Estimating spruce and pine biomass with interferometric X-band SAR
Estimating spruce and pine biomass with interferometric X-band SAR
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DOI：
10.1016/j.rse.2010.05.011
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发表时间：
2010-10
影响因子：
13.5
通讯作者：
S. Solberg;R. Astrup;T. Gobakken;E. Næsset;D. Weydahl
中科院分区：
文献类型：
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作者：
S. Solberg;R. Astrup;T. Gobakken;E. Næsset;D. Weydahl
本研究的主要目的是探讨干涉X波段合成孔径雷达(InSAR)在北方森林生物量调查中的适用性。我们在挪威南部的一个研究区调查了SRTM X波段InSAR高度与地上生物量的关系。我们结合机载激光扫描(ALS)，从实地调查中为每个SRTM像素生成了生物量参考数据。一组森林调查样地用于校准基于ALS的生物量模型，另一组野外样地用于验证这些模型。在林分水平上，用这种方法获得的生物量高达250t/ha。生物量与InSAR高度呈线性关系，不存在明显的饱和效应，精度较高(RMSE=19%)。挪威云杉和苏格兰松之间的关系不同，InSAR高度每增加1m，生物量分别增加9.9t/ha和7.0t/ha。与使用地形图中的地形模型相比，使用ALS的高质量地形模型可以更准确地估计生物量。干涉X波段合成孔径雷达是一种很有前途的森林生物量监测方法。
The primary aim of this study was to investigate the suitability of interferometric X-band SAR (InSAR) for inventory of boreal forest biomass. We investigated the relationship between SRTM X-band InSAR height and above-ground biomass in a study area in southern Norway. We generated biomass reference data for each SRTM pixel from a field inventory in combination with airborne laser scanning (ALS). One set of forest inventory plots served for calibrating ALS based biomass models, and another set of field plots was used to validate these models. The biomass values obtained in this way ranged up to 250t/ha at the stand level. The relationship between biomass and InSAR height was linear, no apparent saturation effect was present, and the accuracy was high (RMSE=19%). The relationship differed between Norway spruce and Scots pine, where an increase in InSAR height of 1m corresponded to an increase in biomass of 9.9 and 7.0t/ha, respectively. Using a high-quality terrain model from ALS enabled biomass to be estimated with a higher accuracy as compared to using a terrain model from topographic maps. Interferometric X-band SAR appears to be a promising method for forest biomass monitoring.