Abstract Up-to-date digital elevation model (DEM) products are essential in many fields such as hazards mitigation and urban management. Airborne and low-earth-orbit (LEO) space-borne interferometric synthetic aperture radar (InSAR) has been proven to be a valuable tool for DEM generation. However, given the limitations of cost and satellite repeat cycles, it is difficult to generate or update DEMs very frequently (e.g., on a daily basis) for a very large area (e.g., continental scale or greater). Geosynchronous synthetic aperture radar (GEOSAR) satellites fly in geostationary earth orbits, allowing them to observe the same ground area with a very short revisit time (daily or shorter). This offers great potential for the daily DEM generation that is desirable yet thus far impossible with space-borne sensors. In this work, we systematically analyze the quality of daily GEOSAR DEM. The results indicate that the accuracy of a daily GEOSAR DEM is generally much lower than what can be achieved with typical LEO synthetic aperture radar (SAR) sensors; therefore, it is important to develop techniques to mitigate the effects of errors in GEOSAR DEM generation.

中文翻译：

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地球同步 InSAR 每日 DEM 生成质量分析

摘要 最新的数字高程模型（DEM）产品在减灾和城市管理等许多领域都是必不可少的。机载和近地轨道 (LEO) 星载干涉合成孔径雷达 (InSAR) 已被证明是生成 DEM 的宝贵工具。然而，考虑到成本和卫星重复周期的限制，很难非常频繁地（例如每天）生成或更新非常大的区域（例如，大陆规模或更大）的 DEM。地球同步合成孔径雷达 (GEOSAR) 卫星在地球静止轨道上飞行，使它们能够以非常短的重访时间（每天或更短的时间）观察同一地面区域。这为日常 DEM 生成提供了巨大的潜力，这对于星载传感器来说是可取的，但迄今为止是不可能的。在这项工作中，我们系统地分析了每日 GEOSAR DEM 的质量。结果表明，每日 GEOSAR DEM 的精度通常远低于典型 LEO 合成孔径雷达 (SAR) 传感器所能达到的精度；因此，重要的是开发技术来减轻 GEOSAR DEM 生成中错误的影响。