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Re: [netcdf-java] Problem with aggregation by longitude dimension

But ....
you can aggregate in the inner dimension using tilled aggregation. Here is the aggregation using your dataset: 
<?xml version='1.0' encoding='UTF-8'?>
<netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";>
<aggregation dimName="lon" type="tiled">
<netcdf section="(0:349)" location="http://oceandata.azti.es:8080/thredds/dodsC/files/monthly_Wx.nc"; /> <netcdf section="(350:600)" location="http://oceandata.azti.es:8080/thredds/dodsC/files/monthly_E.nc"/> 
</aggregation>
</netcdf>
basically you miss to provide the attibute section which is required for tiled aggregations:
The *section* attribute is used only for tiled aggregations, and describes which section of the entire dataset this dataset represents. The section value follows the ucar.ma2.Section /section spec/ (see javadocs), eg "(1:20,:,3)", parenthesis optional
May be the ncml doc needs to clarify that the tiledAggregation could be done in more than one dimension, and the section attribute has the same rank and order of the dimName attribute for the aggregation element. 

Regards

Antonio

--
Antonio S. Cofiño
Grupo de Meteorología de Santander
Dep. de Matemática Aplicada y
        Ciencias de la Computación
Universidad de Cantabria
Escuela de Caminos
Avenida de los Castros, 44
39005 Santander, Spain
Tel: (+34) 942 20 1731
Fax: (+34) 942 20 1703
http://www.meteo.unican.es
mailto:antonio.cofino@xxxxxxxxx


El 04/04/2012 20:11, "Antonio S. Cofiño" escribió:

Dear Yolanda,

From the ncml doc you can read
http://www.unidata.ucar.edu/software/netcdf/ncml/v2.2/AnnotatedSchema4.html
The /forecastModelRunCollection, forecastModelRunSingleCollection, joinExisting /and/joinNew/ aggregation types are called */outer aggregations/* because they work on the outer (first) dimension.
Therefore, looking at your data you can aggregate using the time (outer) dimension but not the lon (inner)dimension. 

For the tiled aggregation, I don't have yet an answer.

Regards

Antonio




--
Antonio S. Cofiño
Grupo de Meteorología de Santander
Dep. de Matemática Aplicada y
        Ciencias de la Computación
Universidad de Cantabria
Escuela de Caminos
Avenida de los Castros, 44
39005 Santander, Spain
Tel: (+34) 942 20 1731
Fax: (+34) 942 20 1703
http://www.meteo.unican.es
mailto:antonio.cofino@xxxxxxxxx


El 04/04/2012 10:30, Yolanda Sagarminaga escribió:

Hello,
I have a problem with aggregation by longitude dimension of two netcdf files:
The first one ranges from -35 to 0 (originally from 350 to 360, but I changed it) and the second one from 0 to 25 

The HTML Access to files and aggregations is in:

http://oceandata.azti.es:8080/thredds/MONTHLY_SEAWIFS_9km.html
My aggregation ncml code is below, I already did an joinexisting aggregation by latitude with other datasets with success, but I cannot make it work this one: I don't know if the error comes from longitude units, from files or from aggregation. Someone could help me? 





<dataset name="JOINEXISTING AGGREGATION" ID="Agg2.nc" urlPath="Agg2.nc">

<serviceName>allServices</serviceName>

<netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";>

<aggregation dimName="lon" type="joinExisting">
<netcdf location="file:/media/HIST_DATA/SEAWIFS_MONTHLY_9km_BB/monthly_E.nc" />
<netcdf location="file:/media/HIST_DATA/SEAWIFS_MONTHLY_9km_BB/monthly_Wx.nc" />
<!--<scan location="/media/HIST_DATA/SEAWIFS_MONTHLY_9km_BB/" suffix=".nc" subdirs="false"/>--> 

</aggregation>

</netcdf>

</dataset>



In case of I also tried the tiled aggregation without success....



<dataset name="TILED AGGREGATION" ID="Agg.nc" urlPath="Agg.nc">

<serviceName>allServices</serviceName>

<netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";>

<aggregation dimName="lon" type="tiled">
<netcdf location="file:/media/HIST_DATA/SEAWIFS_MONTHLY_9km_BB/monthly_E.nc" />
<netcdf location="file:/media/HIST_DATA/SEAWIFS_MONTHLY_9km_BB/monthly_Wx.nc" /> 

</aggregation>

</netcdf>

</dataset>





Yolanda Sagarminaga Investigador Principal Principal Investigator
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