Abstract
An operational scheme for masking cloud-contaminated pixels in Advanced Very High Resolution Radiometer (AVHRR) daytime data was developed, evaluated and presented. Dynamic thresholding was used with channel 1, 2 and 3 to automatically create a cloud mask for a single image. Then the 10-day cloud coverage imagery was generated over the whole Asian region along with cloud-free composite imagery. Finally the monthly based compiling was conducted based on the derived cloud coverage imagery in terms of land cover and country. As a result, it was found that 20-day is required to acquire the cloud free data over the whole asia using NOAA AVHRR. The 10-day cloud coverage and cloud free composite imagery derived in this research is available via the website http: //webpanda.iis.u-tokyo.ac.jp/CloudCover/.
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