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| A kernel-driven model of effective directional emissivity fornon-isothermal surfaces | |
| 引用本文： | SU Lihong,LI Xiaowen,Mark FRIEDL,Alan STRAHLER,GU Xingfa. A kernel-driven model of effective directional emissivity fornon-isothermal surfaces[J]. 自然科学进展(英文版), 2002, 12(8): 603-607 |
| 作者姓名： | SU Lihong LI Xiaowen Mark FRIEDL Alan STRAHLER GU Xingfa |
| 作者单位： | Research Center for Remote Sensing and Department of Geography, Beijing Normal University, Beijing 100875, China,Research Center for Remote Sensing and Department of Geography, Beijing Normal University, Beijing 100875, China;Department of Geography and Center for Remote Sensing, Boston University, Boston MA 02215, U.S.A.,Department of Geography and Center for Remote Sensing, Boston University, Boston MA 02215, U.S.A.,Department of Geography and Center for Remote Sensing, Boston University, Boston MA 02215, U.S.A.,INRA, Bioclimatologie, 84914, Avignon, France |
| 基金项目： | Supported by the Major State Basic Research Development Program of China (G2000077900), the National Natural Science Foundation of China (Grant No. 49971059), and USA NASA (NAG5-7217, NAG5-31369) |
| 摘 要： | Land surface temperature (LST) is a key geophysical parameter that reflects the combined effects of land surface energy and radiation balance. Remote sensing of LST, however, requires understanding the directional patterns of thermal emission from heterogeneous land surfaces. Recently, semi-empirical, linear, kernel-driven models have been successfully used to describe observed directional patterns of land surface reflectance. Following a similar methodology and based on a recent model of the physics of directional thermal emission from heterogeneous land surfaces, a kernel-driven semi-empirical model for thermal emission is developed using three kernels: (i) an isotropic kernel, corresponding to the gray-body component in a heterogeneous pixel; (ii) a two-layer canopy kernel, derived from a previous conceptual model; and (iii) a geometric optical kernel that accounts for the fact that sunlit parts are hotter than shaded parts in a pixel. The three-kernel model fits 1997 airborne directional thermal brightness data over Avignon, France, very well. |
| 关 键 词： | non-isothermal pixel directional thermal emission kernel-driven model |
A kernel-driven model of effective directional emissivity fornon-isothermal surfaces |
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| Su Lihong,LI Xiaowen,Mark FRIEDL,Alan STRAHLER,GU Xingfa. A kernel-driven model of effective directional emissivity fornon-isothermal surfaces[J]. Progress in Natural Science, 2002, 12(8): 603-607 | |
| Authors: | Su Lihong LI Xiaowen Mark FRIEDL Alan STRAHLER GU Xingfa |
| Affiliation: | 1. Research Center for Remote Sensing and Department of Geography, Beijing Normal University, Beijing 100875, China 2. Research Center for Remote Sensing and Department of Geography, Beijing Normal University, Beijing 100875, China;Department of Geography and Center for Remote Sensing, Boston University, Boston MA 02215, U.S.A. 3. Department of Geography and Center for Remote Sensing, Boston University, Boston MA 02215, U.S.A. 4. INRA, Bioclimatologie, 84914, Avignon, France |
| Abstract: | Land surface temperature (LST) is a key geophysical parameter that reflects the combined effects of land surface energy and radiation balance. Remote sensing of LST, however, requires understanding the directional patterns of thermal emission from heterogeneous land surfaces. Recently, semi-empirical, linear, kernel-driven models have been successfully used to describe observed directional patterns of land surface reflectance. Following a similar methodology and based on a recent model of the physics of directional thermal emission from heterogeneous land surfaces, a kernel-driven semi-empirical model for thermal emission is developed using three kernels: (i) an isotropic kernel, corresponding to the gray-body component in a heterogeneous pixel; (ii) a two-layer canopy kernel, derived from a previous conceptual model; and (iii) a geometric optical kernel that accounts for the fact that sunlit parts are hotter than shaded parts in a pixel. The three-kernel model fits 1997 airborne directional thermal brightness data over Avignon, France, very well. |
| Keywords: | non-isothermal pixel directional thermal emission kernel-driven model |
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