testalt.java

基于Java的地图数据管理软件。使用MySQL数据库管理系统。

package net.aetherial.gis.test;

import net.aetherial.gis.surface.ItemValue;

public class TestAlt {
  public TestAlt(){

  }
  public static double getAlt(String altString){
    int pos = altString.indexOf("-");
    if(pos == -1){//说明是正数
      return Double.parseDouble(altString);
    }else{
      altString =altString.substring(pos,altString.length());
      return Double.parseDouble(altString);
    }
  }
  public static void main(String[] args) {
    double a = 0.0000003;
    double ya = 31.8618185905529;
    double xa = 117.106380454402;
    double yb = 31.8617739762107;
    double xb = 117.107071976706;
//    double c = a * a + a * a;
//    double b = Math.pow(c,0.5);
    double d = Math.acos(Math.sin(ya)*Math.sin(yb)+Math.cos(ya)*Math.cos(yb)*Math.cos(xa-xb))*(6371008.77140);
    System.out.println(d);
  }
}