期刊名称：Archiwum Fotogrametrii, Kartografii i Teledetekcji
印刷版ISSN：2083-2214
出版年度：2006
卷号：16
语种：English
出版社：Main Board of Association of Polish Surveyors
摘要：ASTER images applicability to surface crevassing assessment of tidewater glacier in southern Spitsbergen,Svalbard was investigated. In the first phase of research,the glaciers spatial extent determination methods were investigated - spectral bands rationing and Normalized Difference Snow Index (NDSI). A new method based on saturation image obtained by intensity-hue-saturation transformation of 345 colour composite was tested as well. Image texture parameters were applied to separate ice floats from glaciers. The supervised classification of original spectral bands for crevassed areas identification failed. Better results were achieved using chosen texture images,but still too many other glacier areas (e.g. dark moraines or streams on glacier surface) were classified as crevasses. In the last stage of research,object-oriented image analysis software (eCognition) was used. The parameters for ASTER image segmentation,resulting in determination of crevassed glacier areas as separate image segments,were searched. To achieve such a goal,image segmentation performed using ASTER spectral bands required different scale,shape and compactness factors for individual glaciers. This is because glacier dynamics and morphology differ,causing differences in shapes and extent of crevassed areas. Satisfactory results were achieved after the application of a two-level segmentation procedure: ASTER spectral band 1 segmentation using large scale parameter and than MaZda software computed texture image segmentation with a small-scale factor. The research confirmed the applicability of satellite ASTER images for monitoring the Svalbard glaciers. The spatial extent of the glaciers was determined by simple thresholding of transformed spectral bands and texture images. Furthermore,obtained segmentation results should enable successful application of object oriented image classification in eCognition to mapping of crevassed glacier areas. Such a classification is planned as the next stage of the research.
其他摘要：Celem prezentowanej pracy była ocena moŜliwości wykorzystania obrazów satelitarnych ASTER do określenia stopnia uszczelinienia powierzchni lodowców Svalbardu. Pierwszy etap badań polegał na określeniu granic lodowców. Przetestowano metody stosowane w tym
