them thar hills: shadin', texturin', blendin
TRANSCRIPT
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them thar hills
shadin’, texturin’, blendin’
Ross McDonald @mixedbredie
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Take one DEM
Intermap 10m DTM
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Add a colour gradient
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Make a hill shade
Note the hatching effect caused by live hill shade renderer
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Multiply blend
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What is texture shading?
An alternative shaded relief technique Based on fractional Laplacian algorithms Emphasises drainage network Highlights the visual hierarchy Developed by Leland Brown Open source under BSD 2-clause www.textureshading.com Mac and Win binaries, compile on Linux
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Take one DEM
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Workflow
Convert GeoTIFF to GridFloat gdal_translate –of EHdr –ot Float32 in.tif out.flt
Generate a texture ./texture 2/3 out.flt texture.flt
Export a GeoTIFF ./texture_image +2.0 texture.flt texture.tif
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Texture shaded DEM
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Coloured in
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Blended with hill shade
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Without texture shade
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Blender 3D
OS Terrain50 DTM See https://wanderingcartographer.wordpress.com/ for workflows
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Uses the BlenderGIS addon - https://github.com/domlysz/BlenderGIS
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Comparison
QGIS/GDAL Quick
Easy
QGIS Raster menu
QGIS Live renderer (press F7 in 2.16)
Render artefacts
Texture Shading Download required
Easy to use
Some prep needed (Float32 DEM)
Memory dependent
Nice effect
Use alone or blend
Blender Separate app Steep learning curve More prep needed (Int16 DEM) RAM/CPU/GPU dependent Slow but lovely Realistic lighting
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Inspiration
http://www.shadedrelief.com/ http://www.reliefshading.com/ https://wanderingcartographer.wordpress.com/ http://mapzilla-art.co.uk/ https://owenpowell.wordpress.com/ http://www.mapsmith.net/ https://somethingaboutmaps.wordpress.com/ https://cartoblography.wordpress.com/ http://christopherwesson.azurewebsites.net/