sviolet.thistle.util.conversion.LatLonUtils Maven / Gradle / Ivy
/*
* Copyright (C) 2015-2018 S.Violet
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Project GitHub: https://github.com/shepherdviolet/thistle
* Email: [email protected]
*/
package sviolet.thistle.util.conversion;
import sviolet.thistle.util.math.MathUtils;
/**
* 经纬度工具
* @author S.Violet
*/
public class LatLonUtils {
private static final double EARTH_RADIUS = 6378.137;
/**
* 根据两点经纬度计算距离
*
* @param lat1 纬度1
* @param lng1 经度1
* @param lat2 纬度2
* @param lng2 经度2
* @return 距离(米)
*/
public static double getDistance(double lat1, double lng1, double lat2,
double lng2) {
double lat1Rad = MathUtils.rad(lat1);
double lat2Rad = MathUtils.rad(lat2);
double latRadOffset = lat1Rad - lat2Rad;
double lngRadOffset = MathUtils.rad(lng1) - MathUtils.rad(lng2);
double distance = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(latRadOffset / 2), 2)
+ Math.cos(lat1Rad) * Math.cos(lat2Rad)
* Math.pow(Math.sin(lngRadOffset / 2), 2)));
distance = distance * EARTH_RADIUS;
distance = Math.round(distance * 10000d) / 10000d;
return distance * 1000;
}
}