[ANN] gos2: S2 geometry library in Go

[David Symonds]

I'm pleased to announce the initial open source release of the Go port
of the S2 geometry library:

https://code.google.com/p/gos2/
http://godoc.org/code.google.com/p/gos2/s2

(or "go get code.google.com/p/gos2/s2".)

/*
Package s2 implements types and functions for working with geometry in
S² (spherical geometry).

Its related packages, parallel to this one, are s1 (operates on S¹),
r1 (operates on ℝ¹) and r3 (operates on ℝ³).

This package provides types and functions for the S2 cell hierarchy
and coordinate systems. The S2 cell hierarchy is a hierarchical
decomposition of the surface of a unit sphere (S²) into “cells”; it is
highly efficient, scales from continental size to under 1 cm² and
preserves spatial locality (nearby cells have close IDs).

A presentation that gives an overview of S2 is
https://docs.google.com/presentation/d/1Hl4KapfAENAOf4gv-pSngKwvS_jwNVHRPZTTDzXXn6Q/view.
*/


Note that it is not as complete as the C++ version it is based on, but
it works well for what it does support, and is sufficient for geo
indexing and the like.

[Fumin Wang]

This is great work and a much needed library, thanks a lot to you David and the other authors.

However, this port apparently still lacks a major part of the original C++/Java implementation, such as the S2RegionCoverer class and intersect methods of the Cell and S2LatLngRect classes.

I see that there are some attempts at completing this port including http://godoc.org/github.com/timehop/gos2/s2 but unfortunately none of them are on par.

Any plans or suggestions to get the community help out and involve deeper with the project at https://code.google.com/p/gos2/ ?

[mho...@uber.com]

I am trying to find a group associated with https://code.google.com/archive/p/s2-geometry-library/. This is the only post that comes up when searching groups.

My question on the library is, Do the bounding polygons associated with a cell id include the boundaries or sides of the polygon? If so what sides (top, left), (bottom, left)... etc?

Thanks,

Matthew Hoggan

[dja...@gmail.com]

Hi,

this package is moved to

https://github.com/golang/geo

just in case you don't noticed.

Djadala

[Robert Snedegar]

Are you using the C++ or Go libraries?  

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