Comparative Evaluation of Satellite Remote Sensing Techniques for Land Cover Change Detection
Date Issued
2004
Date
2004
Author(s)
Chao, Chun-Chen
DOI
zh-TW
Abstract
With the rapid progress of remote sensing techniques and related sciences, it’s easier to acquire different kinds of digital images like satellite images and air photos, which is widely used for scientific researches. For land cover change detection, remote sensing image could provide data for a vast area instantaneously and thus resulted in reduced time and effort cost than conventional ways of investigation like field survey and image interpretation of air photos. Remote sensing is also an alternative to get the full view of a disaster over extensive areas in a short time avoiding the limitation of weather and landforms.
For multi-spectral images change detection, there are numerous techniques with different properties and effectiveness. To assess the difference between those techniques, the Yangmingshan National Park was chosen as the research area. The SPOT (Le System Pour l’Observation de la Terre) satellite images of the research area are carefully georeferenced with ordinary Kriging method. Change percentage from which the correspondent change threshold of each method could be derived was determined by the difference of peak-adjusted NDVI histogram of the images of two dates. The places where changes occurred were found by each change detecting technique and then compared with the air photos available in the same area around the same time period. Then the effectiveness of applied techniques could be compared. Furthermore, inevitable radiometric difference exists between images of different time period because of the necessary difference of atmosphere conditions, and results of the change detection would be affected by the radiometric difference. We could reduce the radiometric difference and increase the accuracy of the change detection by a procedure known as relative radiometric normalization. In this study, different radiometric normalization techniques were applied to make the adjustment before the change detection, and the effectiveness of the different normalization techniques could be compared based on the results of subsequent change detection.
Subjects
輻射校正
衛星遙測
一般克利金法
灰階尖峰對齊
變遷偵測
多光譜影像
ordinary Kriging
radiometric normalization
change detection
remote sensing
multi-spectral image
Type
thesis
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