Principal components
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| − | {{Content Tree|HEADER=QGIS Tutorial|NAME=QGIS tutorial}}
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| − | When [[principal components analysis (PCA)]] is used for change detection, the input bands are acquired at different dates. The first principal component refers to invariant information while second principal component shows the magnitude of change of dynamic components. To simplify the interpretation only three bands (Band 3 (red), 4 (NIR) and 5 (SWIR) ) of two different dates (1992 and 2005) are used.
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| − | {{exercise|message=Exercise 55|text=}}
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| − | ==Related articles==
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| − | * [[Multitemporal color composites]]
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| − | * [[Image Algebra change detection]]
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| − | [[category: Change detection]]
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Latest revision as of 10:47, 17 September 2014
