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Using Open Source Programming with Satellite Imagery
Claire Porter
Polar Geospatial Center
University of Minnesota
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1. Electro-optical high-resolution commercial satellite imagery
2. PGC’s open source approach: GDAL and Python
3. Applications to other datasets
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high-res imagery
• High-resolution Commercial Satellite Imagery in ice-covered regions
– 0.5m – 4m resolution
– 1 to 8 electro-optical bands
– Passive sensors
– High temporal resolution
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high-res imagery
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Fuel Cache
Imagery ©2011 Digital Globe, Inc.
overland traverses
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Imagery ©2012 Digital Globe, Inc.
field camp monitoring
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icebreaker operations
1000 m Imagery ©2012 Digital Globe, Inc.
Icebreaker
McMurdo Station
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landing site reconnaissance
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landing site reconnaissance
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100 m
geologic mapping
Imagery ©2012 Digital Globe, Inc.
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emperor penguin census
Imagery ©2012 Digital Globe, Inc.
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weddell seal counts
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elevation from stereoscopic images
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feature tracking
200m
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imagery challenges
• Challenges of the imagery
– Organization
• Over 500,000 images in polar regions
• Cataloging and space requirements
– Format
• Basic spatial location – not terrain corrected
• Uncorrected DN values
• 16 bit
• NITF format
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open source tools
• GDAL and Python
• Open source and freely available
• Large user base, well established and well maintained
– GDAL
• Libraries and standalone utilities
• Built with C++
• Becoming incorporated into other GIS packages
• Both raster and vector libraries
• Very good coordinate system support
• Bindings to Python, Ruby, Java, .NET, Perl, etc.
– Python
• GDAL Python bindings include Numpy/Scipy
• Benefits of GDAL with intuitive Python language
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open source tools
• What you can do:
– Organization
• Query rasters and vectors for geometry and metadata
• Write info to a spatial database or vector format
• Rename and archive imagery
– Manipulation
• Orthorectify, project, and manipulate imagery
• Stack bands, pan-sharpen, mosaic, or subset multiple images
• Run the package on a linux cluster for batch processing
• Easily schedule cron jobs for repeat updates
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imagery catalog
• Example 1: PGC imagery catalog
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imagery processor
Input Image DEM (optional)
gdalwarp : orthorectify with RPCs
gdal_translate and gdal_merge or VRT: rescale and stretch
RPCs (if external)
VRT
Reflectance Info
gdal_translate: write to output format
Output Image
gdaladdo: compute pyramids (if geoTiff)
• Example 2: PGC image orthorectification script
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radiometric correction
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radiometric correction
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Imagery Copyright Geoeye, Inc.
radiometric correction
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mosaics
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GDAL script by Dan Stahlke, GINA Imagery Copyright 2011 Digital Globe, Inc.
pan-sharpening
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GDAL script by Dan Stahlke, GINA Imagery Copyright 2011 Digital Globe, Inc.
pan-sharpening
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other applications
• Mosaics, Reprojection, and Subsetting: Rapidice.org
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