Re: [idvdevelopers] Idv netcdf problem

• To: Tom Whittaker <whittaker@xxxxxxxx>
• Subject: Re: [idvdevelopers] Idv netcdf problem
• From: Sachin Kumar Bhate <skbhate@xxxxxxxxxxxxxxx>
• Date: Tue, 29 Jul 2008 12:04:58 -0400

Maswood,

The best way to open non-CF  file in IDV is to make them CF-compliant
by wrapping them in NcML. There is great tutorial on NcML at..

http://www.unidata.ucar.edu/software/netcdf/ncml/

As far as IDV nuts-n-bolts goes, there is an extensive tutorial by IDV folks
on how to open various files and other usages..

http://www.unidata.ucar.edu/software/idv/docs/userguide/toc.html#index.html

-skb

--
Sachin Kumar Bhate, Research Associate
MSU-High Performance Computing Collaboratory, NGI
John C. Stennis Space Center, MS 39529
http://www.northerngulfinstitute.org/



Tom Whittaker wrote:

Maswood --

In the Data Choosers tab, open the "Data Source Type" list at the top
of the panel and scroll down to "grids".

Looking at your structure, you might need to make a couple of name
changes (although I'm not sure anymore)....like "t" might need to be
renamed "time" so the IDV recognizes that as time.   I"m not sure
about "z", but normally we use "altitude".  Also your "y" and "x"
should be renamed "lat" and "lon", and you probably need to add a
"coordinate" attribute for the grids.

Have a look at section 5.2 of the CF conventions:
<http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.3/ch05s02.html>

tom

On Tue, Jul 29, 2008 at 10:19 AM, Maswood Hasan Mostafi
<mostafi@xxxxxxxxx> wrote:

Hi Tom,

Thanks for the quick reply. It seems the convention is CF but still causes
problem.

How to select "grids (netcdf, ...)". Which menu bar ?

I have attached a header dump of a file. Original file size is 170 MB , so
could not attach that.

 Thanks again for the help.

Maswood

======================================================
netcdf C:\MamVisAD\EnviroData\Bathymetry\2\2 {
dimensions:
    t = 577 ;
    z = 1 ;
    y = 321 ;
    x = 241 ;
variables:
    float t(t) ;
        t:long_name = "time" ;
        t:units = "days since 1984-1-1 00:00:00" ;
    float z(z) ;
        z:long_name = "depth" ;
        z:units = "m" ;
    float y(y) ;
        y:long_name = "latitude" ;
        y:units = "degrees_north" ;
    float x(x) ;
        x:long_name = "longitude" ;
        x:units = "degrees_east" ;
    float eastward_sea_water_velocity(t, z, y, x) ;
        eastward_sea_water_velocity:long_name =
"eastward_sea_water_velocity" ;
        eastward_sea_water_velocity:standard_name =
"eastward_sea_water_velocity" ;
        eastward_sea_water_velocity:units = "m/s" ;
        eastward_sea_water_velocity:_FillValue = 1.#QNAN00f ;
        eastward_sea_water_velocity:add_offset = 0.f ;
        eastward_sea_water_velocity:scale_factor = 1.f ;

// global attributes:
        :Conventions = "CF-1.0" ;
        :title = "MERSEA_NATL_ANAL" ;
}
=================================================================



On Mon, Jul 28, 2008 at 10:58 AM, Tom Whittaker <whittaker@xxxxxxxx> wrote:

Generally, NetCDF files that are CF compliant will open and display
without difficulty.  Be sure to select the correct "type" (for
example, "grids (netcdf, ...)".  If that does not help, please send
along at least a header dump (ncdump -h) of the file -- or post the
file where we can have a look at it.

tom

On Mon, Jul 28, 2008 at 8:35 AM, Maswood Hasan Mostafi
<mostafi@xxxxxxxxx> wrote:

Hi,

I have problems of viewing netCDF file using IDV. Just trying to open
the
file using the software
is not working.Is there any particular way to open netCDF file using IDV
?

Thanks

Maswood
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--
Tom Whittaker
University of Wisconsin-Madison
Space Science & Engineering Center (SSEC)
Cooperative Institute for Meteorological Satellite Studies (CIMSS)
1225 W. Dayton Street
Madison, WI 53706 USA
ph: +1 608 262 2759

• References:
  • [idvdevelopers] Idv netcdf problem
    • From: Maswood Hasan Mostafi
  • Re: [idvdevelopers] Idv netcdf problem
    • From: Tom Whittaker
  • Re: [idvdevelopers] Idv netcdf problem
    • From: Maswood Hasan Mostafi
  • Re: [idvdevelopers] Idv netcdf problem
    • From: Tom Whittaker