H3 hexagons

H3 is Uber's open-source hexagonal hierarchical spatial index. We use it as the atomic unit of every Bharat-scale signal we produce.

Why hexagons

• Equal-area neighbours — squares and lat/lng tiles distort badly near the poles and unevenly in cities.
• One-hop adjacency — every cell has exactly 6 neighbours, perfect for diffusion / smoothing.
• Hierarchical — res-7 → res-8 → res-9 lets you trade resolution for cost smoothly.

Resolutions we ship

res-7  ~5 km²    coarse city slices
res-8  ~0.7 km²  ward-level views (default for env signals)
res-9  ~0.1 km²  street-grid intelligence (default for labels & POIs)
res-10 ~0.015 km² building-cluster (Pro+)

Convert

curl "https://api.gridrock.ai/v1/geo/lat-lng-to-h3?lat=19.0760&lng=72.8777&res=9"