The influence of Sentinel-1 SAR sub-swath on the recorded backscatter time-series over managed hemiboreal forests

Q4 Agricultural and Biological Sciences
Mait Lang, J. Praks
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引用次数: 0

Abstract

Abstract The view angle range of Sentinel-1 SAR in the Interferometric Wide swath (IW) measurement mode is 29.1° – 46.0°. The dependence of backscatter on the arbitrary local incidence angle is usually corrected using a linear regression model where the incidence angle is a predictor variable. We analysed the whole time series of Sentinel-1 SAR VV-polarised backscatter over the flat 15×15 km test site in Laeva, Estonia (26° 26′ 43″ E; 58° 31′ 56″ N). Time series containing measurements from three different orbits were constructed for 3,159 stands from nighttime data and for 1,105 stands from daytime data. We can confirm that daytime backscatter is systematically greater than nighttime backscatter. We found a significant deviation from linearity in the backscatter dependence on local incidence angle. The empirical finding may be caused by the microwave scattering dependence on local incidence angle or by the influence of Sentinel-1 SAR sub-swath configuration in the Terrain Observation with Progressive Scans SAR (TOPSAR) method that is used for the measurements.
Sentinel-1 SAR子带对人工管理半针叶林后向散射时间序列的影响
摘要Sentinel-1 SAR在干涉宽幅测量模式下的视角范围为29.1°~ 46.0°。后向散射对任意局部入射角的依赖通常使用线性回归模型进行校正,其中入射角是一个预测变量。我们分析了Sentinel-1 SAR vv偏振后向散射在爱沙尼亚Laeva平坦15×15 km试验场(26°26′43″E;58°31 ' 56″N)。时间序列包含三个不同轨道的测量数据,其中3159个观测点的夜间数据和1105个观测点的日间数据。我们可以确认,白天的反向散射在系统上大于夜间的反向散射。我们发现后向散射对局部入射角的依赖与线性有很大的偏差。这一经验发现可能是由于微波散射对局部入射角的依赖,也可能是由于用于测量的地形观测逐级扫描SAR (TOPSAR)方法中Sentinel-1 SAR子条配置的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Forestry Studies
Forestry Studies Agricultural and Biological Sciences-Forestry
CiteScore
0.70
自引率
0.00%
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0
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