根据经纬度和半径计算经纬度范围 (转)

一共有两个方法:

第一个是 根据提供的经度和纬度、以及半径，取得此半径内的最大最小经纬度

第二个就是根据提供的两个经纬度计算距离

public class LatLonUtil {              private static final double PI = 3.14159265;       private static final double EARTH_RADIUS = 6378137;       private static final double RAD = Math.PI / 180.0;         //@see http://snipperize.todayclose.com/snippet/php/SQL-Query-to-Find-All-Retailers-Within-a-Given-Radius-of-a-Latitude-and-Longitude--65095/        //The circumference of the earth is 24,901 miles.       //24,901/360 = 69.17 miles / degree         /**       * @param raidus 单位米       * return minLat,minLng,maxLat,maxLng       */      public static double[] getAround(double lat,double lon,int raidus){                      Double latitude = lat;           Double longitude = lon;                      Double degree = (24901*1609)/360.0;           double raidusMile = raidus;                      Double dpmLat = 1/degree;           Double radiusLat = dpmLat*raidusMile;           Double minLat = latitude - radiusLat;           Double maxLat = latitude + radiusLat;                      Double mpdLng = degree*Math.cos(latitude * (PI/180));           Double dpmLng = 1 / mpdLng;           Double radiusLng = dpmLng*raidusMile;           Double minLng = longitude - radiusLng;           Double maxLng = longitude + radiusLng;           //System.out.println("["+minLat+","+minLng+","+maxLat+","+maxLng+"]");           return new double[]{minLat,minLng,maxLat,maxLng};       }              /**       * 根据两点间经纬度坐标（double值），计算两点间距离，单位为米       * @param lng1       * @param lat1       * @param lng2       * @param lat2       * @return       */      public static double getDistance(double lng1, double lat1, double lng2, double lat2)      {         double radLat1 = lat1*RAD;          double radLat2 = lat2*RAD;          double a = radLat1 - radLat2;          double b = (lng1 - lng2)*RAD;          double s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a/2),2) +           Math.cos(radLat1)*Math.cos(radLat2)*Math.pow(Math.sin(b/2),2)));          s = s * EARTH_RADIUS;          s = Math.round(s * 10000) / 10000;          return s;       }              public static void main(String[] args){           Double lat1 = 34.264648;           Double lon1 = 108.952736;                     int radius = 1000;           //[34.25566276027792,108.94186385411045,34.27363323972208,108.96360814588955]           getAround(lat1,lon1,radius);                      //911717.0   34.264648,108.952736,39.904549,116.407288           double dis = getDistance(108.952736,34.264648,116.407288,39.904549);            System.out.println(dis);       }   }  

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原文地址:http://314858770.iteye.com/blog/939834