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Change Detection from High Resolution Satellite Imagery


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Fu, Xiao Ming 2007 , 'Change Detection from High Resolution Satellite Imagery', Unspecified thesis, University of Tasmania.

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This study analyses whether change detection techniques can identify vegetation
changes in Macquarie Island, using high resolution Quickbird satellite imagery; it
also takes fuzzy aspects of changes into account in order to explore and discover the
uncertainty in the change detection outputs. As Macquarie Island has been severely
affected by rabbit grazing, this study probes into the vegetation changes on it by
different change detection techniques, with a view to help people make proper
management strategies to protect Macquarie Island's unique environment. Besides,
because of its geographically isolated location, monitoring changes on the Island is
most efficiently achieved using satellite imagery.
Traditional change detection techniques can distinguish change from no change in a
binary way; incorporating fuzziness is a new approach for change detection as it
extends the binary results to the fuzzy results by revealing the transitional nature of
the natural environment in the most real way, thus a more understandable
interpretation of the change results can be available. Therefore, fuzzy change
detection techniques have been investigated in this study.
Two Quickbrid images were used as the input in this study; one was acquired in
March 2005 and another was acquired in March 2007. In this study, six change
detection techniques( with three in each group) have been implemented, namely,
normalized difference vegetation index (NDVI), change vector analysis (CVA); postclassification
change detection, as one group; and fuzzy normalized difference
vegetation index (fuzzy NDVI), fuzzy change vector analysis (fuzzy CVA), fuzzy
post-classification change detection, as the other. For the fuzzy group, fuzzy NDVI
and fuzzy CVA were generated by fuzzy membership functions, and fuzzy postclassification
change detection was generated by comparing with fuzzy classification
results. The support vector machine (SVM) was used as the classifier.
The study reported that fuzzy change detection not only can identify the changes in
the Macquarie Island, but can better reveal the gradual process of change in a
specific time period. Nevertheless, it does not improve the accuracy, compared with
the traditional methods, mainly because that the results of fuzzy change detection are
based on that of the binary change detection.

Item Type: Thesis - Unspecified
Authors/Creators:Fu, Xiao Ming
Copyright Holders: The Author
Copyright Information:

Copyright 2007 the Author - The University is continuing to endeavour to trace the copyright
owner(s) and in the meantime this item has been reproduced here in good faith. We
would be pleased to hear from the copyright owner(s).

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Includes bibliography

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