[gradsusr] question on reading remote data through opendap

[Shen, Suhung (GSFC-610.2)[GEORGE MASON UNIVERSITY]]

Hi,
I am able to read a single file in opendap with sdfopen. For example:
Sdfopen http://disc2.nascom.nasa.gov/opendap/ncml/TRMM_L3/TRMM_3B42/1998/003/3B42.19980103.03.7.HDF.Z.ncml

Then, I tried to read multiple data files with xdfopen to open the following control file, but it does not work. 

dset http://disc2.nascom.nasa.gov/opendap/ncml/TRMM_L3/TRMM_3B42/1998/003/3B42.%y4%m2%d2.03.7.HDF.Z.ncml
OPTIONS template
title "TRMM data"
tdef time 8 linear  03Jan1998 1hr

I got the error message:
ga-> xdfopen trmm_opendap
Scanning Descriptor File:  trmm_opendap
gadsdf: Time dimension time is not an SDF dimension.
SDF Descriptor file trmm_opendap.ctl was not successfully opened & parsed.

GrADS is looking for time dimension variable. However, the data files do not contain a time dimension variable.  

Any idea ??

Thanks,
-suhung 





----------------------------------------------------------------
Suhung Shen, Ph.D
Goddard Earth Sciences Data and Information Services Center
NASA/GSFC  Code 610.2 
Greenbelt MD 20771 

Suhung.Shen at nasa.gov
(301) 614-5088    (301) 614-5268 (fax)
http://disc.gsfc.nasa.gov