沿岸域における大気上端からの放射輝度に及ぼす陸域反射光の影響計算アルゴリズム
書誌事項
- タイトル別名
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- The effect of land surface on the radiation emerging from the top of the atmosphere in the coastal zone.
抄録
An algorithm to derive the effect of the land surface on the emergent radiation from the top of the atmosphere in the coastal zone is proposed. The surface is simulated by checkerboard type of terrain composing pixels, either land or ocean. The Look-Up-Table method is used for the atmosphere-surface correction, where two parameters based on the diffuse transmission and reflection function of the atmosphere are introduced to investigate the contribution of adjacent pixels. These parameters are independent of the surface reflection properties. The ocean surface is in accordance with the Cox and Munk model surface, whereas that of land is assumed to be Lambertian. The upwelling radiation emerging from the top of the atmosphere is expressed by a sum of radiative interactions between surface and atmosphere, and it is calculated using these interactions until the sum is converged.<BR>An example of numerical simulation is shown at wavelength of 0.56μm, which corresponds to the center wavelength of the shortest channel of ASTER on EOS-AM 1. The dust like model is used for the aerosols, whereas the land surface albedo is 0.2 or 0.4. The ocean wind is 5 m/sec and the refractive index is 1.333. The effect of the land surface on the radiance over the ocean is stronger just off the coastal zone and decreases with the increase of distance away from the land exponentially. It depends upon the solar zenith angle and atmospheric condition as well. The present new version enable us quantitatively to discuss radiative transfer over the non-uniform composite surface including coastal zone.
収録刊行物
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- 日本リモートセンシング学会誌
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日本リモートセンシング学会誌 17 (4), 311-321, 1997
一般社団法人 日本リモートセンシング学会
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詳細情報 詳細情報について
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- CRID
- 1390282679644076928
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- NII論文ID
- 130003638484
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- ISSN
- 18831184
- 02897911
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可