These function are used for finding the H3 index containing coordinates, and for finding the center and boundary of H3 indexes.
H3Index geoToH3(const GeoCoord *g, int res);
Indexes the location at the specified resolution, returning the index of the cell containing the location.
Returns 0 on error.
void h3ToGeo(H3Index h3, GeoCoord *g);
Finds the centroid of the index.
void h3ToGeoBoundary(H3Index h3, GeoBoundary *gp);
Finds the boundary of the index.