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Mapping Mars Chris Herwig, MapBox [email protected] @hrwgc

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Image by Image Editor on Flickr Space

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Image credit: NASA/JPL-Caltech Mars Curiosity

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Design ● How to map a planet you've never seen ● Accuracy vs intelligibility ● What color is Mars natively? ○ red planet ○ atmosphere ○ perspective ● Projection, projection... Image: Layers in Aonia Terra NASA/JPL/University of Arizona

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Global mosaic of Mars NASA NSSDC Photo Gallery

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Hubble RGB Composite Image from NASA NSSDC Photo Gallery

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Maps

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Elevation Data Mars Orbiter Laser Altimeter (MOLA) ● Instrument on the Mars Global Surveyor ● Measures time it takes for a beam of light sent from MOLA to reflect off the surface. ● Data access available through USGS' Planetary Interactive G.I.S.-on-the- Web Analyzable Database (PIGWAD) Image credit: NASA/JPL-Caltech

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Tools Used ● GDAL: gdal.org ● QGIS: qgis.org ● TileMill: mapbox.com/tilemill ● MapBox: mapbox.com/ ● U.S.G.S. Planetary GIS Web Server: webgis.wr. usgs.gov/

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Workflow 1. gdaldem color-relief 2. gdaldem hillshade 3. gdaldem slope + gdaldem color-relief for slope shading 4. gdalwarp 1, 2, and 3 to Google Mercator 5. Use TileMill with new Mapnik compositing features to combine color- relief, hillshade, and slope shading.

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Raster compositing in TileMill

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Visit Mars Twitter: @hrwgc Email: [email protected] Questions? hrwgc.github.com/planets