2007 AGU Fall Meeting, December 10-14,San Francisco, CA
Spatial Prescreening Techniques for Earth Observation Data: Bounding Box vs G-Polygon
1Xin-Min Hua, 1Jianfu Pan, 2Gregory Leptoukh, 2Bruce Vollmer
1ADNET Systems. Inc., 164 Rollins Ave. Suite 303, Rockville, MD 20852, USA
2GSFC, NASA/GSFC Code 610.2, Greenbelt, MD 20771, USA
We compare the two methods widely used in defining geographical regions in satellite Earth observation data -- Bounding box and G-polygon. While G-polygon method is more accurate than bounding box, it is mathematically more complicated. We introduce a efficient and easy-to-use algorithm to define G-polygon regions. It is capable of handling most Terra and Aqua satellite data granules regardless of their locations on the Earth, with no special treatment required for dateline and pole crossing regions. It is easily adaptable to other problems where spatial prescreening and subsetting is desired.
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