[gradsusr] Help with HDF-EOS2

[Huddleston, John]

Hernan

Your files mix both North Polar and South Polar into one file; so you will have to create two separate GrADS control files for each.

I'm no expert on the AMSR datasets; however, here is a start of a NPS control file. You will have to fix the lonref (-97), starting lower X (190), and starting lower Y (15).


dset AMSR_E_L3_SeaIce25km_V12_20061201.hdf
dtype hdfsds
title Sea ICE
pdef 304 448 nps 150 234 -97 25000
undef -999
xdef 304 linear 190 0.25
ydef 448 linear 15 0.25
zdef 1 levels 1000.0
tdef 1  linear 00:00Z01dec2006 1dy
vars 3
SI_25km_NH_ICECON_ASC=>nhasc 1 y,x NH_ICECON_ASC
SI_25km_NH_ICECON_DSC=>nhdsc 1 y,x NH_ICECON_DSC
SI_25km_NH_ICECON_DAY=>nhday 1 y,x NH_ICECON_DAY
Endvars


John Huddleston

From: gradsusr-bounces at gradsusr.org [mailto:gradsusr-bounces at gradsusr.org] On Behalf Of hersala
Sent: Thursday, October 06, 2011 4:08 AM
To: GrADS Users Forum
Subject: Re: [gradsusr] Help with HDF-EOS2

Dear Charles and Arlindo:
Thank you very much for you answers. I will try with your suggestions.
Hernán

On 5 October 2011 18:06, Arlindo da Silva <dasilva at alum.mit.edu<mailto:dasilva at alum.mit.edu>> wrote:
On Wed, Oct 5, 2011 at 4:52 PM, Charles Seman <Charles.Seman at noaa.gov<mailto:Charles.Seman at noaa.gov>> wrote:
Hernan,

Do you have access to NCL?  If so, there is an "ncl_convert2nc"
command-line utility which lists "HDF-EOS 2" as one of the input dataset
formats it recognizes:
http://www.ncl.ucar.edu/Document/Tools/ncl_convert2nc.shtml
I haven't used it.  Example 6 on the above web site features an HDF file
for input.

I don't think the issue is the format per se (HDF-4 vs NetCDF), but rather that HDF-EOS uses a metadata convention that is not COARDS; if you ignore the HDF-EOS junk (usually in the form of global attributes), it is a bonafide HDF-4 file. With the right DDF you should be able to read this Level 3 dataset (likely on 1x1 lat lon grid), no need to convert it to netcdf.   If you have hdf-4 installed, send the result of "ncdump -c filename" where "ncdump" here is the one that comes with HDF-4.

   Arlindo


Hope this helps,
Chuck

hersala wrote:
> Dear GrADS users:
>
> I would need some help in extracting a single dataset from an HDF-EOS2
> file (for instance, ICECON from AMSR_E_L3_SeaIce12km_B06_20080207.hdf)
> that could be opened with GrADS.
>
> I have already tried in several ways, but to no avail.
>
> Thanks in advance.
>
> Hernán
>
>
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--

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email address, not cjs at gfdl.noaa.gov<mailto:cjs at gfdl.noaa.gov>.

********************************************************************
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 Geophysical Fluid Dynamics Laboratory         voice: (609) 452-6547<tel:%28609%29%20452-6547>
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Arlindo da Silva
dasilva at alum.mit.edu<mailto:dasilva at alum.mit.edu>

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