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Loop.Area() unit #74

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topac opened this issue Jan 25, 2021 · 1 comment

topac commented Jan 25, 2021

What is the unit of measure of the values calculated by Loop.Area()?
I'm referring to this one: https://godoc.org/github.com/golang/geo/s2#Loop.Area

What is the best way to (approximately) convert those number to square meters?

Collaborator

rsned commented Jan 25, 2021

The value is in square units on a unit sphere of radius 1. So to get to km^2, scale it by the Earth's radius squared.

In the s2 tests, we use 6371.01 km as the approximate value.

https://github.com/golang/geo/blob/master/s2/s2_test.go#L46

rsned closed this as completed

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