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首页> 外文期刊>Geoscience and Remote Sensing, IEEE Transactions on >Temporal Stability of X-Band Single-Pass InSAR Heights in a Spruce Forest: Effects of Acquisition Properties and Season
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Temporal Stability of X-Band Single-Pass InSAR Heights in a Spruce Forest: Effects of Acquisition Properties and Season

机译：云杉林中X波段单程InSAR高度的时间稳定性：采集特性和季节的影响

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We investigated the stability of TanDEM-X interferometric synthetic aperture radar (InSAR) heights across eight repeated acquisitions. With InSAR height we mean the height above ground of the scattering phase center. We obtained InSAR heights by subtracting a digital terrain model generated from airborne laser scanning. The acquisitions varied in polarization, normal baseline, and season. The study area was a spruce forest in southeastern Norway. We established 179 field plots within 26 selected forest stands and obtained aboveground biomass (AGB) from field inventory. The InSAR heights were generally stable across the acquisitions as was the relationship between AGB and InSAR height, although systematic and random variations were noted. Two acquisitions had close-to-identical technical properties and weather conditions, and they produced close-to-identical InSAR heights. InSAR heights were fairly stable across a range in temperature and precipitation through spring, summer, and autumn, across a range in baseline values and for both HH and VV polarizations. However, a winter acquisition at temperatures of $-7 ^{circ}hbox{C}$ had much deeper penetration into the canopy and generated considerably lower InSAR heights and, hence, a very different relationship with biomass. Higher random errors were noted in a cross-pol data set due to lower backscatter and when the normal baseline was very small or very large. A height of ambiguity around 20–50 m appeared to be optimal. Interferometric X-band SAR can be used for monitoring coniferous boreal forests as long as the season and technical properties of the acquisition are kept within certain ranges.
机译：我们研究了八次重复采集中TanDEM-X干涉式合成孔径雷达（InSAR）高度的稳定性。对于InSAR高度，我们指的是散射相位中心离地面的高度。通过减去机载激光扫描生成的数字地形模型，我们获得了InSAR高度。采集结果在极化，正常基线和季节方面有所不同。研究区域是挪威东南部的云杉林。我们在26个选定的林分中建立了179个田地，并从田地清单中获得了地上生物量（AGB）。尽管注意到系统性和随机性差异，但在整个采集过程中，InSAR高度通常稳定，AGB和InSAR高度之间的关系也是如此。有两次收购具有接近于相同的技术特性和天气条件，并且它们产生了接近于相同的InSAR高度。 InSAR高度在整个春季，夏季和秋季的温度和降水范围，基线值范围以及HH和VV极化范围内都相当稳定。但是，在 $-7 ^ {circ} hbox {C} $ 温度下进行的冬季采集要深得多渗透到树冠中并产生较低的InSAR高度，因此与生物量的关系非常不同。由于较低的反向散射以及正常基线很小或很大时，在交叉极化数据集中发现较高的随机误差。大约20–50 m的歧义高度似乎是最佳的。只要采集的季节和技术特性保持在一定范围内，X波段干涉SAR可以用于监测针叶北方森林。

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