Java 如何从ncml创建长度可变的netCDF-4文件?
我正在尝试编写一个具有可变长度变量的netCDF-4文件 理想情况下,我会使用ncgen实用程序,但它不支持ncml输入。因此,我使用的是netCDF java lib 4.6.6。以下不带可变长度变量的ncml生成可用的netCDF-4文件:Java 如何从ncml创建长度可变的netCDF-4文件?,java,dataset,netcdf,scientific-computing,ncml,Java,Dataset,Netcdf,Scientific Computing,Ncml,我正在尝试编写一个具有可变长度变量的netCDF-4文件 理想情况下,我会使用ncgen实用程序,但它不支持ncml输入。因此,我使用的是netCDF java lib 4.6.6。以下不带可变长度变量的ncml生成可用的netCDF-4文件: java -Xmx1g -classpath ~/dump/netcdfAll-4.6.6.jar ucar.nc2.dataset.NetcdfDataset -in test.ncml -out test.nc4 -netcdf4 这是相应的ncm
java -Xmx1g -classpath ~/dump/netcdfAll-4.6.6.jar ucar.nc2.dataset.NetcdfDataset -in test.ncml -out test.nc4 -netcdf4
这是相应的ncml/xml:
<?xml version="1.0" encoding="UTF-8"?>
<netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://what.no">
<group name="data">
<dimension name="number_packets" length="6"/>
<variable name="packet_time_utc" shape="number_packets" type="double">
</variable>
</group>
</netcdf>
按照建议指定length=“*”
,会导致不同的NumberFormatException错误
我正在使用可用的最新版本:
- HDF 1.8.17
- netcdf C 4.4.0
- netCDF java lib 4.6.6
错误是由于找不到变量(FileWrite希望复制所有变量)。然而,我一直在努力寻找错误的根源。我用netCDF java lib分支5.0.0再现了这一点;提交0cc266d,但错误更清楚一些: 第二个例子是:
java.lang.IllegalArgumentException: Dimensions added to a group must be shared.
删除isShared=“false”
在我看来,目前还没有支持。不幸的是,我们在NetCDF Java中不支持这一点。我在上发了一个问题。谢谢(我还没有足够的代表投票)
NetcdfDatataset read from test-vlen.ncml write to test-Vlen.nc4 java.io.IOException: -49: NetCDF: Variable not found
at ucar.nc2.jni.netcdf.Nc4Iosp.writeData(Nc4Iosp.java:2835)
at ucar.nc2.jni.netcdf.Nc4Iosp.writeData(Nc4Iosp.java:2789)
at ucar.nc2.NetcdfFileWriter.write(NetcdfFileWriter.java:954)
at ucar.nc2.NetcdfFileWriter.write(NetcdfFileWriter.java:938)
at ucar.nc2.FileWriter2.copyAll(FileWriter2.java:431)
at ucar.nc2.FileWriter2.copyVarData(FileWriter2.java:384)
at ucar.nc2.FileWriter2.write(FileWriter2.java:199)
at ucar.nc2.dataset.NetcdfDataset.main(NetcdfDataset.java:1888)
Exception in thread "main" java.io.IOException: -101: NetCDF: HDF error
at ucar.nc2.jni.netcdf.Nc4Iosp.close(Nc4Iosp.java:289)
at ucar.nc2.NetcdfFileWriter.abort(NetcdfFileWriter.java:1032)
at ucar.nc2.FileWriter2.write(FileWriter2.java:207)
at ucar.nc2.dataset.NetcdfDataset.main(NetcdfDataset.java:1888)
java.lang.IllegalArgumentException: Dimensions added to a group must be shared.
java.lang.IllegalArgumentException: variable length dimension cannot be shared or unlimited