Dear members of step forum.
I have imported an *hdr atmospheric corrected image. Afterwards I converted to BEAM-DIMAP format.
I would like to create Biophysical parameters: LAI, FAPAR, etc but I get an error message
“Missing band at 560.0 nm”.
please see the attached
The tool needs the wavelengths of each band stored in the metadata. I wonder why they are lost in your product. Please enter 560 under “Spectral Wavelength”, save the product, and try again.
Unfortunately I had no luck.
I’ll try another approach. I want to mosaic - clip and finally create Biophysical parameters with S2 Level 2 data. I’ll use SNAP.
As I see there is the Multi-size Mosaic.
I’ll try to create a graph builder with this option even if I’m not sure that it works correctly
with S2 level 2 data ( I have read the relative post) .
I can’t see the menu of Multi-size mosaic into Graph-builder in order to change the parameters. Is that right?
Please see the attached file.
Why do you use the graph builder for this step?
Even if you have multiple image products it makes sense test the operations in the gui first before you automate the processing with a graph.
my goal is to create 10-days composite S2 Level 2 product and produce Biophysical parameters (LAI-FAPAR etc) and NDVI NDWI. I would like somehow to automate the process as much as possible.
Ι’m searching the AOI monitoring and Product Library options for downloading S2 data and afterwards,
I’ll follow your advice, to use from SNAP gui the Multisize Mosaic option.
Thanks again for your help.
Maybe it’s to much for me now to work with gpt.
I 'm thinking to apply another approach. With graph builder, firstly to resample - subset - NDVI… and
secondly to create a mosaic at the final products. Unfortunately the graph builder gives an error about the NDVI band maths
Please see the attached file. I don’t understand with graph builder doesn’t work with S-2 data
I reinstall the SNAP and the related plugins.
When I create for the first time the model in graph-builder everything it’s okay. I can run
the procedure. But when I retry to run the model then I get an error message about “Undefined symbol B8”
and at “Edit expression” the “Data-Source” have disappeared.
Please see the attached file. I’m struggling to figure out what I’m doing wrong.
Now I’m facing an other issue.
I use Batch processing in order to create the output products (LAI, FAPAR, NDVI, etc) from the two adjacent images. But the model gives me the results of the one image twice (maybe something is wrong at the subset ??) . As I understand with the batch processing I can apply the graph in more than one images.
As I told you my goal is to mosaic the final product in on image containing Biophysical parameters and NDVI.
Please see the attached file
I ran the modified graph model but I also get the same product two times.
Maybe something is wrong in the “subset” or “write” (output)?
Please see the attached file
please check in the metadata if it is the same product or maybe another product but with the same name. I had this once because the Batch Processing somehow mixed the output names.
As I understand it is one product imported twice in the SNAP. The graph saved only the product from the first image.
Please see the attached file. At the left side is depicted the same product imported twice, after the graph processing and at the right side is the batch processing with the two images imported.
Yes I would like repeatedly running the graph in 3 different places.
The “BiophysicalOP" is the default name that automatically is given by SNAP.
I deleted the name but when I run the graph it appears by default. I run the graph but the same issue.
I’ll try to recreate the graph by the scratch and I’ll let you know
Thanks!