Effects of Forest Biomass and Stand Consolidation on P-Band Backscatter
Effects of Forest Biomass and Stand Consolidation on P-Band Backscatter
复制标题
森林生物量和林分固结对 P 波段后向散射的影响
DOI：
--
复制
发表时间：
2007
影响因子：
4.8
通讯作者：
L. Ulander
中科院分区：
文献类型：
--
作者：
G. Smith;K. Folkesson;B. Hallberg;L. Ulander
在以前的研究中，P波段合成孔径雷达（SAR）显示出在森林生物量恢复的潜力。然而，虽然测量结果表明，后向散射随着生物量的增加而增加，但不同的研究表明，生物量相似的林分的后向散射可能会因森林结构而显着不同，因此使生物量检索更具挑战性。在这封信中，我们表明，虽然生物量可能是一个最重要的参数，确定从森林的后向散射，树木的数量密度也有重大影响。这可以解释使用简单的参数，导致我们提出使用的生物质固结指数来描述P波段HV偏振后向散射。这一点得到了电磁模拟研究和在加拿大BOREAS试验场上空用AIRSAR系统对北方森林进行的一些测量的支持。
In previous studies, P-band synthetic aperture radar (SAR) has shown potential for biomass retrieval in forests. However, while measurements show a general agreement that backscatter increases with increasing biomass, different studies show that the backscatter from stands of similar biomass can significantly vary depending on forest structure, hence making biomass retrieval more challenging. In this letter, we show that, while biomass may be the single most important parameter determining the backscatter from a forest, the number density of trees has also a major impact. This can be explained using simple arguments, leading us to propose the use of the biomass-consolidation index to describe P-band HV-polarized backscatter. This is supported by electromagnetic-modeling studies and by a few measurements from boreal forest made with the AIRSAR system over the BOREAS test site in Canada.