Re: THREDDS : need help for aggregation

• To: Tony Jolibois <tjolibois@xxxxxx>
• Subject: Re: THREDDS : need help for aggregation
• From: John Caron <caron@xxxxxxxxxxxxxxxx>
• Date: Wed, 08 Mar 2006 08:48:27 -0700

Hi Tony:

Can you figure out if theres a problem with the TDS vs a problem with ferret?

A couple of ways of doing that:
 1) use the browser interface to look at the TDS output to see if its what you 
expect.
 2) use another dods client like the Nj22 ToolsUI.

Since I dont know how ferret works, its hard for me to figure out this problem.




Tony Jolibois wrote:

    John,

This version seems to be very interesting, thank you !
I need little help to reproduce the actual aggregations :

The configuration I try is this :

<?xml version="1.0" encoding="UTF-8"?>
<catalog name="THREDDS Server Default Catalog"

xmlns="http://www.unidata.ucar.edu/namespaces/thredds/InvCatalog/v1.0";

        xmlns:xlink="http://www.w3.org/1999/xlink";>

<service name="ncdods" serviceType="OPENDAP" base="/thredds/dodsC/" />

<dataset name="Mercator Psy2v1 Aggregation" ID="mercator_psy2v1_vitrine_id" urlPath="mercatorPsy2v1R1v_nat_mean_best_estimate">

  <serviceName>ncdods</serviceName>

  <dimension name="time" length="0"/>
  <variable name="time" type="String" shape="time">
    <attribute name="_CoordinateAxisType" value="Time" />
  </variable>

  <netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";>
   <aggregation dimName="time" type="joinNew">
     <variableAgg name="temperature" />

<scan dateFormatMark="mercatorPsy2v1R1v_nat_mean_#yyyyMMdd" location="/data/mercator/tomcat/webapps/dodsC/data/mercator_psy2v1_vitrine/nat_agg/" suffix=".nc" />

   </aggregation>
  </netcdf>

   </dataset>
</catalog>

The directory of the scan location contains 28 files like mercatorPsy2v1R1v_nat_mean_20050111_R20041229.nc with 1rst date increasing (day per day).

With all this I get an error from ferret :

yes? use "http://opendap-dev.cls.fr:8480/thredds/dodsC/mercatorPsy2v1R1v_nat_mean_best_estimate";

 ** netCDF error:
 time
yes? show data
     currently SET data sets:

1> http://opendap-dev.cls.fr:8480/thredds/dodsC/mercatorPsy2v1R1v_nat_mean_best_estimate (default)

 name     title                             I         J         K         L
 TIME                                      ...       ...       ...       ...
       (invalid coordinate axis)
 TEMPERATURE

temperature 1:652 1:463 1:43 1:28 yes? show grid temperature

    GRID GSK4
 name       axis              # pts   start                end
 LONGITUDE LONGITUDE          652mi   98.5W(-98.5)         9.999E(10)
 LATITUDE  LATITUDE           463 i   9.127N               64.937N
 DEPTH     DEPTH (m)           43 i-  0                    5500
 TIME      T                   28 r   1                    28

I don't know how can I have date like 2005-01-11 in the grid.
Can you tell me how can I do this ?

Thanks for your help,
Tony

John Caron wrote:

Tony Jolibois wrote:

   Hi John and thredds community,

Does the thredds Opendap server have aggregation functionnality now (see question below) ? I'm waiting for the new version to upgrade my operationnal sever (example here http://opendap.aviso.oceanobs.com).

Best regards,
Tony

Yes, the "THREDDS Data Server" (TDS) has the functionality of the old "Aggregation Server", but it used NcML to specify the aggregation. See:

 http://www.unidata.ucar.edu/projects/THREDDS/tech/index.html#TDS

and follow links to :

 http://motherlode.ucar.edu:8080/thredds/docs/
 http://motherlode.ucar.edu:8080/thredds/docs/NcML.htm

--
Tony Jolibois

CLS - Direction Océanographie Spatiale
8-10 rue hermès - 31520 Ramonville Saint-Agne
tjolibois@xxxxxx

Tél : +33 (0) 561 393 797
Fax : +33 (0) 561 393 782

• References:
  • Re: THREDDS
    • From: John Caron