Feature based Image Matching for Antarctic Ice Flow Measurement using DISP Images in 1960s

来源 :2015中国极地科学学术年会 | 被引量 : 0次 | 上传用户:yangyang03
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  Current ice flow products from remote sensing techniques are mostly produced by satellite SAR and optical images which date back to 1970s by Landsat images.Historical images such as aerial photographs or the first generation satellite images like declassified intelligence satellite photographs(DISP)images provide a valuable view of the Antarctic ice-sheet's configuration in 1960s,extending the coverage of Antarctic ice flow observations.This research presents a framework and the initial result of our efforts in surface ice flow measurement in Antarctic ice sheet by using the DISP images in 1963.The framework mainly consists of two parts,geometric modelling of the DISP images,and feature based image matching strategy to derive the surface ice velocity.In the geometric modelling part,the camera calibration parameters including focal length and lens distortions were collected from the camera calibration reports.The tie points and control points were selected by considering topography,shadowing and with help of existing image mosaics and DEMs.The initial estimates of the exterior parameters were derived from the orbital ephemeris of specific missions,and they were then refined in a bundle adjustment process.The accuracy of the bundle adjustment was assessed and discussed.In the image matching part,a feature based hierarchical matching technique was proposed and implemented.After preprocessing,extracted feature points were matched hierarchically in each pyramid layer under different geometric constraints.A special process was devoted to handle the point displacement caused by the ice flow.The results show the reconstructed terrain and ice flow speed in 1963 in the experimental area.
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