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Fig. 1 | Open Geospatial Data, Software and Standards

Fig. 1

From: Remote sensing of burned areas via PCA, Part 1; centering, scaling and EVD vs SVD

Fig. 1

Conventional mean-centered EVD-based PCA on the covariance matrix of a bi-variate data set composed by a post- and a pre-fire MODIS surface reflectance band 2. Black dots and grey asterisks are respectively samples of burned surfaces and vegetation. The original coordinate system (light greyed) has been shifted after centering. The point-scatter has been rotated after PCA to the direction in which the spread of the data onto the new axes (dashed axes, PC1 and PC2) is maximised. These are restricted to be orthogonal

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