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Core concepts

LocateTile​

A LocateTile is a rectangular cell in geodetic latitude/longitude coordinates, addressed by:

  • level (resolution)
  • ix (longitude index)
  • iy (latitude index)

Level​

At level = L, the world is partitioned into a uniform grid:

  • NX = 2^L tiles across longitude
  • NY = 2^L tiles across latitude

Canonical identifier​

LocateTile IDs are represented canonically as:

lt:<level>:<ix>:<iy>

Alternative encodings may exist but must round-trip exactly to the canonical form.