Biomass Estimation Over Tropical Rainforests Using GNSS-R On-Board The CyGNSS Microsatellites Constellation
Biomass Estimation Over Tropical Rainforests Using GNSS-R On-Board The CyGNSS Microsatellites Constellation
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使用 CyGNSS 微型卫星星座机载 GNSS-R 估算热带雨林的生物量
DOI：
10.1109/igarss.2019.8900213
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
M. Crosetto
中科院分区：
文献类型：
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作者：
H. Carreno;G. Luzi;M. Crosetto
本文对气旋全球导航卫星系统在刚果和亚马逊热带雨林上空进行的生物量研究飞行任务进行了性能评估。CYGNSS后缘TE与Avitabile ET的功能相关性艾尔利用ICESat/GLAS的冠层高度(CH)、SMAP的植被光学厚度(VOD)和偏振指数(PI)对AGB的泛热带数据进行了评估。主要目的是研究该系统对茂密森林冠层上生物量的敏感性。与经典单站雷达任务相比，该系统的潜在优势可能在于上升的植被覆盖增加了信号衰减，从而减少了相干散射分量σcoh，0。这一项只能在双基地雷达几何结构中收集。不考虑测量噪声，初步结果表明，使用TE可以估计刚果和亚马逊热带雨林在低海拔角度θe~[20，40]°的最高可达~400吨/公顷和~250吨/公顷。利用SMAP微波植被参数的分析表明：a)VOD在热带雨林上表现良好，b)PI可能取决于CH水平。
A performance assessment of the Cyclone Global Navigation Satellite System (CyGNSS) mission for biomass studies is presented in this paper over Congo and Amazon tropical rainforests. The functional correlation between CyGNSS-derived trailing edge TE and Avitabile et. al. Above Ground Biomass (AGB) pan-tropical data is evaluated using ICESat/GLAS-derived Canopy Height (CH), SMAP-derived Vegetation Optical Depth (VOD) and Polarization Index (PI). The main objective is to investigate the sensitivity of CyGNSS to biomass over dense forest canopies. The potential advantage of CyGNSS as compared to classical monostatic radar missions could rely on the increasing signal attenuation by the upwelling vegetation cover that reduces the coherent scattering component σcoh,0. This term can only be collected in a bistatic radar geometry. Ignoring measurement noise, preliminary results show that the use of TE allows to estimate AGB up to ~ 400 ton/ha and ~ 250 ton/ha over Congo and Amazon rainforests at low elevation angles θe~ [20, 40] °. The analysis using the SMAP-derived microwave vegetation parameters shows that: a) VOD performs well even over rainforests, and b) PI could depend on the CH levels.