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首页> 外文会议>Geoscience and Remote Sensing Symposium, 1996. IGARSS '96. 'Remote Sensing for a Sustainable Future.', International >Sensitivity of modeled C-band backscatter from loblolly pine forests to surface soil roughness and moisture
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Sensitivity of modeled C-band backscatter from loblolly pine forests to surface soil roughness and moisture

机译：火炬松森林C波段反向散射对表层土壤粗糙度和水分的敏感性

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The authors investigated effects of surface-related scattering on C-band radar backscatter in loblolly pine forests at Duke Forest, North Carolina. Five loblolly pine stands, aged from 8 to over 60 years old, were used. Stand density ranged from 589 trees/ha to 5505 trees/ha, and mean tree trunk diameter at breast height (dbh) was between 0.10 m and 0.27 m. The authors used the ratio of the modeled total backscatter to modeled canopy scattering (T/C) to evaluate the importance of ground surface-related scattering. C-band backscatter at 20/spl deg/, 30/spl deg/, and 40/spl deg/ incidence angles (/spl theta/o) was simulated for the stands. C-HH and C-VV backscatter showed modest sensitivity to the surface-related scattering in the young stand (8 years old) at /spl theta//sub 0/ of 20/spl deg/ and 30/spl deg/, and in a mid-aged stand (25 years old) at /spl theta//sub 0/ of 20/spl deg/. C-HV backscatter was somewhat sensitive to surface scattering in the young stand at /spl theta//sub 0/=20/spl deg/. In the other cases, C-band backscatter was not sensitive. The changes in C-band T/C ratios due to surface scattering occurred only in the young and mid-aged stands. As incidence angle increased, the maxima of T/C ratios decreased for all stands, a consequence of the larger relative contribution of canopy scattering to total backscatter at large /spl theta//sub 0/ than at small /spl theta//sub 0/.
机译：作者研究了北卡罗来纳州杜克森林的松树森林表面相关散射对C波段雷达反向散射的影响。使用了5个8至60岁以上的火炬松林。林分密度在589棵树/公顷至5505棵树/公顷的范围内，在胸高（dbh）处的平均树干直径在0.10 m至0.27 m之间。作者使用建模的总反向散射与建模的树冠散射（T / C）之比来评估与地面相关的散射的重要性。模拟了支架在20 / spl deg /，30 / spl deg /和40 / spl deg /入射角（/ spl theta / o）时的C波段反向散射。 C-HH和C-VV背向散射对年轻林分（8岁）中/ spl theta // sub 0 /分别为20 / spl deg /和30 / spl deg /以及/ spl theta // sub 0 /为20 / spl deg /的中年展位（25岁）。在/ spl theta // sub 0 / = 20 / spl deg /下，C-HV背向散射对年轻林中的表面散射有些敏感。在其他情况下，C波段反向散射不敏感。由于表面散射造成的C波段T / C比的变化仅发生在中青年林分中。随着入射角的增加，所有林分的T / C比最大值减小，这是大/ spl theta // sub 0 /下冠层散射对总反向散射的相对贡献比小/ spl theta // sub 0更大的结果/。

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