在全球变暖和人类活动的双重作用下，位于青藏高原腹地的青藏工程走廊多年冻土区段多年冻土退化强烈，从而引发了一系列病害问题，这为位于其内的青藏公路、青藏铁路等线性工程基础设施的维护和安全带来了较大的困扰。地表形变作为路基病害及环境地质灾害的第一表征，可以对工程病害进行有效的指示，但到目前为止，尚未有覆盖整个工程走廊多年冻土区的相关地表形变数据集，特别是垂直向的形变数据。
", "ds_source": "本研究首先基于LiCSBAS工具包对LiCSAR产品进行时序InSAR处理，以获得工程走廊多年冻土区地表升、降轨一维LOS向形变；然后以SAR影像获取日期为条件，筛选出影像获取日期相同或相近的升、降轨时序InSAR形变监测数据，在忽略南北向形变的情况下解算出地表东西向和垂直向形变，从而获得2017–2022年观测期内的地表一维（升、降轨LOS向）和二维（东西向和垂直向）形变速率和时序累积形变结果（共计51期），即青藏工程走廊多年冻土区地表形变数据集。
", "ds_process_way": "基于现场监测的形变结果与垂直向形变结果的对比表明，精度大多在10 mm内，最大不超过30 mm。本数据不仅可以作为后续相关InSAR形变监测的对比数据，而且还可以为交通线性工程，如青藏公路、青藏铁路等的正常运营和维护提供数据支撑和有效建议。此外，本数据集还可以作为输入数据用于多年冻土活动层厚度的反演等工作。
", "ds_quality": "数据质量良好。
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