Error NullPointerException when using GPT

s1tbx
#1

Hi,

I am encountering errors when executing graphs to process Sentinel-1 imagery using the GPT after the last SNAP update. I get a NullPointerException for different graphs I tested, including some that have worked before.

The messaging looks as follows:
SEVERE: org.esa.snap.core.gpf.internal.OperatorSpiRegistryImpl: org.esa.snap.productlibrary.gpf.FindImagePairOp$Spi:Find-Image-Pair conflicts with org.esa.s1tbx.fex.gpf.FindImagePairOp$Spi:Find-Image-Pair
INFO: org.esa.snap.core.gpf.operators.tooladapter.ToolAdapterIO: Initializing external tool adapters
INFO: org.esa.snap.core.util.EngineVersionCheckActivator: Please check regularly for new updates for the best SNAP experience.
Executing processing graph
INFO: org.hsqldb.persist.Logger: dataFileCache open start
java.lang.NullPointerException
done.

Error: [NodeId: SliceAssembly] java.lang.NullPointerException[S1-preprocessing-single-beforeSA.xml|attachment]

Attached are two graphs I am trying to execute.

Thanks in advance!

(upload://tn4lyih9z2pWM4KKZEKWQgDJJ2R.xml) (1.7 KB) S1-preprocessing-single-SA.xml (1.4 KB)

#2

I’ve found that order matters, try rearranging your nodes so that they are in order.

#3

The graph should be in the following sequences of operators, to apply SliceAssembly

image
image.jpg1206×364 63.3 KB

#4

Thanks for the suggestion. I tried that but unfortunately the error keeps occurring.

#5

I am working with GRD products so I don’t think I need to apply TOPSAR-Split. I have two GRD scenes that I would like to stitch since my ROI is on the boundary between 2 slices.

#6

Your first post referred to TOPSAR-Slice assembly and this was the inappropriate graph you shared,
image

Thus, I gave you the right graph of implementing this process, in this post, Source of the post

In this case, you could,

Apply orbit for each tile, ---->then Apply from Radar tab, SAR Mosaic,