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標題: A genetic algorithm (GA) based automated classifier for remote sensing imagery
作者: Yang, M.D.
關鍵字: sensed data;segmentation;landslide;clusters;validity
Project: Canadian Journal of Remote Sensing
期刊/報告no:: Canadian Journal of Remote Sensing, Volume 33, Issue 3, Page(s) 203-213.
Conventional unsupervised classification divides all pixels within an image into corresponding classes based on the distance between pixels and the cluster centres. The number of classes must be selected a priori but is seldom ascertainable with little information. To analyze a large dataset, such as a remote sensing dataset, requires an automatic unsupervised classifier which needs no human effort during the process of image clustering. A genetic algorithm (GA) is adopted to search the cluster centres and choose a suitable cluster number for digital images to overcome the disadvantages of the conventional unsupervised classifier. The GA-based automated classifier was executed on several test images for validity and SPOT satellite imagery for practical application. The satellite images classified by the GA-based classifier and iterative self-organizing data analysis technique (ISODATA) were compared with a classified result through a supervised classification. According to the estimation of classification accuracy by error matrices and kappa statistic, the GA-based classifier performed better than the unsupervised ISODATA and as good as a supervised classifier, even without manipulation by an analyst. A modified GA-based classifier using maximum likelihood (represented by the z score) as a clustering criterion was also proposed and proven to be capable of performing automatically as well as a supervised classifier.
ISSN: 0703-8992
Appears in Collections:土木工程學系所

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