从两个坐标计算中点 [英] Calculating midpoint from two coordinates
问题描述
我试图找到两个点之间的中点时有一些问题。这里就是我得到两个点之间的最短距离的一部分:
双距离= 0;
双minDistance依旧= Double.MAX_VALUE;
convertedHotSpotGeomList = RetrieveHotSpotAsyncTask.convertedHotSpotGeom;
经纬度[] minPoints =新的经纬度[2];
的for(int i = 0; I< convertedHotSpotGeomList.size();我++){
经纬度点1 =新经纬度(convertedHotSpotGeomList.get(ⅰ).getY(),convertedHotSpotGeomList.get(ⅰ).getX());
经纬度点2 =新的经纬度(convertedHotSpotGeomList.get(+ I).getY(),convertedHotSpotGeomList.get(++ I).getX());
距离= calculateDistance(点1,点2);
如果(距离< minDistance依旧){
minDistance依旧=距离;
minPoints [0] =点1;
minPoints [1] =点2;
}
}
//完成所有的比较,得出的圈子
如果(minPoints [0] =空&安培;!&安培;!minPoints [1] =空){
CircleOptions circleOptions =新CircleOptions()
.center(minPoints [0])
.radius(1000)
.fillColor(Color.argb(95,178,30,37))
.strokeColor(Color.TRANSPARENT);
CircleOptions circleOptions1 =新CircleOptions()
.center(minPoints [1])
.radius(1000)
.fillColor(Color.argb(95,88,130,37))
.strokeColor(Color.TRANSPARENT);
googleBasemap.addCircle(circleOptions);
googleBasemap.addCircle(circleOptions1);
中点(minPoints [0] .latitude,minPoints [0] .longitude,minPoints [1] .latitude,minPoints [1] .longitude);
}
}
再从两个圆我画的中心点,我调用此方法来获取中间点:
私人无效中点(双LAT1,双lon1,双LAT2,双lon2){
双dLon = Math.toRadians(lon2 - lon1);
LAT1 = Math.toRadians(LAT1);
LAT2 = Math.toRadians(LAT2);
lon1 = Math.toRadians(lon1);
双的Bx = Math.cos(LAT2)* Math.cos(dLon);
双增= Math.cos(LAT2)* Math.sin(dLon);
双lat3 = Math.atan2(Math.sin(LAT1)+ Math.sin(LAT2)的Math.sqrt((Math.cos(LAT1)+ Bx的)*(Math.cos(LAT1)+ Bx的)+按*通过));
双lon3 = lon1 + Math.atan2(通过,Math.cos(LAT1)+ Bx的);
Log.i(LAT,将String.valueOf(lat3));
Log.i(LON,将String.valueOf(lon3));
CircleOptions circleOptions =新CircleOptions()
.center(新经纬度(lon3,lat3))
.radius(1000)
.fillColor(Color.argb(95,178,30,137))
.strokeColor(Color.TRANSPARENT);
googleBasemap.addCircle(circleOptions);
}
目前的中点,我想画另一个圈子到谷歌地图。然而,当我打印出来的纬度和经度为中点,我得到这样的:
LAT 0.02512664 LON 1.811859
对谷歌地图
据我所知道,坐标应该是103,1。我想这是因为该格式是不同的,这就是为什么第三个圆不出来。任何想法?
在此先感谢。
双lat3 = Math.atan2(Math.sin(LAT1)+ ...
双lon3 = lon1 + Math.atan2(通过,Math.cos(LAT1)+ Bx的);
这将返回弧度。去度:
双latdeg = Math.toDegrees(lat3);
双londeg = Math.toDegrees(lon3);
103.81187377279383
1.4396504253445948
I was having some problem when trying to find the mid point between two point. Here is the part where I get the shortest distance between two point:
double distance = 0;
double minDistance = Double.MAX_VALUE;
convertedHotSpotGeomList = RetrieveHotSpotAsyncTask.convertedHotSpotGeom;
LatLng[] minPoints = new LatLng[2];
for(int i = 0; i < convertedHotSpotGeomList.size(); i++){
LatLng point1 = new LatLng(convertedHotSpotGeomList.get(i).getY(), convertedHotSpotGeomList.get(i).getX());
LatLng point2 = new LatLng(convertedHotSpotGeomList.get(++i).getY(), convertedHotSpotGeomList.get(++i).getX());
distance = calculateDistance(point1, point2);
if(distance < minDistance){
minDistance = distance;
minPoints[0] = point1;
minPoints[1] = point2;
}
}
// Finish all the comparison and draw the circles
if(minPoints[0]!=null && minPoints[1] !=null){
CircleOptions circleOptions = new CircleOptions()
.center(minPoints[0])
.radius(1000)
.fillColor(Color.argb(95, 178, 30, 37))
.strokeColor(Color.TRANSPARENT);
CircleOptions circleOptions1= new CircleOptions()
.center(minPoints[1])
.radius(1000)
.fillColor(Color.argb(95, 88, 130, 37))
.strokeColor(Color.TRANSPARENT);
googleBasemap.addCircle(circleOptions);
googleBasemap.addCircle(circleOptions1);
midPoint(minPoints[0].latitude,minPoints[0].longitude,minPoints[1].latitude,minPoints[1].longitude);
}
}
And then from the center point of the two circles I drawn, I am calling this method to get the midpoint:
private void midPoint(double lat1,double lon1,double lat2,double lon2){
double dLon = Math.toRadians(lon2 - lon1);
lat1 = Math.toRadians(lat1);
lat2 = Math.toRadians(lat2);
lon1 = Math.toRadians(lon1);
double Bx = Math.cos(lat2) * Math.cos(dLon);
double By = Math.cos(lat2) * Math.sin(dLon);
double lat3 = Math.atan2(Math.sin(lat1) + Math.sin(lat2), Math.sqrt((Math.cos(lat1) + Bx) * (Math.cos(lat1) + Bx) + By * By));
double lon3 = lon1 + Math.atan2(By, Math.cos(lat1) + Bx);
Log.i("LAT", String.valueOf(lat3));
Log.i("LON", String.valueOf(lon3));
CircleOptions circleOptions = new CircleOptions()
.center(new LatLng(lon3, lat3))
.radius(1000)
.fillColor(Color.argb(95, 178, 30, 137))
.strokeColor(Color.TRANSPARENT);
googleBasemap.addCircle(circleOptions);
}
At the midpoint, I wanted to draw another circle onto the google map. However, when I print out the lat and lng for the mid point, I am getting this:
LAT 0.02512664 LON 1.811859
From what I've known, the coordinate of google map should be in 103. , 1. . I guess it's because the format is different and that's why the third circle is not coming out. Any ideas?
Thanks in advance.
double lat3 = Math.atan2(Math.sin(lat1) +...
double lon3 = lon1 + Math.atan2(By, Math.cos(lat1) + Bx);
This returns radians. Go to degrees:
double latdeg = Math.toDegrees(lat3);
double londeg = Math.toDegrees(lon3);
103.81187377279383
1.4396504253445948
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