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32 lines
1.3 KiB
Go
32 lines
1.3 KiB
Go
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/*
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Copyright 2014 Google Inc. All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/*
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Package s2 implements types and functions for working with geometry in S² (spherical geometry).
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Its related packages, parallel to this one, are s1 (operates on S¹), r1 (operates on ℝ¹)
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and r3 (operates on ℝ³).
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This package provides types and functions for the S2 cell hierarchy and coordinate systems.
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The S2 cell hierarchy is a hierarchical decomposition of the surface of a unit sphere (S²)
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into ``cells''; it is highly efficient, scales from continental size to under 1 cm²
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and preserves spatial locality (nearby cells have close IDs).
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A presentation that gives an overview of S2 is
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https://docs.google.com/presentation/d/1Hl4KapfAENAOf4gv-pSngKwvS_jwNVHRPZTTDzXXn6Q/view.
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*/
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package s2
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