C和L波段SAR数据在填海新区的应用及特性分析

收集了35景C波段ENVISAR ASAR和20景L波段ALOS PALSAR数据，采用时间序列合成孔径雷达干涉测量（interferometric synthetic aperture radar，InSAR）分析技术获取了典型的填海新区-上海临港新区2007年~2010年间的沉降速率场。从空间、时间密度以及监测精度方面，对C和L波段的数据的形变估计结果进行对比，并进而讨论C波段和L波段数据在填海新区地表形变探测差异的原因以及数据在填海新区监测的特性。

Analysis of Capabilities of C-and L-band SAR Data to Detect Newly-reclaimed Area

Time series interferometric synthetic aperture radar (InSAR) technology is employed to process two stacks of C-band ENVISAT ASAR and L-band ALOS PALSAR data to retrieve the settlement velocity field from 2007 to 2010 in the Lingang area located in southeast Shanghai. About forty-five percent of the total land in the Lingang area was created by reclamation projects. Land subsidence has become a significant issue as un-compacted filling materials cover unconsolidated marine sediments. Our study revealed that significant subsidence caused by hydraulic fill consolidation exists within Lingang; the settlement velocity can be as high as -30 mm/a, which implies the necessity for long-term continuous monitoring. The results from C-and L-band data were analyzed and compared in terms of precision regarding leveling data, the density of coherence points and time dimension. The L-band results show some advantages in the developing area while C-band results provide relative precise measurements.