_0=0 +x_0=500000 +k=0.9996 +zone=50 +to_meter=1 +a=6378137 +ellps=WGS84 +units=m +no_defs";
CoordinateTransform trans = ctFactory
.createTransform( createCRS(tgtCRS),createCRS(WGS84_PARAM));
ProjCoordinate pout = new ProjCoordinate();
ProjCoordinate p = new ProjCoordinate(x1, y1);
trans.transform(p, pout);
System.out.println(p.x);
System.out.println(p.y);
System.out.println(pout.x);
System.out.println(pout.y);
System.out.println("------- // 117.19625 31.83879 518568.9 3522583.9 ");
p = new ProjCoordinate(y1, x1);
trans.transform(p, pout);
// System.out.println(p.x);
// System.out.println(p.y);
// System.out.println(pout.x);
// System.out.println(pout.y);
}
}
标签:WGS84,经纬度,pout,double,System,墨卡托,坐标,println,out 来源: https://blog.51cto.com/u_15078339/2869918
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