Oskin, et al., in review - San Diego Supercomputer Center · Topographic differencing J Ramón...
Transcript of Oskin, et al., in review - San Diego Supercomputer Center · Topographic differencing J Ramón...
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Topographic differencing
J Ramón Arrowsmith School of Earth and Space Exploration Arizona State University Christopher J. Crosby UNAVCO
Tutorial notes (April 2016)
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El Mayor Cucupah earthquake rupture laser scan
100 m
Oskin, et al., in review
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Photo by Tom Rockwell
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Oskin, et al., Complex surface rupture of the El Mayor-Cucapah earthquake imaged with airborne lidar: Science, 2012 INEGI pre-event-NCALM post event
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Pick a small piece of the data
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Two datasets PRE and POST
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Pick a small piece of the data
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PRE
POST—manual entry
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Run both the pre and the post datasets at 1 m; generate additional KMZ files Download all products, but save to separate pre and post folders
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Can look at the hillshades in Google Earth
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Can look at the hillshades in Google Earth
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Open in Cloud Compare but don’t translate them
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Post Pre Point Density: 0.02 pts/m2
Point Density: 9.12 pts/m2
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Subsample the clouds
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Compute Cloud to Cloud difference
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Filter to just 0-5 m range
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Cloud to cloud absolute differences
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Cloud to cloud absolute differences Z component
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Can do some of this in ArcMap for vertical differencing (Raster Calc.)