Terrain, Art, Python and LiDAR

A talk I gave at PyCon US 2019

1. Terrain, Andrew Godwin @andrewgodwin Art, Python & LiDAR
2. Hi, I’m Andrew Godwin • Django contributor (Migrations/Channels) • Principle Engineer at • I always need more lasers
8. 1. Laser-cut profiles
9. DEM: Digital Elevation Model
11. 10 9 5 3 2 9 7 4 3 2 8 7 3 2 4 6 8 5 3 5 4 9 7 4 6 3 8 8 6 5 2 5 4 3 3 10 9 5 3 2 9 7 4 3 2 8 7 3 2 4 6 8 5 3 5 4 9 7 4 6 3 8 8 6 5 2 5 4 3 3
14. Loads the DEM as a CSV Picks one in N rows Draws a contour using svgwrite
17. 2. 3D-printed cities
22. (1, 3, 4) (6, 5, 11) (3, 7, -2)
23. POINT CLOUD → DIGITAL ELEVATION MAP (DEM) python-pcl lastools
25. Top surface Fully sealed 3D model (with the tile base)
27. Loads the DEM Clips height (top and bottom) Smooths rough features Writes out an STL file
28. (1, 3, 4) (6, 5, 11) (3, 7, -2)
29. How do you write STL? struct.pack( b"<ffffffffffffH", normal[0], normal[1], normal[2], x1, y1, z1, x2, y2, z2, x3, y3, z3, 0, )
30. Should I have used NumPy? Yes. Did I use NumPy? Err, no.
31. github.com/andrewgodwin/lidartile
34. 3. CNC-milled National Parks
37. Take the US National DEM Get the outline of the National Park Use QGIS to cut out a park-only DEM https://viewer.nationalmap.gov https://catalog.data.gov/dataset/national-park-boundariesf0a4c Toolbox > GDAL > Clip By Extent
38. Irregular shapes!
40. MAP PROJECTIONS
42. Things I Won't Work With Unicode Names Timezones Currencies Networks Addresses Dioxygen Difluoride
43. Things I Won't Work With Unicode Names Timezones Currencies Networks Addresses Dioxygen Difluoride Map Projections
45. 4. The Future
46. More US National Parks I do each one as I visit it. There are… 59.
47. Easier Milling 8 hours per piece. Really.
48. Better STL optimisation Millions of polygons isn't great.
49. Personal LiDAR Thanks, autonomous vehicles!
50. github.com/andrewgodwin/lidartile github.com/andrewgodwin/gis_tools
52. Thanks. Andrew Godwin @andrewgodwin aeracode.org