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首页> 外文会议>Geoscience and Remote Sensing Symposium, 1994. IGARSS '94. Surface and Atmospheric Remote Sensing: Technologies, Data Analysis and Interpretation., International >Forest modeling of jack pine trees for BOREAS
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Forest modeling of jack pine trees for BOREAS

机译：BOREAS杰克松树的森林建模

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As part of the intensive field campaign (IFC) for the Boreal forest ecosystem-atmosphere research (BOREAS) project in August 1993, the NASA/JPL AIRSAR covered an area of about 100 km/spl times/100 km near the Prince Albert National Park in Saskatchewan, Canada. At the same time, ground-truth measurements were made in several stands which have been selected as the primary study sites, as well as in some auxiliary sites. This paper focuses on an area including jack pine stands in the Nipawin area near the park. Upon examining the SAR data from stands of old and young jack pine (OJP and YJP) it is observed that the OJP stand produces HH backscatter at P-band which is significantly higher than that from YJP. The OJP trees are taller and have larger diameters, but are much more sparse than the YJP trees. The YJP trees, on the other hand, have denser and greener crown layer. The radar backscatter values for VV polarization and at other frequencies do not manifest such a large difference. For HV backscatter, although P-band return is again larger than C- and L-bands, the difference is not as marked. To explain this distinct signature of OJP stands, a forest scattering model is used in conjunction with the ground-truth measurements. The forest model includes the major scattering mechanisms (volume, double-bounce, and single-bounce) by taking the forest component interactions into account. The contribution from each of the scattering mechanisms to the total backscatter is calculated and their differences for OJP and YJP stands are evaluated. The results are used to discuss the effect of the physical properties of the forest components in each stand on radar backscatter, in particular, for HH polarization at P-band.
机译：作为1993年8月进行的北方森林生态系统-大气研究（BOREAS）项目的密集野外运动（IFC）的一部分，NASA / JPL AIRSAR覆盖了约100 km / spl乘以/ 100 km，靠近阿尔伯特亲王国家公园在加拿大萨斯喀彻温省。同时，在几个被选为主要研究地点的看台以及一些辅助地点进行了地面真相测量。本文的重点是公园附近Nipawin地区的一个区域，其中包括千斤顶松林。通过检查来自古老和年轻杰克松（OJP和YJP）林分的SAR数据，可以观察到OJP林分在P波段产生HH背向散射，远高于YJP。 OJP树较高且直径较大，但比YJP树稀疏得多。另一方面，YJP树的树冠层更浓密，绿色。 VV极化和其他频率下的雷达反向散射值差异不大。对于HV背向散射，尽管P波段返回值再次大于C波段和L波段，但差异并不明显。为了解释OJP林分的这种独特特征，将森林散射模型与地面真相测量结合使用。通过考虑森林成分的相互作用，森林模型包括主要的散射机制（体积，双反射和单反射）。计算每种散射机制对总反向散射的贡献，并评估OJP和YJP支架的差异。结果用于讨论每个林分中森林成分的物理特性对雷达反向散射的影响，特别是对于P波段的HH极化。

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