[thredds] ncml aggregation error when using stride greater than 1

• To: thredds@xxxxxxxxxxxxxxxx
• Subject: [thredds] ncml aggregation error when using stride greater than 1
• From: Upendra Dadi <Upendra.Dadi@xxxxxxxx>
• Date: Tue, 28 Sep 2010 10:48:21 -0400

Hi,

------------------------------------------------------------------------------------------------
......
<aggregation dimName="time" type="joinExisting">
......
<netcdf id="357" location ="http://www.foo.com/file1.nc.gz"; ncoords="2"/>
<netcdf id="358" location ="http://www.foo.com/file2.nc.gz"; ncoords="2"/>
<netcdf id="359" location ="http://www.foo.com/file3.nc.gz"; ncoords="2"/>
<netcdf id="360" location ="http://www.foo.com/file4.nc.gz"; ncoords="2"/>
<netcdf id="361" location ="http://www.foo.com/file5.nc.gz"; ncoords="2"/>
<netcdf id="362" location ="http://www.foo.com/file6.nc.gz"; ncoords="2"/>
.......

--------------------------------------------------------------------------------------------------------------------------------------------

Each of the netcdf files in the location attribute has the dds like this:

----------------------------------------------------------------------------------------------
Dataset {

   Grid {
     Array:
       Int16 sea_surface_temperature[time = 2][lat = 720][lon = 1440];
     Maps:
       Int32 time[time = 2];
       Float32 lat[lat = 720];
       Float32 lon[lon = 1440];
   } sea_surface_temperature;
   Grid {
     Array:
       Int16 sst_dtime[time = 2][lat = 720][lon = 1440];
     Maps:
       Int32 time[time = 2];
       Float32 lat[lat = 720];
       Float32 lon[lon = 1440];
  }
   } sst_dtime;
}file1.nc.gz;
--------------------------------------------------------------------------

Now, the problem is when I am issuing an ncml request for the variable 
sst_dtime with a stride of 1 or 2 over time variable(e.g. time: 0:1:100 or 
time: 0:2:100), it is working fine.
But when I issue a query with a stride of greater than 2(note that each netcdf 
layer has a time dimension of size 2(ncoords))(e.g. time: 0:3:100), I get the 
following error:

Error {
   code = 500;

};

Upendra