A presentation I gave at Electromagnetic Field 2018
Taming TerrainSculpting geoscapes from LIDARAndrew Godwin @andrewgodwin
View Slide
Andrew Godwin / @andrewgodwinHi, I’mAndrew Godwin• Python programmer-at-large• Geodata enthusiast• Does not (yet) own LiDAR equipment
Andrew Godwin / @andrewgodwin
Andrew Godwin / @andrewgodwin1. Data2. Modelling3. Fabrication
Andrew Godwin / @andrewgodwin1. Elevation Data
Andrew Godwin / @andrewgodwinCan be either surface or terrain (no buildings/plants)Digital Elevation Model
Andrew Godwin / @andrewgodwinSource: maps-for-free.com
Andrew Godwin / @andrewgodwinHawai'i (ASTER GDEM)
Andrew Godwin / @andrewgodwinRadar
Andrew Godwin / @andrewgodwinLow resolutionNeeds large-ish antennasLong distance
Andrew Godwin / @andrewgodwinLiDAR
Andrew Godwin / @andrewgodwinLight Detection And Ranging
Andrew Godwin / @andrewgodwinVery high resolution (cm range)Compact devices (planes or vehicles)Short distances
Andrew Godwin / @andrewgodwinFree data in both point clouds and DEMs!e.g. Environment Agency, USGIS
Andrew Godwin / @andrewgodwindata.gov.ukearthexplorer.usgs.gov
Andrew Godwin / @andrewgodwin2. Processing
Andrew Godwin / @andrewgodwin"Point Cloud"
Andrew Godwin / @andrewgodwinMultiple returnsToo much detailNoisy
Andrew Godwin / @andrewgodwina. "Thin" point cloudb. Rasterise point cloud to DEMc. Smooth results
Andrew Godwin / @andrewgodwin3. Fabrication
Andrew Godwin / @andrewgodwin3D PrintingLaser CuttingMilling
Andrew Godwin / @andrewgodwin3D Printing
Andrew Godwin / @andrewgodwin4 - 12 unattended hours (per 15cm tile)Difficult to line up perfectlyHas to print perfectly square!
Andrew Godwin / @andrewgodwinMilling
Andrew Godwin / @andrewgodwin2 - 4 attended hours per 10cm pieceSmall features hard to millCNC mills ain't cheap
Andrew Godwin / @andrewgodwinLaser Cutting
Andrew Godwin / @andrewgodwin15 minutes to cut, 15 mins to glueOnly works for features surrounded byflatLimited detail
Andrew Godwin / @andrewgodwinWhat's next?
Andrew Godwin / @andrewgodwinLess human-intensive millingBetter laser cut feature highlighting3D directly from point cloudsSomehow getting a LiDAR scanner?!
Andrew Godwin / @andrewgodwincode: github.com/andrewgodwin/lidartileblog: aeracode.orgvideos: youtube.com/user/andrewgodwin
Thanks.Andrew Godwin@andrewgodwin aeracode.org