From an e-mail: "The S3MPC operators raise an issue concerning the handling of Sentinel 3 SYNERGY VG1 products (S3A_SY_2_VG1____[..]). Whereas SNAP was able to open these files last year, it is now impossible to open this file through the manifest and impossible to open individually any of the included files.

There have been an evolution of this processing beginning of the year and it seems that the updated VG1 files are no longer accepted by SNAP. However, no modification of format have been included in VG1 file – except maybe a correction about the Plate-Carrée resolution.

Can you please have a look?

I have the following error message if I tried to open a recent VG1 product with SNAP :

“java.lang.IllegalStateException

at ucar.nc2.iosp.IospHelper.readData(IospHelper.java:396)

at ucar.nc2.iosp.IospHelper.readDataFill(IospHelper.java:292)

at ucar.nc2.iosp.hdf5.H5iosp.readData(H5iosp.java:163)

at ucar.nc2.iosp.hdf5.H5iosp.readData(H5iosp.java:141)

at ucar.nc2.NetcdfFile.readData(NetcdfFile.java:1957)

at ucar.nc2.Variable.reallyRead(Variable.java:841)

at ucar.nc2.Variable._read(Variable.java:813)

at ucar.nc2.Variable.read(Variable.java:691)

at org.esa.s3tbx.dataio.s3.util.S3NetcdfReader.addVariableMetadata(S3NetcdfReader.java:510)

at org.esa.s3tbx.dataio.s3.util.S3NetcdfReader.addBands(S3NetcdfReader.java:215)

at org.esa.s3tbx.dataio.s3.util.S3NetcdfReader.readProductNodesImpl(S3NetcdfReader.java:65)

at org.esa.snap.core.dataio.AbstractProductReader.readProductNodes(AbstractProductReader.java:169)

at org.esa.s3tbx.dataio.s3.synergy.VgtProductFactory.readProduct(VgtProductFactory.java:94)

at org.esa.s3tbx.dataio.s3.AbstractProductFactory.readProducts(AbstractProductFactory.java:406)

at org.esa.s3tbx.dataio.s3.AbstractProductFactory.createProduct(AbstractProductFactory.java:82)

at org.esa.s3tbx.dataio.s3.Sentinel3ProductReader.createProduct(Sentinel3ProductReader.java:95)

at org.esa.s3tbx.dataio.s3.Sentinel3ProductReader.readProductNodesImpl(Sentinel3ProductReader.java:83)

at org.esa.snap.core.dataio.AbstractProductReader.readProductNodes(AbstractProductReader.java:169)

at org.esa.snap.core.dataio.ProductIO.readProduct(ProductIO.java:161)

at org.esa.snap.rcp.actions.file.ReadProductOperation.run(ReadProductOperation.java:51)

at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)

at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)

at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)

[catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)”"

A first investigation showed that the problem occurs because the netcdf files now have a variable "crs" which is encoded as string, which cannot be read by our netcdf library.