Null Point Exception from S1 image

Microwave Toolbox
1

SNAP 9.0.0

I’m getting a NulPointerException when trying to apply Range Doppler Correction tool to an S1 image. I have already applied the orbit correction and speckle filter (gamma map, 7x7 kernel). I clicked on “report error” and it directed me here.

image
image1337×873 127 KB

Exception text:

java.lang.NullPointerException
	at org.esa.s1tbx.sar.gpf.geometric.RangeDopplerGeocodingOp.getBandUnit(RangeDopplerGeocodingOp.java:1530)
	at org.esa.s1tbx.sar.gpf.geometric.RangeDopplerGeocodingOp.computeTileStack(RangeDopplerGeocodingOp.java:960)
Caused: org.esa.snap.core.gpf.OperatorException
	at org.esa.snap.engine_utilities.gpf.OperatorUtils.catchOperatorException(OperatorUtils.java:434)
	at org.esa.s1tbx.sar.gpf.geometric.RangeDopplerGeocodingOp.computeTileStack(RangeDopplerGeocodingOp.java:1104)
	at org.esa.snap.core.gpf.internal.OperatorImageTileStack.computeRect(OperatorImageTileStack.java:122)
	at org.esa.snap.core.gpf.internal.OperatorImageTileStack.computeTile(OperatorImageTileStack.java:86)
Caused: org.esa.snap.core.gpf.OperatorException: java.lang.NullPointerException
	at org.esa.snap.core.gpf.internal.OperatorExecutor$GPFImagingListener.errorOccurred(OperatorExecutor.java:381)
	at com.sun.media.jai.util.SunTileScheduler.sendExceptionToListener(Unknown Source)
	at com.sun.media.jai.util.SunTileScheduler.scheduleTile(Unknown Source)
	at javax.media.jai.OpImage.getTile(Unknown Source)
	at javax.media.jai.PlanarImage.getData(Unknown Source)
	at com.bc.ceres.glevel.MultiLevelImage.getData(MultiLevelImage.java:64)
	at org.esa.snap.core.gpf.internal.OperatorContext.getSourceTile(OperatorContext.java:449)
	at org.esa.snap.core.gpf.internal.OperatorContext.getSourceTile(OperatorContext.java:435)
	at org.esa.snap.core.gpf.internal.OperatorImage.computeRect(OperatorImage.java:75)
	at javax.media.jai.SourcelessOpImage.computeTile(Unknown Source)
	at com.sun.media.jai.util.SunTileScheduler.scheduleTile(Unknown Source)
	at javax.media.jai.OpImage.getTile(Unknown Source)
	at com.sun.media.jai.util.RequestJob.compute(Unknown Source)
[catch] at com.sun.media.jai.util.WorkerThread.run(Unknown Source)

Edit: I have tried many different options (different DEMs, etc.) and always get the same result. Here is my
messages.log (393.9 KB)

Edit: it seems the “Apply radiometric normalization” option is the problem. If I uncheck this, it works, with any DEM. Checking this box produces the error.

2

Hi Glen, I am facing the same issue even with the latest version (SNAP 11). Can you please help me understand how to solve this?

3

As per the original message, uncheck the “Apply radiometric normalization” option in the terrain correction tool options. This is a legacy option since radiometric normalisation is already performed in the calibration step.

1 Like
4

Thank you for your kind help and quick response.