On 5/11/2012 10:23 AM, Dave Neufeld wrote:
Hi All,
I'm trying to better understand how to use
FeatureDatasetFactoryManager. Currently in NetCDF 4.2 when using
FeatureDatasetFactoryManager.findFeatureType(ncd) I'm getting a null
returned from my test dataset which is a grid. How is the featureType
determined by, reading some internal data structure, or does
cdm_data_type attribute need to popopulated, or ?
Thanks, Dave
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Its really a helper routine to FeatureDatasetFactoryManager.open(). Its
job is to look for global attributes that say what it is:
/**
* Try to determine the feature type of the dataset, by looking at
its metadata.
* @param ncd the dataset
* @return FeatureType if found, else null
*/
static public FeatureType findFeatureType(NetcdfDataset ncd) {
// look for explicit guidance
String cdm_datatype = ncd.findAttValueIgnoreCase(null,
"cdm_data_type", null);
if (cdm_datatype == null)
cdm_datatype = ncd.findAttValueIgnoreCase(null, "cdm_datatype",
null);
if (cdm_datatype == null)
cdm_datatype = ncd.findAttValueIgnoreCase(null,
"thredds_data_type", null);
if (cdm_datatype != null) {
for (FeatureType ft : FeatureType.values())
if (cdm_datatype.equalsIgnoreCase(ft.name())) {
if (debug) System.out.println(" wrapUnknown found
cdm_datatype " + cdm_datatype);
return ft;
}
}
// LOOK - compare to CF names when those are finalized
String ftypeS = ncd.findAttValueIgnoreCase(null, CF.FEATURE_TYPE,
null);
if (ftypeS == null)
ftypeS = ncd.findAttValueIgnoreCase(null, CF.featureTypeAtt2, null);
if (ftypeS == null)
ftypeS = ncd.findAttValueIgnoreCase(null, CF.featureTypeAtt3, null);
if (ftypeS != null) {
if (debug) System.out.println(" wrapUnknown found cf_datatype " +
ftypeS);
return FeatureType.getType(ftypeS);
}
return null;
}
