Investigation of Cloud Coverage Statistics in Asia Using NOAA AVHRR Time Series
نویسنده
چکیده
In order to compute cloud coverage statistics over Asian region, an operational scheme for masking cloud-contaminated pixels in Advanced Very High Resolution Radiometer (AVHRR) daytime data was developed, evaluated and presented. Dynamic threshold 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 statistics were computed 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 entire Asian region using NOAA AVHRR. The 10-day cloud coverage and cloud-free composite imagery derived in this research is available via the web-site http://webpanda.iis.utokyo.ac.jp/CloudCover/.
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