| Synthetic Aperture Radar Interferometry (InSAR) technology, which uses radar signal phase information to obtain three-dimensional deformation on the Earth's surface, has been widely studied and discussed in recent years as a new monitoring tool. Besides, it has the features of low-cost, continuity, and strong remote sensing capabilities and so on. Currently, it has been widely applied in a variety of geological disasters such as earthquakes, volcanoes, and ground subsidence. However, the InSAR techniques is lagging behind in the data post-processing, result expression and analysis, which make it difficult to meet the needs of the practical application and even become the bottleneck of InSAR results in correct analysis and applications.Geographic Information System (GIS), which has a strong application in the data collection, storage, analysis, management, display and simulation can provide good service for the management and decision-making. By applying the powerful editing, processing and analysis functions of GIS, this thesis aims to study the problems exsisting in InSAR data post-processing, which includes the following aspects:1. In this paper the author tries to analyze the InSAR data post-processing and its analysis procedure based on GIS and lists the complete process. And finally comes up with quadtree compress, Kriging interpolation and low-pass filtering method to deal with the deformation data drawed by InSAR technique, thus to restrain the deformation gross error effectively and benefits the extraction of characteristic points and the drawing of the contour map.2. This paper adopts the geostatistics analysis thought to analyze and study the deformation data drawed by the InSAR technique. By establishing a appropriate mathematical model, the author researches into the interpretation simulation of the deformation drawing and attains the goal of filling the vacancy owing to the loss of coherence, eliminating the variance, and getting a better InSAR deformation drawing. The research also bears fruit based on the data in 1992,1996 and 2005 in Xi'an.3. Based on the tipical feature of settlement and deformation in the ground subsidence of Xi'an, the thesis firstly collects and analyzes the land subsidence information in different periods in Xi'an, and secondly establish Kriging interpolation model in space domain and multi-spline model in time domain respectively. Based on these we inverse and fit the deformation variables of time series from 1960 to 2009 in Xi'an, and construct the deformation map of accumulating ground subsidence in forty-nine years in Xi'an.4. The thesis sets up an InSAR data post-processing and analyzing system based upon GIS. The main objective of this system is to implement the integrated application and analysis of multi-source data in InSAR post-processing,which means that the deformation data acquired by InSAR monitor, swifts from RS environmental pattern to GIS operational environment after data conversion, and combined with the data from geography, hydrologic geology and geologic hazard, it realizes the visibility of deformation zone and also abstracts valid settlement data and then carries all kinds of statistical analysis and 3D analysis, etc. to realize and service the display and analysis of the InSAR settlement monitoring results. |
