SpectralProcessing usecases

[Andreas Janz]

As discussed with BJ, SL, AJ and FT, we want to implement 3 different usecases for spectral processing:

1. The aggregation of spectral profiles, stratified by a categorical field.
2. Spectral normalization by white reference, a) by one reference per spectra, and b) by one reference for all spectra.
3. Spectral resampling.

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[Andreas Janz]

@Benjamin Jakimow now that we have ConvexHull and ContinuumRemoval, you may want to use it for your usecases: #926

[Andreas Janz]

@Benjamin Jakimow you may paste intermediate results in form of a screenshot here?

[Andreas Janz]

What about the aggregation usecase? Do we need a dicussion about that in the team or do you have a first implementation already? For me it is not clear how that will work in the GUI.

[Andreas Janz]

Here is the algo for usecase 1:

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[Benjamin Jakimow]

update qps, addresses #854

→ <<cset ec881731da09>>

[Benjamin Jakimow]

case 2+3 are implemented opened #1130 for case 1, since this requires changes in QGIS API