X,Y图像通过旋转坐标到纬度和经度

时间:2013-08-31 21:07:28

标签: android google-maps maps google-maps-android-api-2

好吧,我有来自Google Earth的这些图像叠加数据,如下所示:

North: -7.340917
South: -7.34100
East: 112.751217
West: 112.751167
Rotation: 25.0000

我用这些函数成功地将我的图像点(x,y)转换为Lat,Lng:

static Double DEGREES_PER_RADIAN = 180 / Math.PI;
static Double RADIAN_PER_DEGREES = Math.PI / 180;

public static double Gudermannian(double y)
{
    return Math.atan(Math.sinh(y)) * DEGREES_PER_RADIAN;
}

public static double GudermannianInv(double latitude)
{
    double sign = Math.signum(latitude);
    double sin = Math.sin(latitude * RADIAN_PER_DEGREES * sign);
    return sign * (Math.log((1.0 + sin) / (1.0 - sin)) / 2.0);
}

Double mapLatNorth = -7.340917;
Double mapLatSouth = -7.34100;
Double mapLonWest = 112.751167;
Double mapLonEast = 112.751217;

Double ymax = GudermannianInv(mapLatNorth);
Double ymin = GudermannianInv(mapLatSouth);                 
Float latPoint = (float) Gudermannian(ymax - ( ((double) pointY / imgHeight) * (ymax - ymin) )) ;

Double mapLonDelta = mapLonEast - mapLonWest;
Float lngPoint = (float) (mapLonWest + pointX / imgWidth * mapLonDelta);

我从

获得的价值
latPoint

lngPoint

是正确的,但它还没有旋转。 我的问题是:如何将这些Lat / Lng值旋转25度?

我未能从Ewan Todd在Calculate lat/lng of corners of ground overlay from kml-file的回答中获得纬度/经度值

1 个答案:

答案 0 :(得分:1)

这应该可以通过简单的2D旋转来实现,并且应该是这样的:

public Float rotateLatitudeAround(Float lat, double angle, Point center) {
    lat = center.lat + (Math.cos(Math.toRadians(angle)) * (lat - center.lat) - Math.sin(Math.toRadians(angle)) * (lon - center.lon));
    return lat;
}

public Float rotateLongitudeAround(Float lon, double angle, Point center) {
    lon = center.lon + (Math.sin(Math.toRadians(angle)) * (lat - center.lat) + Math.cos(Math.toRadians(angle)) * (lon - center.lon));
    return lon;
}

但改变

center.lat 

center.getLatitudeE6()/1E6 

或者其他什么。

编辑:我确实忘了这只适用于点x,y。但是你可以先获得与地图投影中心相关的lat,lon的点数,并在它返回lat之后,从投影反向地图中获取lon值?