根据经纬度数组计算面积

要求：根据后台提供的经纬度数组，计算所围成的面积。

	PointInfo pointInfo = new PointInfo(115.989099,39.646023);
    PointInfo pointInfo1 = new PointInfo(115.987394,39.645988);
    PointInfo pointInfo2 = new PointInfo(115.987371,39.647407);
    PointInfo pointInfo3 = new PointInfo(115.986684,39.647423);
    PointInfo pointInfo4 = new PointInfo(115.986602,39.648088);
    PointInfo pointInfo5 = new PointInfo(115.989095,39.648151);
    PointInfo pointInfo6= new PointInfo(115.989188,39.646021);
    PointInfo pointInfo7 = new PointInfo(115.989099,39.646023);
    ArrayList list = new ArrayList();
    list.add(pointInfo);
    list.add(pointInfo1);
    list.add(pointInfo2);
    list.add(pointInfo3);
    list.add(pointInfo4);
    list.add(pointInfo5);
    list.add(pointInfo6);
    list.add(pointInfo7);
    System.out.println(list.get(0));
    double area = 0;
    for (int i = 0; i < list.size()-1; i++) {
        PointInfo info1 = (PointInfo) list.get(i);
        PointInfo info2 = (PointInfo) list.get(i+1);
        area += ConvertToRadian(info2.Longitude - info1.Longitude) * (2 + Math.sin(ConvertToRadian(info2.Latitude)) + Math.sin(ConvertToRadian(info1.Latitude)));
        
    }
    area = area * 6378137.0 * 6378137.0 / 2.0;
    System.out.println(Math.abs(area)); 

PointInfo是存放经纬度的实体类

public class PointInfo {
    double Longitude;
    double Latitude;

    public double getLongitude() {
        return Longitude;
    }

    public void setLongitude(double longitude) {
        Longitude = longitude;
    }

    public double getLatitude() {
        return Latitude;
    }

    public void setLatitude(double latitude) {
        Latitude = latitude;
    }

    @Override
    public String toString() {
        return "PointInfo{" +
                "Longitude=" + Longitude +
                ", Latitude=" + Latitude +
                '}';
    }

    public PointInfo(double longitude, double latitude) {
        Longitude = longitude;
        Latitude = latitude;
    }
}

ConvertToRadian

    private static double ConvertToRadian(double input) {
        return input * Math.PI / 180;
    }

运行结果

注意：

上面的经纬度是double类型的数据，如果是存放在数据库中可能是decimal类型的数据，默认会在经纬度的后面填充0

计算时需要截取前十位有用的数字，否则计算出来的数据会有较大偏差。

算法借鉴：https://blog.youkuaiyun.com/cjtlp2006/article/details/76665028?spm=1001.2014.3001.5506

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