BEAM-Dimap format is good solution.
My points are:
When to use complex calibration
No able to perform terrain correction. output is zero data (blank image). When terrain correction is not performed then I am getting the Entropy, alpha bands.
SNAP supports calibration after multi-looking (unless you check “output intensity”) so you can make a subset first and multi-look to reduce the data size to be processed.
Hey thanks for the info. It recalled helped a lot. I tried the graph and it is working fine But can you help me explaining the difference between:
Product -> Deburst -> Output
and
Product -> split(IW1/IW2/IW3) -> Deburst -> Merge -> Output
i.e. splitting and debursting individual sub swath and then merge to combine them vs Just debursting the product. The output of both these are different.
to compare how similar both rasters are you can use the scatter plot tool
you can define a minimum and maximum by yourself in the color manipulation tab and apply it to both images. You can also apply the color of the first result to the second with this button (select ‘no’ when asked to search for min/max)
Both should acutually produce the same result. I guess the colors are just distributed differently because of different value ranges of both products.
Hi, I’ve been seeing the same problem when processing decomposition step. In fact it cost 36 hours to process a whole graph(containing preprocessing and decomposition). Can I ask how much faster it get when you divide the graph into two parts? Thanks a lot!
this depends on your system’s capabilities. But often large graphs are unnecessarily slow. So if you only have to apply this processing once I recommend avoiding graphs in general. They only make sense if you want to apply some workflow on multiple images.
Thanks! By the way in other blogs someone said when applying “Polarimetric Matrices” after “Multi-looking”, you’ll get the wrong answer. I notice that you didnt do the “Polarimetric Matrices” step? and directly apllied decomposition?
SNAP allows to perform polarimetric decomposition directly on the Intensities without converting to S/T/C matrix before. As many of them include a spatial window I would not multi-look before unless you want to change the pixel resolution for a certain reason.