When I type in the equation [(S2-S1)/(M-S1)], it says there are no errors, however once I try to run it, I receive the error message attached. I tried to ‘reproject’ the NDVI images, and I still got the same error.
I opened up the three NDVI images I wanted to use on SNAP. Then I clicked Raster>GeometricOperations>Collocation. I selected one NDVI as my ‘master function’ and the other two as ‘slave functions’. The collocate image was produced. I then right clicked to Band Maths, and then selected Edit Expression. I typed in my equation, to which it said no errors, and tried to run it. It keeps giving me the error message I attached.
I tried to make the collocate from the BEAMP DIMAP format, and I then got this error message. The image that has the error is an L1C, whereas the other two are L2A-- the Sen2Cor Processor to reformat the L1C image to L2A also isn’t working so I’m using the L1C images as is. Could this be why it isn’t working-- because they’re different image formats?
right click on each collocted band and select Properties
Your second message confuses me. Subset, another subset, reproject… Seems to be a different pre-processing and a different error. I am now trying to reproduce your first problen with the “Undefined symbol…” error first.
Download two S2 products (same tile) and extract them
Apply S2 Resampling to bring the product into a common resolution
Create a subset for each (same area)*
Perfom the NDVI operator
Collocate both NDVI products (get the same error, I don’t understand it)
Alternative: Use Create Stack (Radar Coregistration > Stack Tools), select Product Geolocation instead of Orbit in the second tab
*whenever you create a subset you have to make sure that it is correctly written and that all bands are correctly transferred into the subsequent product. Sometimes, SNAP “loses” some of the bands during S2 subsetting.
Excuse me. My question is if I was made the process ‘collocation’ normally, however when I opened the S2, I have made without extract them files, and… that’s has worked. Is there any problem for the final product if I’ve jumped this step for example?