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Taming Terrain: Sculpting Geoscapes With LiDAR
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Andrew Godwin
August 31, 2018
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Taming Terrain: Sculpting Geoscapes With LiDAR
A presentation I gave at Electromagnetic Field 2018
Andrew Godwin
August 31, 2018
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Transcript
Taming Terrain Sculpting geoscapes from LIDAR Andrew Godwin @andrewgodwin
Andrew Godwin / @andrewgodwin Hi, I’m Andrew Godwin • Python
programmer-at-large • Geodata enthusiast • Does not (yet) own LiDAR equipment
Andrew Godwin / @andrewgodwin
Andrew Godwin / @andrewgodwin
Andrew Godwin / @andrewgodwin
Andrew Godwin / @andrewgodwin 1. Data 2. Modelling 3. Fabrication
Andrew Godwin / @andrewgodwin 1. Elevation Data
Andrew Godwin / @andrewgodwin Can be either surface or terrain
(no buildings/plants) Digital Elevation Model
Andrew Godwin / @andrewgodwin Source: maps-for-free.com
Andrew Godwin / @andrewgodwin Hawai'i (ASTER GDEM)
Andrew Godwin / @andrewgodwin Radar
Andrew Godwin / @andrewgodwin Low resolution Needs large-ish antennas Long
distance
Andrew Godwin / @andrewgodwin LiDAR
Andrew Godwin / @andrewgodwin Light Detection And Ranging
Andrew Godwin / @andrewgodwin
Andrew Godwin / @andrewgodwin
Andrew Godwin / @andrewgodwin Very high resolution (cm range) Compact
devices (planes or vehicles) Short distances
Andrew Godwin / @andrewgodwin Free data in both point clouds
and DEMs! e.g. Environment Agency, USGIS
Andrew Godwin / @andrewgodwin data.gov.uk earthexplorer.usgs.gov
Andrew Godwin / @andrewgodwin 2. Processing
Andrew Godwin / @andrewgodwin "Point Cloud"
Andrew Godwin / @andrewgodwin Multiple returns Too much detail Noisy
Andrew Godwin / @andrewgodwin
Andrew Godwin / @andrewgodwin a. "Thin" point cloud b. Rasterise
point cloud to DEM c. Smooth results
Andrew Godwin / @andrewgodwin 3. Fabrication
Andrew Godwin / @andrewgodwin 3D Printing Laser Cutting Milling
Andrew Godwin / @andrewgodwin 3D Printing
Andrew Godwin / @andrewgodwin
Andrew Godwin / @andrewgodwin
Andrew Godwin / @andrewgodwin
Andrew Godwin / @andrewgodwin
Andrew Godwin / @andrewgodwin 4 - 12 unattended hours (per
15cm tile) Difficult to line up perfectly Has to print perfectly square!
Andrew Godwin / @andrewgodwin Milling
Andrew Godwin / @andrewgodwin
Andrew Godwin / @andrewgodwin
Andrew Godwin / @andrewgodwin
Andrew Godwin / @andrewgodwin 2 - 4 attended hours per
10cm piece Small features hard to mill CNC mills ain't cheap
Andrew Godwin / @andrewgodwin Laser Cutting
Andrew Godwin / @andrewgodwin
Andrew Godwin / @andrewgodwin
Andrew Godwin / @andrewgodwin
Andrew Godwin / @andrewgodwin 15 minutes to cut, 15 mins
to glue Only works for features surrounded by flat Limited detail
Andrew Godwin / @andrewgodwin What's next?
Andrew Godwin / @andrewgodwin Less human-intensive milling Better laser cut
feature highlighting 3D directly from point clouds Somehow getting a LiDAR scanner?!
Andrew Godwin / @andrewgodwin code: github.com/andrewgodwin/lidartile blog: aeracode.org videos: youtube.com/user/andrewgodwin
Thanks. Andrew Godwin @andrewgodwin aeracode.org