Re: [thredds] NetCDF Subset service

• To: Terry.Rankine@xxxxxxxx
• Subject: Re: [thredds] NetCDF Subset service
• From: Christian Ward-Garrison <cwardgar@xxxxxxxx>
• Date: Thu, 24 Jul 2014 17:49:29 -0600

Hi Terry,

You might expect that when you request all of the data in a dataset, NCSS
will simply return the original dataset (no subsetting required). That's
not how NCSS works; instead, it will always create a new dataset, and copy
over the requested data (which could potentially be everything) from the
original.

In this scenario, you might notice that the original and new datasets are
*structurally* different (i.e. different attributes, scale factors, etc),
but they are *semantically* equal (i.e. they contain the same data, though
it might be represented differently).

As far as I can tell, your 2 example files are semantically equal. Are you
struggling with structural equality issues?

Cheers,
Christian



On Mon, Jul 21, 2014 at 12:46 AM, <Terry.Rankine@xxxxxxxx> wrote:

> Hi Guys
>
>
>
> Is there any other users currently using the netCDF subset service? I am
> having quite a few issues with it and would like to check ‘it’s not just me’
>
>
>
> This:
>
> http://vhirl-dev.csiro.au/thredds/fileServer/dem/busselton-final.nc
>
>
>
> is very very different to this:
>
>
> http://vhirl-dev.csiro.au/thredds/ncss/grid/dem/busselton-final.nc?var=elevation&north=-29.2729&west=113.5915&east=116.2396&south=-35.2422&horizStride=1&accept=netcdf4
>
>
>
> How are others handling THREDDS and CRS changes?
>
>
>
> Regards
>
> Terry
>
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