How to select bands in s2resampling processor to cater for C2RCC processor in SNAP 11?

Optical Toolbox
1

I have noticed that s2resampling processor in SNAP 11 provides more flexbility for selecting bands needed for resampling,the previous version of s2resampling processor took too much time for resampling a great many auxillary bands and masks which also took too much disk space. My question is how to select the necessary bands needed in C2RCC processor, the ‘resample only bans’ listbox on s2 Resampling UI might be better to give an checkbox for ‘selecting necessary bands fo C2RCC’.

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The S2-C2RCC requires the following bands and tie-points: "B1", "B2", "B3", "B4", "B5", "B6", "B7", "B8", "B8A", "B9", "B10", "B11", "B12", "sun_zenith", "sun_azimuth", "view_zenith_mean", "view_azimuth_mean", "msl", "tco3", "tcwv"

If you only want to use C2RCC after the resampling, you can also do the generic resampling. It is faster. C2RCC does not benefit from the special s2-resampling.
You can select the bands which are resampled by adding a subset operation to the chain.
Subset to the needed bands and tie-points → resample the data → run C2RCC.

Your idea about offering an option in the resampling GUI is nice. And relatively easy doable. The resampling operator could provide an extension-point for configurations. The C2RCC and other operators provide these configurations.

3

Very instructive and timely guidance from Mr.Marco Peters, great thanks!

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“msl”, “tco3”, “tcwv” can’t be set in the parameters fro GPF,I got an error:
parameters = HashMap()
GPF.getDefaultInstance().getOperatorSpiRegistry().loadOperatorSpis()
parameters.put(‘targetResolution’, ‘10’)
parameters.put(‘polyDegree’, ‘2’)
parameters.put(‘continueOnFail’, ‘false’)
parameters.put(‘bands’, ‘B1,B2,B3,B4,B5,B6,B7,B8,B8A,B9,B10,B11,B12,view_zenith_mean,view_azimuth_mean,sun_zenith,sun_azimuth,msl,tco3,tcwv’)

RuntimeError Traceback (most recent call last)
Cell In[1], line 100
98 parameters.put(‘bands’, ‘B1,B2,B3,B4,B5,B6,B7,B8,B8A,B9,B10,B11,B12,view_zenith_mean,view_azimuth_mean,sun_zenith,sun_azimuth,msl,tco3,tcwv’)
99 parameters.put(‘tie-points’, ‘msl,tco3,tcwv’)
→ 100 s2_resample_file = GPF.createProduct(‘S2Resampling’, parameters, product)
101 ProductIO.writeProduct(s2_resample_file,“f:/snappy s2/”+s2_L1C_zip_file +“-10m”, ‘BEAM-DIMAP’)
102 s2_10m_product = ProductIO.readProduct(“f:/snappy s2/”+s2_L1C_zip_file +“-10m.dim”)

RuntimeError: org.esa.snap.core.gpf.OperatorException: Operator ‘S2ResamplingOp’: Value for ‘Resample only bands’ is invalid: ‘msl’

Shall I set another parameter like this?
parameters.put(‘tie-points’, ‘msl,tco3,tcwv’)

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The S2Resampling does not support to define the tie-point grids. I think the tie-points are copied by default.
Only set
parameters.put(‘bands’, B1,B2,B3,B4,B5,B6,B7,B8,B8A,B9,B10,B11,B12,view_zenith_mean,view_azimuth_mean,sun_zenith,sun_azimuth’)