[thredds] HDF5 Aggregation

[John Caron]

thanks Rich, for answering that question.

BTW, im noticing that a number of email servers are refusing messages with zip attachments, since thats a possible security problem. Probably best to just include the URL when you want to provide a zip file. thanks.

Rich Signell wrote:
> Dave,
> 
> I've been working on a similar problem:  using NcML to make the HDF
> remote sensing imagery served by the NOAA Coastwatch East Coast
> OpenDAP server CF-compliant.
> 
> I have been using aggregation type="union" to join the HDF data with a
> netcdf file that contains the lon/lat values, since Coastwatch uses
> the same non-uniform lon/lat grid (it's a uniform mercator grid).
> 
> The NcML looks like this:
> 
> <netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2">
>     <aggregation type="union">
>         <netcdf
> location="http://coast-enviro.er.usgs.gov/models/gom_interop/coastwatch_northeast_lonlat.nc"/>
>         <netcdf
> location="http://coastwatch.chesapeakebay.noaa.gov/dap/edac/avhrr/data/2008_135_0921_noaa15_ex1_sst.hdf"/>
>      </aggregation>
> </netcdf>
> 
> I can also aggregate the HDF5 images along a virtual time dimension
> and then union with the netcdf file that has the lon/lat values, and
> it works -- only remaining issue is that the scale_factor is lost for
> some reason, which I'm looking into.
> 
> Try getting http://coast-enviro.er.usgs.gov/models/share/coastwatch.zip
> and running "test_sst", then looking at the two NcML files "sst.ncml"
> 
> -Rich
> 
> On Fri, May 30, 2008 at 9:20 AM, David Robertson
> <robertson at marine.rutgers.edu> wrote:
>> Hi,
>>
>> If I want to serve aggregated HDF5 files, do I have to specify the
>> coordinate system (grid) with NcML, or is there a way to construct the
>> HDF5 file so THREDDS can get the coordSys directly from the HDF5 file? I
>> ask because if my only option is NcML I will ask my "data source" to
>> create NetCDF files instead since the coverage area is 1222 x 1183
>> points and they are not equal spaced.
>>
>> Thanks,
>> Dave
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> 
> 
> 
> 
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