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Re: [thredds] Retrieve THREDDS metada from the NetCDF file

On 3/8/2012 6:56 AM, Kristian Sebastián wrote:
Hi Rich,

Actually, our Thredds thredds.socib.es <http://thredds.socib.es> have the ncISO services enable. So, I think the ncISO doesn't add "Time coverage", "Geospatial coverage" and "variables" metadata (link to the dataset example http://thredds.socib.es/thredds/catalog/mooring/oceanographic_buoy/buoy_bahiadepalma-ime_buoy001/L1/catalog.html?dataset=mooring/oceanographic_buoy/buoy_bahiadepalma-ime_buoy001/L1/dep0003_buoy-bahiadepalma_ime-buoy001_L1_latest.nc):


        Catalog
        
http://thredds.socib.es/thredds/catalog/mooring/oceanographic_buoy/buoy_bahiadepalma-ime_buoy001/L1/catalog.html


        Dataset: L1/dep0003_buoy-bahiadepalma_ime-buoy001_L1_latest.nc

      * /Data size: /1.298 Mbytes
      * /Data type: /STATION
      * /ID:
        
/mooring/oceanographic_buoy/buoy_bahiadepalma-ime_buoy001/L1/dep0003_buoy-bahiadepalma_ime-buoy001_L1_latest.nc


          Access:

     1. *OPENDAP:*
        
/thredds/dodsC/mooring/oceanographic_buoy/buoy_bahiadepalma-ime_buoy001/L1/dep0003_buoy-bahiadepalma_ime-buoy001_L1_latest.nc
        
<http://thredds.socib.es/thredds/dodsC/mooring/oceanographic_buoy/buoy_bahiadepalma-ime_buoy001/L1/dep0003_buoy-bahiadepalma_ime-buoy001_L1_latest.nc.html>
     2. *HTTPServer:*
        
/thredds/fileServer/mooring/oceanographic_buoy/buoy_bahiadepalma-ime_buoy001/L1/dep0003_buoy-bahiadepalma_ime-buoy001_L1_latest.nc
        
<http://thredds.socib.es/thredds/fileServer/mooring/oceanographic_buoy/buoy_bahiadepalma-ime_buoy001/L1/dep0003_buoy-bahiadepalma_ime-buoy001_L1_latest.nc>
     3. *NCML:*
        
/thredds/ncml/mooring/oceanographic_buoy/buoy_bahiadepalma-ime_buoy001/L1/dep0003_buoy-bahiadepalma_ime-buoy001_L1_latest.nc
        
<http://thredds.socib.es/thredds/ncml/mooring/oceanographic_buoy/buoy_bahiadepalma-ime_buoy001/L1/dep0003_buoy-bahiadepalma_ime-buoy001_L1_latest.nc>
     4. *UDDC:*
        
/thredds/uddc/mooring/oceanographic_buoy/buoy_bahiadepalma-ime_buoy001/L1/dep0003_buoy-bahiadepalma_ime-buoy001_L1_latest.nc
        
<http://thredds.socib.es/thredds/uddc/mooring/oceanographic_buoy/buoy_bahiadepalma-ime_buoy001/L1/dep0003_buoy-bahiadepalma_ime-buoy001_L1_latest.nc>
     5. *ISO:*
        
/thredds/iso/mooring/oceanographic_buoy/buoy_bahiadepalma-ime_buoy001/L1/dep0003_buoy-bahiadepalma_ime-buoy001_L1_latest.nc
        
<http://thredds.socib.es/thredds/iso/mooring/oceanographic_buoy/buoy_bahiadepalma-ime_buoy001/L1/dep0003_buoy-bahiadepalma_ime-buoy001_L1_latest.nc>


          Dates:

      * 2012-03-08 13:20:02Z *(modified)*


          Properties:

      * viewer =
        "http://www.socib.es/jwebchart/webncdump/?file={url},webncdump
        <http://www.socib.es/jwebchart/webncdump/?file=%7Burl%7D,webncdump>"
      * viewer2 = "http://www.socib.es/jwebchart/?file={url},jwebchart
        <http://www.socib.es/jwebchart/?file=%7Burl%7D,jwebchart>"


          Viewers:

      * NetCDF-Java ToolsUI (webstart)
        
<http://thredds.socib.es/thredds/view/ToolsUI.jnlp?catalog=http://thredds.socib.es/thredds/catalog/mooring/oceanographic_buoy/buoy_bahiadepalma-ime_buoy001/L1/catalog.xml&dataset=mooring/oceanographic_buoy/buoy_bahiadepalma-ime_buoy001/L1/dep0003_buoy-bahiadepalma_ime-buoy001_L1_latest.nc>
      * webncdump
        
<http://www.socib.es/jwebchart/webncdump/?file=http://thredds.socib.es/thredds/dodsC/mooring/oceanographic_buoy/buoy_bahiadepalma-ime_buoy001/L1/dep0003_buoy-bahiadepalma_ime-buoy001_L1_latest.nc>
      * jwebchart
        
<http://www.socib.es/jwebchart/?file=http://thredds.socib.es/thredds/dodsC/mooring/oceanographic_buoy/buoy_bahiadepalma-ime_buoy001/L1/dep0003_buoy-bahiadepalma_ime-buoy001_L1_latest.nc>


But, we have configured a Forecast Model Run (http://thredds.socib.es/thredds/catalog/operational_models/oceanographical/hydrodynamics/model_run_aggregation/wmed/catalog.html?dataset=operational_models/oceanographical/hydrodynamics/model_run_aggregation/wmed/wmed_best.ncd) Collection following the Feature Collection Tutorial <http://www.unidata.ucar.edu/projects/THREDDS/tech/tds4.2/tutorial/FeatureCollectionsTutorial.html>. As you can see, the "TimeCoverage", "GeospatialCoverage" and "Variables" metadata is displayed.


          Variables:

      * /Vocabulary/ [CF-1.0]:
          o *dens* = /potential density/ = sea_water_potential_density
            (kg m-3)
          o *salt* = /salinity/ = sea_water_salinity
          o *temp* = /potential temperature/ =
            sea_water_potential_temperature (Celsius)
          o *u* = /u-momentum component/ = eastward_sea_water_velocity
            (meter second-1)
          o *ubar* = /vertically integrated u-momentum component/ =
            barotropic_eastward_sea_water_velocity (meter second-1)
          o *v* = /v-momentum component/ =
            northward_sea_water_velocity (meter second-1)
          o *vbar* = /vertically integrated v-momentum component/ =
            barotropic_northward_sea_water_velocity (meter second-1)
          o *zeta* = /free-surface/ =
            sea_surface_height_above_sea_level (meter)


          GeospatialCoverage:

      * /Longitude: /-5.8 to 9.2 degrees_east
      * /Latitude: /34.9 to 44.70621220623353 degrees_north


          TimeCoverage:

      * /Start: /2012-03-06 00:00:00Z
      * /End: /2012-03-10 00:00:00Z
      * /Duration: /4.0 days

So, I don't know why the metadata is displayed in the feature collections and not in the other datasets.


Hi Kristian:

Feature collections know how to add these 3 metadata elements automaticallly, because they understand "what the data is", eg how to extract that info. You have to add this manually for plain ole datasets. i think that for the TDS, the future is all about feature collections.

John

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