distanceTo返回多少距离? [英] What distance does distanceTo returns?

问题描述

是否考虑到海拔高度的变化?

Does it take into account altitude changes?

我的意思是，如果我从该三角形的左顶点开始并在右上顶点结束，它返回的距离是a还是b?

I mean, if I start in left vertex of this triangle and end in the right upper vertex, does it return distance a or b?

double distanceInMetersFloat = initialPosition.distanceTo(finalPosition);

在我的应用中，initialPosition和finalPosition都是具有高度的位置(我使用Google Elevation API对其进行了设置).

In my app, both initialPosition and finalPosition are Location with altitudes (I set them with Google Elevation API).

根据Google:

距离是使用WGS84椭球定义的.

Distance is defined using the WGS84 ellipsoid.

但是您可以在有或没有海拔的情况下做到这一点.

But you can do it with or without altitudes.

推荐答案

计算 Location.distanceTo 时不考虑海拔高度.

The altitude is not taken into account when computing Location.distanceTo.

您可以像这样测试它:

Location location1 = new Location("");
location1.setLatitude(40);
location1.setLongitude(-4);
location1.setAltitude(0);

Location location2 = new Location("");
location2.setLatitude(30);
location2.setLongitude(-3);
location2.setAltitude(0);

Location location3 = new Location("");
location3.setLatitude(30);
location3.setLongitude(-3);
location3.setAltitude(100);

Log.e("Without altitude", ""+location1.distanceTo(location2));
Log.e("With altitude", ""+location1.distanceTo(location3));
Log.e("Different altitude", ""+location2.distanceTo(location3));

这是输出:

E/无海拔:1113141.5

E/有海拔:1113141.5

E/不同高度:0.0

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