Title :
Nonparametric detection of cloudy pixels in AVHRR NDVI data
Author :
Anantharaj, Valentine G. ; Younan, Nicolas H. ; King, Roger L.
Author_Institution :
GeoResources Inst., Mississippi State Univ., MS, USA
Abstract :
Two nonparametric detectors, based on the Sign Test and the Wilcoxon Signed Rank Test, were applied to 10-day composites of Normalized Difference Vegetation Index (NDVI) data to detect cloud contaminated pixels. The performances of these detectors were found to be no better than a detector based on randomly chosen thresholds. The detector thresholds need to account for the climatologically induced biases in the data for each region and time period every year.
Keywords :
clouds; radiometry; vegetation mapping; AVHRR data; Advanced Very High Resolution Radiometer; NDVI data; Normalized Difference Vegetation Index; Sign Test; Wilcoxon Signed Rank Test; climatologically induced bias; cloud contaminated pixel detection; detector threshold; nonparametric detection; region-time period; Aerosols; Clouds; Detectors; Independent component analysis; Instruments; Ocean temperature; Satellite broadcasting; Terrestrial atmosphere; Testing; Vegetation mapping;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 2004. IGARSS '04. Proceedings. 2004 IEEE International
Print_ISBN :
0-7803-8742-2
DOI :
10.1109/IGARSS.2004.1368588
