Validation of MISR Bidirectional Reflectance over Southern Africa during SAFARI 2000
January 11, 2006
MISR observations of surface bidirectional reflectance over Sua Pan, Botswana, were intercompared with Goddard's airborne Cloud Absorption Radiometer and ground-based PARABOLA instruments during SAFARI 2000. This intercomparison was conducted on both a clear and hazy day to evaluate the atmospheric correction applied to the MISR satellite data to derive surface bidirectional reflectance, and over two different targets, a bright desert-like surface of the Sua Pan and a dark grassland that surrounds it. Results show that, for the grassland surface type, the BRF values from MISR in the blue, green and red channels, on both days, are within 5-10% of those obtained from CAR and PARABOLA data. Over the bright desert-like surface, better agreement was found for the clear day than for the hazy day, indicating that under hazy conditions over a bright-reflecting surface, small uncertainties in the retrieved aerosol properties may cause significant errors in the surface BRF retrieval. A paper describing these results by Wedad Abdou, Stuart Pilorz, Mark Helmlinger, James Conel, David Diner, Carol Bruegge, John Martonchik, Charles Gatebe, Michael King, and Peter Hobbs, has recently been accepted for publication in the IEEE Transactions on Geoscience and Remote Sensing.
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