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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Hi Kyle,In string_type.nc, you've attached the cf_role=="timeseries_id" attribute to feature_type_instance, and you declare it like this:
String feature_type_instance(feature_type_instance=1);
:cf_role = "timeseries_id";
:long_name = "Identifier for each feature type instance";
In the case of a single-timeseries dataset, where station variables such
as lon, lat, and alt are declared as scalars, the "timeseries_id"
variable must also be a scalar. So, the variable should be declared like
this:
String feature_type_instance;
:cf_role = "timeseries_id";
:long_name = "Identifier for each feature type instance";
The only exception to this rule is if the "timeseries_id" variable is of
type CHAR, in which case it can be a 1D array (as in char_type.nc).
I've attached a small NCML file that fixes string_type.nc by removing the feature_type_instance dimension and converting the feature_type_instance variable to a scalar. Be sure to change the value of the netcdf:location attribute to the path of the file on your machine.
Cheers, Christian Ward-Garrison On 12/12/2013 1:27 PM, Kyle Wilcox wrote:
I have two files where the only difference is the variable type of the
"feature_type_instance" variable.
When using a Char array, it works just fine.
When using a String, NCJ fails to find a StructureRecord:
java.lang.IllegalStateException: Cant find Structure record
at
ucar.nc2.ft.point.standard.Table$TableStructure.<init>(Table.java:253)
at ucar.nc2.ft.point.standard.Table.factory(Table.java:110)
at ucar.nc2.ft.point.standard.NestedTable.<init>(NestedTable.java:98)
at
ucar.nc2.ft.point.standard.TableAnalyzer.analyze(TableAnalyzer.java:406)
at
ucar.nc2.ft.point.standard.TableAnalyzer.factory(TableAnalyzer.java:294)
at
ucar.nc2.ft.point.standard.PointDatasetStandardFactory.isMine(PointDatasetStandardFactory.java:114)
at
ucar.nc2.ft.FeatureDatasetFactoryManager.wrap(FeatureDatasetFactoryManager.java:272)
at
ucar.nc2.ft.FeatureDatasetFactoryManager.open(FeatureDatasetFactoryManager.java:243)
You can try loading each file into the FeatureTypes/PointFeature tab to
see the stacktrace from the String file (I've attached them).
Based on CF docs
(http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.6/cf-conventions.html#coordinates-metadata)
it states:
"The variable carrying the cf_role attribute may have any data type."
Is this a bug in NCJ?
Thanks,
Kyle
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<?xml version="1.0" encoding="UTF-8"?> <netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2"; location="C:/Users/cwardgar.UNIDATA_DOMAIN/Desktop/string_type.nc"> <remove name="feature_type_instance" type="dimension"/> <variable name="feature_type_instance" shape=""/> </netcdf>
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