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ZFXY: a 3D spatio-temporal tiling scheme proposal for optimized data access
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Hidenori FUJIMURA
March 16, 2022
Technology
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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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Transcript
ZFXY: a 3D spatio-temporal tiling scheme proposal for optimized data
access Hidenori (UN Vector Tile Toolkit / Geospatial Information Authority of Japan)
Introduction of background: 3D geospatial projects in Japan
GSI secured budget for point cloud data (regular budget [2
million USD] + external supplementary budget)
Shizuoka Prefecture is completing provision of point cloud data as
Open Data
City Bureau of MLIT has been leading 3D city modeling
throuh Project PLATEAU
Tokyo Metropolitan Government started Tokyo Digital Twin Project
3D Spatial Information Infrastructure project led by Ministry of Economy,
Trade, and Industry / IPA DADC
Civic, humanitarian, and educational project: DRONEBIRD led by Taichi -
3D point cloud from photogrammetry
Our UNVT colleague Takayuki appointed in 3D spatial information infrastructure
design committee by IPA DADC.
UNVT Community is working on: How can we optimize access
to 3D geospatial data?
Tile: industry standard in web maps {z}/{x}/{y} z: zoom index,
x: west-east index, y: north-south index
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
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].
https://github.com/unvt/zfxy-spec
https://github.com/unvt/zfxy-ruby
Demo
https://unvt.github.io/zfxy-ruby/
50cm GSD at z=26 https://x.optgeo.org/zfxy-ruby/#22.28/35.65779459/139.70209432/-85.5/60
https://geolonia.github.io/zfxy/#8.14/35.431/138.612/-45.6/60
https://github.com/geolonia/zfxy
Temporal extension
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
t: temporal index, or pomodoro code Time.now.to_i / 1800
Motivation of UNVT Community to join We need data to
prove the value of ZFXY. We are happy to build prototypes with your data.
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