Roy-
Basically, you want to use the url (including any opendap constraints)
as the path argument to nc_open(). As with any other dataset, you then
need to read the actual data using e.g. nc_vara().
The tricky part is this: in order to see what the metadata is (dimensions
variables, etc), you probably
should use ncdump -h "url+constraint" to see what what the library did
when it translated the dap model to the netcdf-3 model.
One you have that metadata, you can just write your program using that
information.
=Dennis Heimbigner
Unidata
p.s. we probably should put some documentation about this.
Roy Mendelssohn - NOAA Federal wrote:
Hi All:
I am still a little confused on how to use opendap from within the netcdf library, The
online documentation says I put the URL, including the constraint, into the "open
file" command ( which will differ by language). So since I am including the
constraint into the URL of the open command, is that, and the data is transferred, or is
is viewed as a virtual datasets and I need to do the usual reads to extract the data? If
the latter, is the size (and therefore the relative indexing) based on the virtual
dataset or the actual one?
I looked in the library examples for a program that did this and didn't find
it, if there is a test program in there somewhere you can point me to it would
be much appreciated.
-Roy
**********************
"The contents of this message do not reflect any position of the U.S. Government or
NOAA."
**********************
Roy Mendelssohn
Supervisory Operations Research Analyst
NOAA/NMFS
Environmental Research Division
Southwest Fisheries Science Center
1352 Lighthouse Avenue
Pacific Grove, CA 93950-2097
e-mail: Roy.Mendelssohn@xxxxxxxx (Note new e-mail address)
voice: (831)-648-9029
fax: (831)-648-8440
www: http://www.pfeg.noaa.gov/
"Old age and treachery will overcome youth and skill."
"From those who have been given much, much will be expected"
"the arc of the moral universe is long, but it bends toward justice" -MLK Jr.
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