The Factor analysis operation results in a linear transformation of a set of (satellite) raster maps. The map values are transformed into raster map values, called factors.
The following steps apply:
Looking at two input raster maps the factor analysis coefficients matrix looks like:
where:
a1 and a2 |
= |
coefficients of the first factor (factor loadings) |
|
b1 and b2 |
= |
coefficients of the second factor (factor loadings) |
If M bands are used, an MxM matrix of factor analysis coefficients is computed.
The expression in the map list reads:
MapListMatrixMultiply(InputMapList, FactorAnalysisMatrix, nr of output maps)
where:
x and y |
= |
spectral values in the first and second factor (output maps) |
|
X and Y |
= |
spectral values in the two input raster maps |
|
a1 and a2 |
= |
coefficients of the first factor |
|
b1 and b2 |
= |
coefficients of the second factor. |
References:
See also: