Principal components
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| − | When [[principal components analysis (PCA)]] is used for change detection, the | + | 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. |
{{exercise|message=Exercise 55|text=}} | {{exercise|message=Exercise 55|text=}} | ||
Revision as of 16:58, 25 January 2011
QGIS Tutorial
Category QGIS tutorial not found
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.
