great circle distance function

[rajeeja]

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Proposed new feature or change:

Add a function to get the distance between two points on a shpere.

I was hoping this is already implemented, but couldn't find it. Is it there? @hongyuchen1030

[rajeeja]

@philipc2 this is closest: https://github.com/UXARRAY/uxarray/blob/main/uxarray/grid/neighbors.py#L870

[hongyuchen1030]

since it's a great circle arc on a unit sphere, the "distance" is the angle between the two endpoints, which can be easily be calculated using def _angle_of_2_vectors(u, v):

[philipc2]

@rajeeja @aaronzedwick

Can you check if we can close this?

[rajeeja]

@rajeeja @aaronzedwick

Can you check if we can close this?

utils has this function Calculate the angle between two 3D vectors u and v in radians. Can be used to calculate the span of a GCR.