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ZFXY: a 3D spatio-temporal tiling scheme proposal for optimized data access

ZFXY: a 3D spatio-temporal tiling scheme proposal for optimized data access

UN Open GIS Initiative Monthly VTC, 2022-03

Hidenori FUJIMURA

March 16, 2022
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  1. ZFXY: a 3D spatio-temporal tiling scheme proposal for optimized data

    access Hidenori (UN Vector Tile Toolkit / Geospatial Information Authority of Japan)
  2. Introduction of background: 3D geospatial projects in Japan

  3. GSI secured budget for point cloud data (regular budget [2

    million USD] + external supplementary budget)
  4. Shizuoka Prefecture is completing provision of point cloud data as

    Open Data
  5. City Bureau of MLIT has been leading 3D city modeling

    throuh Project PLATEAU
  6. Tokyo Metropolitan Government started Tokyo Digital Twin Project

  7. 3D Spatial Information Infrastructure project led by Ministry of Economy,

    Trade, and Industry / IPA DADC
  8. Civic, humanitarian, and educational project: DRONEBIRD led by Taichi -

    3D point cloud from photogrammetry
  9. Our UNVT colleague Takayuki appointed in 3D spatial information infrastructure

    design committee by IPA DADC.
  10. UNVT Community is working on: How can we optimize access

    to 3D geospatial data?
  11. Tile: industry standard in web maps {z}/{x}/{y} z: zoom index,

    x: west-east index, y: north-south index
  12. ZFXY: 3D extension to the tile-scheme {z}/{f}/{x}/{y} z: zoom index,

    f: height index, x: west-east index, y: north-south index
  13. f: height index, or floor-number index f = floor(n *

    h / H) where h = elevation [m], n = 2 ^ z, and H = 2 ^ 25 [m] Height of a voxel represented by a ZFXY with z=25 is 1 [m].
  14. https://github.com/unvt/zfxy-spec

  15. https://github.com/unvt/zfxy-ruby

  16. Demo

  17. https://unvt.github.io/zfxy-ruby/

  18. 50cm GSD at z=26 https://x.optgeo.org/zfxy-ruby/#22.28/35.65779459/139.70209432/-85.5/60

  19. https://geolonia.github.io/zfxy/#8.14/35.431/138.612/-45.6/60

  20. https://github.com/geolonia/zfxy

  21. Temporal extension

  22. ZFXY: 3D extension to the tile-scheme {z}/{f}/{x}/{y}/{t} z: zoom index,

    f: height index, x: west-east index, y: north-south index, t: temporal index
  23. t: temporal index, or pomodoro code Time.now.to_i / 1800

  24. Motivation of UNVT Community to join We need data to

    prove the value of ZFXY. We are happy to build prototypes with your data.
  25. None
  26. None