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Terrain, Art, Python and LiDAR
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Andrew Godwin
May 03, 2019
Programming
1
410
Terrain, Art, Python and LiDAR
A talk I gave at PyCon US 2019
Andrew Godwin
May 03, 2019
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Transcript
Terrain, Andrew Godwin @andrewgodwin Art, Python & LiDAR
Hi, I’m Andrew Godwin • Django contributor (Migrations/Channels) • Principle
Engineer at • I always need more lasers
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1. Laser-cut profiles
DEM: Digital Elevation Model
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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
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Loads the DEM as a CSV Picks one in N
rows Draws a contour using svgwrite
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2. 3D-printed cities
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(1, 3, 4) (6, 5, 11) (3, 7, -2)
POINT CLOUD → DIGITAL ELEVATION MAP (DEM) python-pcl lastools
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Top surface Fully sealed 3D model (with the tile base)
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Loads the DEM Clips height (top and bottom) Smooths rough
features Writes out an STL file
(1, 3, 4) (6, 5, 11) (3, 7, -2)
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, )
Should I have used NumPy? Yes. Did I use NumPy?
Err, no.
github.com/andrewgodwin/lidartile
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3. CNC-milled National Parks
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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
Irregular shapes!
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MAP PROJECTIONS
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Things I Won't Work With Unicode Names Timezones Currencies Networks
Addresses Dioxygen Difluoride
Things I Won't Work With Unicode Names Timezones Currencies Networks
Addresses Dioxygen Difluoride Map Projections
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4. The Future
More US National Parks I do each one as I
visit it. There are… 59.
Easier Milling 8 hours per piece. Really.
Better STL optimisation Millions of polygons isn't great.
Personal LiDAR Thanks, autonomous vehicles!
github.com/andrewgodwin/lidartile github.com/andrewgodwin/gis_tools
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Thanks. Andrew Godwin @andrewgodwin aeracode.org