Re: HDF Data reading and plotting using NCL....

[1]
The HDF file is, as you note, not COARDS conformant.
The geolocation variable contains both latitude
and longitude. These should be separate varables
with COARDS conforming units [eg, degrees_north
and degrees_east]. In fact, the hdf4sds_6 example at
    http://www.ncl.ucar.edu/Applications/HDF.shtml
explicitly extracts and create lat & lon arrays with
COARDS conforming units.

[2]
If you want to use GrADS, please write to the GrADS users
forum. Maybe someone there can help you.

[3]
You mention MODIS, TRMM, ... I speculate you will encounter
many issues if you want to use GrADS.

Good luck

On 7/20/10 5:51 AM, jayakrishnan pr wrote:
> Dear Sir,
> Thank you very much for your reply. I am pretty new to
> NCL. Just understanding the basics. I want to plot all the details of
> HDF datas which are MODIS, TRMM etc. I plotted using the ncl example
> given by you. But I am not able to change the program as it creates
> errors as I am very new to ncl. I am quite familiar with Grads. But
> grads cannot read the HDF files which NCL can read. Also grads can read
> only those HDF files which agrees COARDS convention. If I change HDF
> into nc file then also I cannot open using Grads as it is not agreeing
> COARDS convention. So my question is that can I convert the HDF file
> which is not agreeing COARDS convention into nc file or HDF file which
> follows COARDS convention so that I can plot directly it in GRADS.
> Looking foreward........
>
> --
> Jayakrishnan.P.R.
> CSIR-Research Fellow
> Department of Atmospheric Sciences,
> Cochin University of Science and Technology (CUSAT)
> Cochin-682016, mob:09895417565
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Received on Tue Jul 20 06:22:32 2010