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Taming Terrain: Sculpting Geoscapes With LiDAR

Andrew Godwin
August 31, 2018
210

Taming Terrain: Sculpting Geoscapes With LiDAR

A presentation I gave at Electromagnetic Field 2018

Andrew Godwin

August 31, 2018
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Transcript

  1. Taming Terrain
    Sculpting geoscapes from LIDAR
    Andrew Godwin @andrewgodwin

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  2. Andrew Godwin / @andrewgodwin
    Hi, I’m
    Andrew Godwin
    • Python programmer-at-large
    • Geodata enthusiast
    • Does not (yet) own LiDAR equipment

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  3. Andrew Godwin / @andrewgodwin

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  4. Andrew Godwin / @andrewgodwin

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  5. Andrew Godwin / @andrewgodwin

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  6. Andrew Godwin / @andrewgodwin
    1. Data
    2. Modelling
    3. Fabrication

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  7. Andrew Godwin / @andrewgodwin
    1. Elevation Data

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  8. Andrew Godwin / @andrewgodwin
    Can be either surface or terrain (no buildings/plants)
    Digital Elevation Model

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  9. Andrew Godwin / @andrewgodwin
    Source: maps-for-free.com

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  10. Andrew Godwin / @andrewgodwin
    Hawai'i (ASTER GDEM)

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  11. Andrew Godwin / @andrewgodwin
    Radar

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  12. Andrew Godwin / @andrewgodwin
    Low resolution
    Needs large-ish antennas
    Long distance

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  13. Andrew Godwin / @andrewgodwin
    LiDAR

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  14. Andrew Godwin / @andrewgodwin
    Light Detection And Ranging

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  15. Andrew Godwin / @andrewgodwin

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  16. Andrew Godwin / @andrewgodwin

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  17. Andrew Godwin / @andrewgodwin
    Very high resolution (cm range)
    Compact devices (planes or vehicles)
    Short distances

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  18. Andrew Godwin / @andrewgodwin
    Free data in both point clouds and DEMs!
    e.g. Environment Agency, USGIS

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  19. Andrew Godwin / @andrewgodwin
    data.gov.uk
    earthexplorer.usgs.gov

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  20. Andrew Godwin / @andrewgodwin
    2. Processing

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  21. Andrew Godwin / @andrewgodwin
    "Point Cloud"

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  22. Andrew Godwin / @andrewgodwin
    Multiple returns
    Too much detail
    Noisy

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  23. Andrew Godwin / @andrewgodwin

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  24. Andrew Godwin / @andrewgodwin
    a. "Thin" point cloud
    b. Rasterise point cloud to DEM
    c. Smooth results

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  25. Andrew Godwin / @andrewgodwin
    3. Fabrication

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  26. Andrew Godwin / @andrewgodwin
    3D Printing
    Laser Cutting
    Milling

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  27. Andrew Godwin / @andrewgodwin
    3D Printing

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  28. Andrew Godwin / @andrewgodwin

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  29. Andrew Godwin / @andrewgodwin

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  30. Andrew Godwin / @andrewgodwin

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  31. Andrew Godwin / @andrewgodwin

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  32. Andrew Godwin / @andrewgodwin
    4 - 12 unattended hours (per 15cm tile)
    Difficult to line up perfectly
    Has to print perfectly square!

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  33. Andrew Godwin / @andrewgodwin
    Milling

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  34. Andrew Godwin / @andrewgodwin

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  35. Andrew Godwin / @andrewgodwin

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  36. Andrew Godwin / @andrewgodwin

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  37. Andrew Godwin / @andrewgodwin
    2 - 4 attended hours per 10cm piece
    Small features hard to mill
    CNC mills ain't cheap

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  38. Andrew Godwin / @andrewgodwin
    Laser Cutting

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  39. Andrew Godwin / @andrewgodwin

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  40. Andrew Godwin / @andrewgodwin

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  41. Andrew Godwin / @andrewgodwin

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  42. Andrew Godwin / @andrewgodwin
    15 minutes to cut, 15 mins to glue
    Only works for features surrounded by
    flat
    Limited detail

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  43. Andrew Godwin / @andrewgodwin
    What's next?

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  44. Andrew Godwin / @andrewgodwin
    Less human-intensive milling
    Better laser cut feature highlighting
    3D directly from point clouds
    Somehow getting a LiDAR scanner?!

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  45. Andrew Godwin / @andrewgodwin
    code: github.com/andrewgodwin/lidartile
    blog: aeracode.org
    videos: youtube.com/user/andrewgodwin

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  46. Thanks.
    Andrew Godwin
    @andrewgodwin aeracode.org

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