When using the "Spatial Subset from View" functionality on S3 SLSTR Level2 LST data, it can happen that an error occurs. It depends which area is currently shown in the view, if both swath borders are visible then it works. If only one is visible then an Exception occurs.
java.lang.NegativeArraySizeException at org.esa.snap.core.datamodel.TiePointGrid.createSubset(TiePointGrid.java:1016) at org.esa.snap.core.dataio.ProductSubsetBuilder.addTiePointGridsToProduct(ProductSubsetBuilder.java:644) at org.esa.snap.core.dataio.ProductSubsetBuilder.createProduct(ProductSubsetBuilder.java:473) at org.esa.snap.core.dataio.ProductSubsetBuilder.readProductNodesImpl(ProductSubsetBuilder.java:237) at org.esa.snap.core.dataio.AbstractProductReader.readProductNodes(AbstractProductReader.java:169) at org.esa.snap.core.dataio.AbstractProductBuilder.readProductNodes(AbstractProductBuilder.java:78)
A sample product to reproduce this issue is: S3A_SL_2_LST___20180825T183051_20180825T201150_20180827T014020_6059_035_070_____LN2_O_NT_003
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28 Aug 2018, 01:48 pm
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Tonio Fincke1 October 2018 at 09:39
I have added hard-coded values that correspond to those from SLSTR L1B. This places the tie-point grids correctly and enables users to create subsets. However, it is just a workaround until we can read the correct values from the metadata file.
Marco Peters3 September 2018 at 08:41
We were told that the values in Level2 shall be the same as in the Level1 product. The data format might be updated in the future but till then we need to add constant values to the code.
Marco Peters28 August 2018 at 13:49
The origin of this problem is missing information in the LST data. The tie-points cannot be correctly positioned in relation to the scene image.
When using the "Spatial Subset from View" functionality on S3 SLSTR Level2 LST data, it can happen that an error occurs. It depends which area is currently shown in the view, if both swath borders are visible then it works. If only one is visible then an Exception occurs.
java.lang.NegativeArraySizeException
at org.esa.snap.core.datamodel.TiePointGrid.createSubset(TiePointGrid.java:1016)
at org.esa.snap.core.dataio.ProductSubsetBuilder.addTiePointGridsToProduct(ProductSubsetBuilder.java:644)
at org.esa.snap.core.dataio.ProductSubsetBuilder.createProduct(ProductSubsetBuilder.java:473)
at org.esa.snap.core.dataio.ProductSubsetBuilder.readProductNodesImpl(ProductSubsetBuilder.java:237)
at org.esa.snap.core.dataio.AbstractProductReader.readProductNodes(AbstractProductReader.java:169)
at org.esa.snap.core.dataio.AbstractProductBuilder.readProductNodes(AbstractProductBuilder.java:78)
It is reported in the forum:
https://forum.step.esa.int/t/work-with-data-s3a-sl-2-lst-in-snap/11313
A sample product to reproduce this issue is: S3A_SL_2_LST___20180825T183051_20180825T201150_20180827T014020_6059_035_070_____LN2_O_NT_003