Taming Terrain: Sculpting Geoscapes With LiDAR

A presentation I gave at Electromagnetic Field 2018

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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