Table of Contents


The H3 geospatial indexing system is a multi-precision hexagonal tiling of the sphere indexed with hierarchical linear indexes. The H3 Core Library provides functions for converting between latitude/longitude coordinates and H3 geospatial indexes. Specifically, the major library entry point functions (defined in h3api.h) provide the functionality:

  • given a latitude/longitude point, find the index of the containing H3 cell at a particular resolution
  • given an H3 index, find the latitude/longitude cell center
  • given an H3 index, determine the cell boundary in latitude/longitude coordinates
  • and more.

The H3 Core Library is written entirely in C. Bindings for other languages are available.