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中文摘要：
InSAR具有全天时、全天候对地观测等特点，现已成为空间对地观测技术的研究热点，如何从解缠后的相位通过高程估算来重建DEM的问题也变得也越来越重要了，本文着重介绍了三种高程计算的方法，并通过实际数据对它们进行比较分析，解决了高程估算方法的选择问题。
英文摘要：
InSAR has already became hot topic of techniques that observe the ground from space ,because of its day-and night and all-weather imaging capability. It becomes more important that how to construct the DEM from unwrapcd phases through elevation estimation . In this paper we will introduce three elevation computation methods emphatically, and compare and ana- lyze them by processing real data and solved the problem, how to choice elevation estimation methods.
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3-D multi-step travel time tomography: Imaging the local, deep velocity structure of Rabaul volcano,
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