Mapping directional emissivity at 3.7 μ m using a simple model of bi-directional reflectivity
| Autor: | Françoise Nerry, M.-P. Stoll, F. Petitcolin |
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| Rok vydání: | 2002 |
| Předmět: | |
| Zdroj: | International Journal of Remote Sensing. 23:3443-3472 |
| ISSN: | 1366-5901 0143-1161 |
| DOI: | 10.1080/01431160110075569 |
| Popis: | Algorithms for Land Surface Temperature determination from satellite data need incorporating pixel-wise emissivity values to take care of the variability of this parameter over land and achieve a high accuracy in the surface emissivity. This parameter should be determined at the pixel scale and thus directly from the sensor's data. This work addresses the issue of extracting the land emissivity from AVHRR data. The necessary emissivity-temperature decoupling is achieved thanks to a method (Becker and Li 1990) that uses a combination of day/night channels 3, 4 and 5 data. Single channel atmospheric corrections are performed using MODTRAN and atmospheric profiles from outputs of GCMs (MeteoFrance AVISO database). The channel 3 emissivity is extracted in two steps: first the channel 3 bi-directional reflectivity is retrieved using the emissivity-temperature decoupling; second, emissivity is related to the reflectivity thanks to Kirchoff's relation. Accuracy assessment indicates that the expected overall erro... |
| Databáze: | OpenAIRE |
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