Principal components
From AWF-Wiki
QGIS Tutorial
Category QGIS tutorial not found
When principal components analysis (PCA) is used for change detection, the inputbands are acquired at different dates. The first principal component refers to invariantinformation while second principal component shows the magnitude of change of dynamiccomponents. To simplify the interpretation only three bands (Band 3 (red), 4 (NIR)and 5 (SWIR) ) of two different dates (1992 and 2005) are used.
