Title :
AMSR-E Data Resampling With Near-Circular Synthesized Footprint Shape and Noise/Resolution Tradeoff Study
Author :
Gu, Haoyu ; England, Anthony W.
Author_Institution :
Univ. of Michigan, Ann Arbor
Abstract :
An improved Backus-Gilbert resampling scheme is developed and applied on Advanced Microwave Scanning Radiometer-EOS (AMSR-E) brightness temperature swath data. The new resampling scheme has two improvements over the special sensor microwave imager and AMSR-E resampling schemes currently used to produce standard brightness products. First, the use of a circular Gaussian footprint as the reference footprint achieves near-circular synthesized footprints for all channels. The near-circular synthesized footprints diminish the effect of different orientations of the synthesized elliptical footprints produced by the standard algorithm. Second, a better synthesized footprint spatial resolution for the 6.925- and 10.65-GHz channels in the across scan direction is achieved with a significant reduction in noise level. Oversampling by AMSR-E at these frequencies enables this improvement.
Keywords :
geophysical signal processing; geophysical techniques; image sampling; microwave imaging; microwave measurement; radiometry; remote sensing; AMSR-E data resampling; Advanced Microwave Scanning Radiometer-EOS; Backus-Gilbert resampling; brightness temperature swath data; circular Gaussian footprint; frequency 10.65 GHz; frequency 6.925 GHz; image processing; microwave imager; near-circular synthesized footprint shape; noise level reduction; noise-resolution tradeoff; synthesized elliptical footprint; synthesized footprint spatial resolution; Brightness temperature; Image sensors; Information retrieval; Microwave radiometry; Noise shaping; Satellite broadcasting; Satellite ground stations; Sea surface; Shape; Spatial resolution; Image processing; microwave radiometry;
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
DOI :
10.1109/TGRS.2007.895412