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
_______________________________________________
thredds mailing list
thredds@xxxxxxxxxxxxxxxx
For list information or to unsubscribe, visit:
http://www.unidata.ucar.edu/mailing_lists/
<?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>
