Application of integrated remote sensing and GIS technologies to geological, agricultural, water and environmental issues in far west Texas

Hongjie Xie, University of Texas at El Paso

Abstract

This study focuses on applying integrated remote sensing and GIS technologies to geological, agricultural, water and environmental studies in the far west Texas area. The primary technical topics that have been investigated and employed include radar image processing, speckle removal, destriping, data fusion, seamless image mosaicking technology, mask and ROI techniques, DEM processing and 3D visualization, image classification techniques, gravity and magnetic data processing, algorithm implementation for automatic image registration, ArcView/ArcInfo GIS techniques, and GIS database building. ^ JPL/NASA's AIRSAR/TOPSAR is a multipolarimetric, multiwavelength, and interferometric airborne synthetic aperture radar capable of imaging in C-, L-, and P-bands (5.7, 24.5, and 68 cm). The study mainly focuses on its preprocessing, despeckling, and destriping. Among statistical adaptive speckle removal algorithms, G-MAP (Gamma Maximum A Posteriori) had the best performance. For banding removal, we derived a new method that we call combined principal components analysis (CPCA) that was very effective with our data. Signature differences were studied and compared at different radar wavelengths and between radar and optical (ETM+) images. Some subsurface objects (like water pipelines) were clearly visible in the radar images, especially for the P-band. Data fusion based on the color transform technique was employed to integrate Landsat 7 (30 m ETM+ data fused with the accompanying 15 m panchromatic data) and TOPSAR data after speckle and banding removal. The resulting fused image brought out new features that were not evident in the original images and helped identify many features whose origin was not clear in the original images. ^ AIRSAR/TOPSAR and TM/ETM+ images have been successfully used for mapping the East Franklin Mountains fault scarp and related small faults within the Hueco bolson as well as the Mayfield fault scarp. Remote sensing analysis of nuclear waste disposal site can be a very effective early analytical tool to determine the presence of potential fatal flaws. If the fatal flaws, based on remote sensing technology, were carefully considered before making a siting decision, a great deal of time, money, and labor could be saved. Remote sensing technology also would provide base line documentation for the determination of physical and financial remediation responsibility. (Abstract shortened by UMI.) ^

Subject Area

Geophysics|Agriculture, General|Environmental Sciences|Remote Sensing

Recommended Citation

Xie, Hongjie, "Application of integrated remote sensing and GIS technologies to geological, agricultural, water and environmental issues in far west Texas" (2002). ETD Collection for University of Texas, El Paso. AAI3080481.
http://digitalcommons.utep.edu/dissertations/AAI3080481

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