Roy,
i converted a GMT grid (small.grd for example) to a .cdf file as
explained in the GMT documentation using a script which uses the grdinfo
and grd2xyz commands from the gmt library. i now have small.grd,
small.cdl, and small.cdf
i was looking through the code and ncdump does work.. actually when i
do a :
ncdump -h small.cdf i got the results
small
{
}
..there is not header numbers for the rows, columns, latitude/longitude.
i tried an ncdump on a netCDF file that i knew was in the right format
and i get something like this..
file {
rows: 300
columns: 100
etc etc
}
all the (x,y,z) coordinates
i have looked deeper into the two files to see whats going on.
typing the command at the prompt: od -c small.cdl | more, i look at the
first line of the header and i see a \r \n (carriage return & a line
feed) ..???
i do the same for a .cdf file that i know that works and there is only a
\n (line feed) on the first line. so this is what i do. i take the
small.cdl file from above and at the prompt type dos2unix small.cdl...
and guess what, the carriage return is gone and i successfully am able to
convert it to a .cdf file(using ncgen utility) and thus i can run the
data and get the visualization that i need. The \r i am seeing is a dos/windows
thing and not a unix, which explains my dos2unix solution.
I am on a linux box, which explains why i didnt get any output before on
the ncdump since the \r is dos/windows. i know this is a lot, but these
are the initial results and findings if you could email me back. it is
not 2:45 pm central time and will not be back until Tuesday 13th, so if
you respond after 4:30 central time you will know why i dont respond
until then. i hope this helps more.....
Chad
On Thu, 8 May 2003, Roy
Mendelssohn wrote:
> Hi Chad:
>
> GMT does do netCDF but it follows a specific convention. What
> visualization program are you trying to read it in? Even more
> importantly, for the GMT netcdf file, can you do the following
> command (assuming you have the utility and the file is foo.nc):
>
> ncdump -h foo.nc
>
> and send the results. The problem usually resides with the
> dimensioning of the variables.
>
> -Roy M.
>
>
> At 1:29 PM -0500 5/8/03, Mr. Chad W. Saxon wrote:
> >i'm sorry if i was unclear before.. i am using netCDF. The GMT file is
> >for the most part the same as the netCDF file but there is one or two
> >slight variations. this is the problem i am having when figuring out how
> >my program can read both formats.
> >
> >chad
> >
> >On Thu, 8 May 2003, John Caron wrote:
> >
> >> Mr. Chad W. Saxon wrote:
> >>
> >> >hi there everyone. i am new to the list and have an interesting question
> >> >regarding netCDF. I have two data formats, one in GMT and one in CDF. i
> >> >have a computer program that uses CDF as a way to read data and
> >> >visualize it, however the program does not read the GMT format. Is there
> >> >a simple script or solution to convert the GMT format to CDF? i was
> >> >thinking there was a GMT command to convert it to CDF format but am
> >> >uncertain as to what that is. I know there is not much difference between
> >> >the two, but its enough to cause my program not to run correctly. i hope
> >> >i have been clear in my problem, and i would appreciate your help. thanks
> >> >a lot.
> >> >
> >> >Chad
> >> >
> >> >
> >> By "CDF" do you mean "netCDF" ?
> >>
> >> A "GMT file" might be a netCDF file already, as far as I can tell from:
> >>
> > > http://gmt.soest.hawaii.edu/gmt/doc/html/GMT_Docs/node108.html
> > >
> > > do you know what you have?
> > >
>
>
> --
> Roy Mendelssohn
> Pacific Fisheries Environmental Laboratory
> 1352 Lighthouse Avenue
> Pacific Grove, CA 93950-2097
>
> e-mail: rmendels@xxxxxxxxxxxxx
> voice: (831)-648-9029
> fax: (831)-648-8440
> www: http://www.pfeg.noaa.gov/
>
> "Old age and treachery will overcome youth and skill."
>
