A comparison of conventional and geostatistical methods to replace clouded pixels in NOAA-AVHRR images

被引:34
作者
Addink, EA
Stein, A
机构
[1] Wageningen Agr Univ, Dept Geoinformat Proc & Remote Sensing, NL-6700 AH Wageningen, Netherlands
[2] Wageningen Agr Univ, Dept Environm Sci, NL-6700 AA Wageningen, Netherlands
关键词
D O I
10.1080/014311699213028
中图分类号
TP7 [遥感技术];
学科分类号
081102 ; 0816 ; 081602 ; 083002 ; 1404 ;
摘要
The potential of using National Oceanic and Atmospheric Administration (NOAA) Advanced Very High Resolution Radiometer (AVHRR) images for large areas is often limited by cloud cover. It could be increased when small clouds are replaced by estimated reflection and emission values. In this study seven replacement methods are compared, ranging from simple replacement to stratified co-kriging. Images of subsequent days serve as co-variable, enabling the use of spatial and temporal information. For validation, cloud-free pixels were replaced with four patterns of artificially clouded pixels. Co-kriging as a combination of both temporal and spatial information resulted in the best estimates, reducing the mean squared errors by 20-70%. Stratification of the image did not result in better cloud replacement. Once kriging options have been implemented in existing image processing packages, co-kriging will be an easy-to-use solution to missing values, provided that images of subsequent days of low cloud coverage are available.
引用
收藏
页码:961 / 977
页数:17
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