Help! Sen2coral module


#1

Hello,
Could you help me calculating bathymetry from sentinel 2 L1C image by sen2coral module? Sorry for my bad English


#2

Hi,
sen2coral has not yet been released. If you want to use it, you can do it but you have to build it from the sources and install it in SNAP. You can find it here: https://github.com/senbox-org/sen2coral-box

For calculating bathymetry there are two different operators (both require as input an atmospheric corrected image, for example a sentinel 2 L2A product):

  • Empirical bathymetry: Estimation of bathymetry by empirical regression method, you need some in-situ bathymetric data.
  • Model inversion - SWAM: it computes the mapping habitats and depth by inversion of bio-optical models. It is based on a modified version of SAMBUCA (Semi-Analytical Model for Bathymetry, Un-mixing and Concentration Assessment, M.Wettle & V. Brando, CSIRO Land and Water, 2006 - http://www.clw.csiro.au/publications/science/2006/sr22-06.pdf )

You can find more info about them in the help pages when you install the plugin in SNAP.


#3

Thanks for helping!
I installed Sen2coral and read information in the help page. I don’t know how to finding parameter for Model inversion - SWAM. So I can’t try it. I don’t know Empirical bathymetry or Model inversion - SWAM is better. Could you help me!


#4

They are different approaches, depending on the data you have and the quality of the input images the results could be better with the empirical or with the inversion model.

On the other hand, there are some examples of xml parameter files for SWAM in your .snap folder in:

…/.snap/auxdata/sen2coral/xmlFiles

and you can find information about their format in the help pages in SNAP.


#5

Thank you very much!


#6

@ cookie,

Could you please advise on how to use (call) Sen2coral. I’ve managed to install it following:

(https://github.com/senbox-org/sen2coral-box)

but not sure how to proceed to apply it on an image. I’m interested in testing it for deriving benthic maps (corals, algae, sand, …).

I will appreciate your response!


#7

Hi @chrisi,

have you looked at SNAP help? Help-> Help contents -> Optical -> Thematic Water Processing-> Sen2Coral?
There you will find the description of the sen2coral operators and how to use them.


#8

Hi @chrisi,
You interested in testing it for deriving benthic maps so you had to install SWAM. If you installed Sen2coral, you have to do some step to install SWAM. I don’t have basic knowledge about Anacoda, Python,… So I can’t install SWAM of Sen2coral and I can’t use it. Sorry for not helping!