Measurement of Surface Displacement and Deformation of Mass Movements Using Least Squares Matching of Repeat High Resolution Satellite and Aerial ImagesReport as inadecuate




Measurement of Surface Displacement and Deformation of Mass Movements Using Least Squares Matching of Repeat High Resolution Satellite and Aerial Images - Download this document for free, or read online. Document in PDF available to download.

Department of Geosciences, University of Oslo, P.O. Box 1047, N-0316 Oslo, Norway





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Abstract Displacement and deformation are fundamental measures of Earth surface mass movements such as glacier flow, rockglacier creep and rockslides. Ground-based methods of monitoring such mass movements can be costly, time consuming and limited in spatial and temporal coverage. Remote sensing techniques, here matching of repeat optical images, are increasingly used to obtain displacement and deformation fields. Strain rates are usually computed in a post-processing step based on the gradients of the measured velocity field. This study explores the potential of automatically and directly computing velocity, rotation and strain rates on Earth surface mass movements simultaneously from the matching positions and the parameters of the geometric transformation models using the least squares matching LSM approach. The procedures are exemplified using bi-temporal high resolution satellite and aerial images of glacier flow, rockglacier creep and land sliding. The results show that LSM matches the images and computes longitudinal strain rates, transverse strain rates and shear strain rates reliably with mean absolute deviations in the order of 10−4 one level of significance below the measured values as evaluated on stable grounds. The LSM also improves the accuracy of displacement estimation of the pixel-precision normalized cross-correlation by over 90% under ideal simulated circumstances and by about 25% for real multi-temporal images of mass movements. View Full-Text

Keywords: image matching; least-squares; mass movement; displacement; velocity; deformation; strain rate image matching; least-squares; mass movement; displacement; velocity; deformation; strain rate





Author: Misganu Debella-Gilo * and Andreas Kääb

Source: http://mdpi.com/



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