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Quantifying Libya-4 Surface Reflectance Heterogeneity With WorldView-1, 2 and EO-1 HyperionThe land surface imaging (LSI) virtual constellation approach promotes the concept of increasing Earth observations from multiple but disparate satellites. We evaluated this through spectral and spatial domains, by comparing surface reflectance from 30-m Hyperion and 2-m resolution WorldView-2 (WV-2) data in the Libya-4 pseudoinvariant calibration site. We convolved and resampled Hyperion to WV-2 bands using both cubic convolution and nearest neighbor (NN) interpolation. Additionally, WV-2 and WV-1 same-date imagery were processed as a cross-track stereo pair to generate a digital terrain model to evaluate the effects from large (>70 m) linear dunes. Agreement was moderate to low on dune peaks between WV-2 and Hyperion (R2 <; 0.4) but higher in areas of lower elevation and slope (R2 > 0.6). Our results provide a satellite sensor intercomparison protocol for an LSI virtual constellation at high spatial resolution, which should start with geolocation of pixels, followed by NN interpolation to avoid tall dunes that enhance surface reflectance differences across this internationally utilized site.
Document ID
20160005003
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Neigh, Christopher S. R.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
McCorkel, Joel
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Middleton, Elizabeth M.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
April 12, 2016
Publication Date
August 28, 2015
Publication Information
Publication: Geosciences and Remote Sensing Letters
Publisher: IEEE
Volume: 12
Issue: 11
ISSN: 1545-598X
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
GSFC-E-DAA-TN31261
Distribution Limits
Public
Copyright
Other
Keywords
Hyperion
Libya-4
Heterogeneity

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