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bjornharrtell/ST_AsGeobuf.md

Created July 15, 2016 09:18
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ST_AsMVT and ST_AsGeobuf
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ST_AsGeobuf.md
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ST_AsMVT.md

ST_AsMVT

Purpose

Support MapBox vector tiles as an output format directly from PostGIS.

API

Arguments

  • Layers (list of table/view names)
  • Extent (bounding box)
  • Buffer (in geometry units)
  • Tile extent (default 4046)

Implementation parts

  • Mapbox Vector Tile encoder in C (geometry encoding, attribute transfer)
  • Logic to fetch geometries from selected tables and clip to buffered tile extent
  • Logic to scale/simplify geometries to internal tile coordinate space
  • Tests

Existing stuff that should/might be useful

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