S1 Coherence graph always worked but with SNAP 13 I get error

Microwave Toolbox
1

Hi there,

I’ve been using a custom graph to perform bi-temporal coherence of S1 images for several months and with previous SNAP versions it always worked (up until SNAP 11). After update to SNAP 13 I get an error that never occurred, see below.

Is it a bug or something?

Thanks

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
Cannot invoke "org.esa.snap.core.datamodel.Band.getUnit()" because "mstBand" is null
 done.

Error: [NodeId: CreateStack(VH)] Cannot invoke "org.esa.snap.core.datamodel.Band.getUnit()" because "mstBand" is null
org.esa.snap.core.gpf.graph.GraphException: [NodeId: CreateStack(VH)] Cannot invoke "org.esa.snap.core.datamodel.Band.getUnit()" because "mstBand" is null
        at org.esa.snap.core.gpf.graph.NodeContext.initTargetProduct(NodeContext.java:73)
        at org.esa.snap.core.gpf.graph.GraphContext.initNodeContext(GraphContext.java:213)
        at org.esa.snap.core.gpf.graph.GraphContext.initNodeContext(GraphContext.java:195)
        at org.esa.snap.core.gpf.graph.GraphContext.initOutput(GraphContext.java:179)
        at org.esa.snap.core.gpf.graph.GraphContext.init(GraphContext.java:98)
        at org.esa.snap.core.gpf.graph.GraphContext.<init>(GraphContext.java:83)
        at org.esa.snap.core.gpf.graph.GraphContext.<init>(GraphContext.java:94)
        at org.esa.snap.core.gpf.graph.GraphContext.<init>(GraphContext.java:58)
        at org.esa.snap.core.gpf.graph.GraphProcessor.executeGraph(GraphProcessor.java:127)
        at org.esa.snap.core.gpf.main.DefaultCommandLineContext.executeGraph(DefaultCommandLineContext.java:115)
        at org.esa.snap.core.gpf.main.CommandLineTool.executeGraph(CommandLineTool.java:611)
        at org.esa.snap.core.gpf.main.CommandLineTool.runGraph(CommandLineTool.java:440)
        at org.esa.snap.core.gpf.main.CommandLineTool.runGraphOrOperator(CommandLineTool.java:325)
        at org.esa.snap.core.gpf.main.CommandLineTool.run(CommandLineTool.java:226)
        at org.esa.snap.core.gpf.main.CommandLineTool.run(CommandLineTool.java:131)
        at org.esa.snap.core.gpf.main.GPT.run(GPT.java:60)
        at org.esa.snap.core.gpf.main.GPT.main(GPT.java:37)
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
        at java.base/java.lang.reflect.Method.invoke(Method.java:580)
        at org.esa.snap.runtime.Launcher.lambda$run$0(Launcher.java:55)
        at org.esa.snap.runtime.Engine.runClientCode(Engine.java:190)
        at org.esa.snap.runtime.Launcher.run(Launcher.java:51)
        at org.esa.snap.runtime.Launcher.main(Launcher.java:31)
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
        at java.base/java.lang.reflect.Method.invoke(Method.java:580)
        at com.exe4j.runtime.LauncherEngine.launch(LauncherEngine.java:84)
        at com.exe4j.runtime.WinLauncher.main(WinLauncher.java:94)
        at com.install4j.runtime.launcher.WinLauncher.main(WinLauncher.java:25)
Caused by: org.esa.snap.core.gpf.OperatorException: Cannot invoke "org.esa.snap.core.datamodel.Band.getUnit()" because "mstBand" is null
        at org.esa.snap.engine_utilities.gpf.OperatorUtils.catchOperatorException(OperatorUtils.java:434)
        at eu.esa.sar.insar.gpf.coregistration.CreateStackOp.initialize(CreateStackOp.java:345)
        at org.esa.snap.core.gpf.internal.OperatorContext.initializeOperator(OperatorContext.java:546)
        at org.esa.snap.core.gpf.internal.OperatorContext.getTargetProduct(OperatorContext.java:294)
        at org.esa.snap.core.gpf.Operator.getTargetProduct(Operator.java:359)
        at org.esa.snap.core.gpf.graph.NodeContext.initTargetProduct(NodeContext.java:71)
        ... 27 more
Caused by: java.lang.NullPointerException: Cannot invoke "org.esa.snap.core.datamodel.Band.getUnit()" because "mstBand" is null
        at eu.esa.sar.insar.gpf.coregistration.CreateStackOp.getSlaveBands(CreateStackOp.java:548)
        at eu.esa.sar.insar.gpf.coregistration.Create
2

Dear Massimo,

To help us investigate this issue, could you please share the XML graph you are using?

Thank you!

3

Dear @diana_harosa , thanks a lot for replying.

Sure please find attached the graph and here below the command to launch it from CLI using two downloaded images:

gpt D:\pcm\data\xml\s1coherence.xml -Pimage1_fpath=D:\pcm\data\s1\S1A_IW_SLC__1SDV_20250709T154050_20250709T154117_060009_07747C_BFE4.SAFE.zip -Pimage2_fpath=D:\pcm\data\s1\S1C_IW_SLC__1SDV_20250715T153939_20250715T154006_003233_006886_8C4E.SAFE.zip -Psubswath=IW1 -Pburst1=2 -Pburst2=4 -Pcoherence_fpath=D:\pcm\data\s1\output\20250709_20250715_IW1_B24_MTC.tif

s1coherence.xml (18.9 KB)

4

A Jira ticket has already been opened for this issue: SNAP-4106

1 Like
5

@diana_harosa any update on this issue?

6

Unfortunately this issue hasn’t been fixed yet. We’ll try to include a fix in a future update. Thank you for your patience.

8

The problem was caused by CreateStack operator. Maybe you can replace it with Collocate operator in your graph.

9

I’m using SNAP12 for the graphs using createstack and I’d like to avoid changing the graphs. I’d rather wait for a fix than implementing a work around.