Re: [thredds] NcML aggregation error

• To: thredds@xxxxxxxxxxxxxxxx
• Subject: Re: [thredds] NcML aggregation error
• From: Ethan Davis <edavis@xxxxxxxxxxxxxxxx>
• Date: Wed, 18 Jan 2012 11:40:43 -0700

Hi Glenn,

Try changing the aggregation's "dimName" value to "time", it needs to
match an existing dimension name. Also, the aggregation will create a
coordinate variable, i.e. one whose name matches the name of its only
dimension, "time(time)". So, to add attributes to the new coordinate
variable, you will need to change the name of your new "aggTime"
variable to "time".

Your NcML below is aggregating a single dataset. Is this just an example
but you plan to aggregate multiple files? Or are you trying to add
coordinate variables to a single existing dataset?

If the latter, it would be better to declare the new "time" variable as
you did "aggTime" below and specify the values with a "values" element
rather than use an aggregation. Aggregations are much heavier weight
than an NcML dataset that simply modifies an existing dataset.

Hope that helps,

Ethan

On 1/10/2012 8:01 AM, Comiskey, Glenn wrote:
> Hi,
>  
> Dataset info:
>  dimensions:
>    time = UNLIMITED;   // (73 currently)
>    s_rho = 32;
>    eta_rho = 242;
>    xi_u = 289;
>    eta_v = 241;
>    xi_rho = 290;
>  variables:
>    float u(time=73, s_rho=32, eta_rho=242, xi_u=289);
>    float v(time=73, s_rho=32, eta_v=241, xi_rho=290);
> Note: No coordinate variables are declared.
>  
> NcML aggregation:
> <netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";>
> <variable name="aggtime">
> <attribute name="units" value="hours since 2010-12-08T08:00:00Z"/>
> <attribute name="_CoordinateAxisType" value="Time"/>
> </variable>
> <aggregation dimName="aggtime" type="joinExisting">
> <netcdf location="C:/aroms/fsct_malaysia_2010122708_2010123008.nc"
> coordValue="0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
> 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46
> 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70
> 71 72"/>
> </aggregation>
> </netcdf>
>  
> threddsServlet.log:
> 2012-01-10T14:51:08.323 +0000 [     22812][      14] INFO  -
> thredds.server.opendap.OpendapServlet - doGet(): Remote host: 127.0.0.1
> - Request: "GET /thredds/dodsC/roms2/roms2.nc.html HTTP/1.1"
> 2012-01-10T14:51:08.340 +0000 [     22829][      14] INFO  -
> thredds.server.opendap.OpendapServlet - Request Completed - 404 - -1 - 17
>  
> Can anyone explain why I get the HTTP 404 error.
>  
> Kind regards,
>  
> Glenn Comiskey
> Data System Administrator
> 
> 
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-- 
Ethan Davis                                       UCAR Unidata Program
edavis@xxxxxxxxxxxxxxxx                    http://www.unidata.ucar.edu

• References:
  • [thredds] NcML aggregation error
    • From: Comiskey, Glenn