Cloud-screening for Africa using a geographically and seasonally variable infrared threshold
| العنوان: | Cloud-screening for Africa using a geographically and seasonally variable infrared threshold |
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| المؤلفون: | V. L. Kalb, T. F. Eck |
| المصدر: | International Journal of Remote Sensing. 12:1205-1221 |
| بيانات النشر: | Informa UK Limited, 1991. |
| سنة النشر: | 1991 |
| مصطلحات موضوعية: | Meteorology, Infrared, Advanced very-high-resolution radiometer, Cloud cover, Atmospheric correction, Seasonality, Spatial distribution, medicine.disease, Altitude, Climatology, Radiative transfer, medicine, General Earth and Planetary Sciences, Environmental science |
| الوصف: | A spatially variable monthly, infrared cloud-threshold data base has been used to screen cloud-contaminated observations from radiances measured by the NOAA-9 AVHRR over Africa. Cloud-screening through a monthly average infrared threshold based on measured surface air temperature, which is geographically dependent, shows an improvement over using a seasonally and geographically independent thermal cloud threshold of 287 K. It is found that differences in cloud-screening for these two thresholds occur for cases of lower altitude clouds or subpixel clouds where the radiative temperature is higher than the 287 K infrared threshold, yet colder than the variable threshold developed by Stowe et al. (1988) for the Nimbus-7 global cloud climatology. The variable IR threshold is shown to be effective over persistently cloud-covered regions, such as the coastal region of the Gulf of Guinea, but may introduce some erroneous cloud identifications over mountains. |
| تدمد: | 1366-5901 0143-1161 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::7ba64707fed13b92f5116c8cfae271de https://doi.org/10.1080/01431169108929722 |
| رقم الأكسشن: | edsair.doi...........7ba64707fed13b92f5116c8cfae271de |
| قاعدة البيانات: | OpenAIRE |
PDF full text from Publisher | تدمد: | 13665901 01431161 |
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