erls2: Erlang NIF to S2 Geometry library.

An Erlang NIF to S2 Geometry. This is a work in progress.

The API is not expected to match entierly s2's: the goal is to make it easily usable for most of the common gis uses cases. Most of the real interaction with s2 is done in the NIF.

Shape Index

It provides an abstraction to work with MutableS2ShapeIndex: s2_mutable_index.

{ok, Pid} = s2_mutable_index:start_link(),
ok = s2_mutable_index:add_polygon(Pid, "some-id", [[{lng, lat}, ...]]),
s2_mutable_index:contains(Pid, lng, lat).
% ["some-id"] | []

Lower level methods to use the MutableS2ShapeIndex are provided in s2 module, but be warned that some operations on the Index are not thread safe and should be executed at once (e.g. in always the same genserver).