H3Standard: A c# binding to Uber H3 C library

H3 is a geospatial indexing system using a hexagonal grid.

Documentation of the C library is available at https://uber.github.io/h3/.

Version

Bindings to Uber C library version 4.0.1

This project does not embed the corresponding native c library. It has to be build and added separately.

Prerequisites

.NET Standard 2.0 library

A _WINDOWS pragma directive has been defined to target the right name for the underlying H3 c lib, h3 in case of *Nix platforms, h3.dll in case of Windows platforms.

H3 - 4.0.1 Support

All H3 C functions are accessible via a simple wrapping, with the exact same c-style name (camel-casing).

Most of the H3 functions have a dotnet-style wrapper where out params and pre-array dimensioning are managed. They are all grouped in a new H3Net static class.

Most methods of the H3 and H3Net have been tested and validated except:

• cellsToLinkedMultiPolygon;
• cellToChildPos;
• childPosToCell;
• MISCELLANEOUS methods.

In the .Net version of polygonToCells (former Polyfill), polygons with holes are not managed.

H3 - 3.7.2.1 Support

There is a tag v3.7.2.1 on the master branch for those in need of H3 v3.7.2.1 support.

Legal and Licensing

H3 is licensed under the Apache 2.0 License.