Dennis,
You probably should try:
http://www.esrl.noaa.gov/psd/thredds/dodsC/Datasets/ncep.reanalysis.dailyavgs/pressure/air.1948.nc.html
Which will let you access the dataset through browser.
Wei
huangwei@xxxxxxxx
VETS/CISL
National Center for Atmospheric Research
P.O. Box 3000 (1850 Table Mesa Dr.)
Boulder, CO 80307-3000 USA
(303) 497-8924
On Mar 8, 2012, at 2:50 PM, Dennis Heimbigner wrote:
> Well it should not seg fault.
> When I plugged this
> > http://www.esrl.noaa.gov/psd/thredds/dodsC/Datasets/ncep.reanalysis.dailyavgs/pressure/air.1948.nc?air
> into my browser, I got the following error:
>> Error {
>> code = 403;
>> message = "Request too big=130.0 Mbytes, max=50.0";
>> };
>
> =Dennis Heimbigner
> Unidata
>
>
> Wei Huang wrote:
>> NetCDF group,
>> Recently we are testing opendap with NetCDF.
>> Our code give segmentation vault, and we trace back this to NetCDF opendap.
>> The link we tried is:
>> http://www.esrl.noaa.gov/psd/thredds/dodsC/Datasets/ncep.reanalysis.dailyavgs/pressure/air.1948.nc
>> We tried "ncdump -h …", which worked fine, but "ncdump -v air …" gave
>> segmentation fault.
>> We tried a simple c code, below, which give segmentation fault as well.
>> Has anyone seen this before?
>> Thanks,
>> Wei
>> ---------
>> C - code:
>> #include <stdio.h>
>> #include <stdlib.h>
>> #include <netcdf.h>
>> int main(int *argc, char **argv)
>> {
>> char flnm[] =
>> "http://www.esrl.noaa.gov/psd/thredds/dodsC/Datasets/ncep.reanalysis.dailyavgs/pressure/air.1948.nc";;
>> int status; /* error status */
>> int ncid; /* netCDF ID */
>> int varid; /* variable ID */
>> static size_t start[16];
>> static size_t count[16];
>> short *vals;
>> nc_type type; /* variable type */
>> int ndims; /* number of dims */
>> int dimids[NC_MAX_VAR_DIMS]; /* dimension IDs */
>> int natts; /* number of attributes */
>> int nvars, ngatts, unlimdimid;
>> size_t length, recs;
>> char recname[NC_MAX_NAME+1];
>> int n;
>> status = nc_open(flnm, NC_NOWRITE, &ncid);
>> /*
>> *if (status != NC_NOERR) handle_error(status);
>> */
>> fprintf(stderr, "ncid = %d\n", ncid);
>> status = nc_inq(ncid, &ndims, &nvars, &ngatts, &unlimdimid);
>> status = nc_inq_varid(ncid, "air", &varid);
>> fprintf(stderr, "varid = %d\n", varid);
>> status = nc_inq_var(ncid, varid, 0, &type, &ndims, dimids,
>> &natts);
>> length = 1;
>> for(n = 0; n < ndims; ++n)
>> {
>> status = nc_inq_dim(ncid, dimids[n], recname, &count[n]);
>> fprintf(stderr, "dim %d: id = %d, name: <%s>, length = %ld\n",
>> n, dimids[n], recname, (long) count[n]);
>> length *= count[n];
>> start[n] = 0;
>> }
>> fprintf(stderr, "length = %ld\n", (long) length);
>> vals = (short *) malloc(length * sizeof(short));
>> /*read values*/
>> status = nc_get_vara(ncid, varid, start, count, vals);
>> fprintf(stderr, "vals[0] = %d\n", vals[0]);
>> free(vals);
>> return ( 0 );
>> }
>> Error message:
>> ncid = 65536
>> varid = 4
>> dim 0: id = 0, name: <time>, length = 366
>> dim 1: id = 2, name: <level>, length = 17
>> dim 2: id = 1, name: <lat>, length = 73
>> dim 3: id = 3, name: <lon>, length = 144
>> length = 65405664
>> Program received signal EXC_BAD_ACCESS, Could not access memory.
>> Reason: KERN_INVALID_ADDRESS at address: 0x0000000000000008
>> 0x000000010003163c in buildcachenode34 (nccomm=0x100f15c00,
>> constraint=0x102602650, varlist=0x102602490, cachep=0x7fff5fbfb148,
>> isprefetch=0) at cache.c:231
>> 231 cache->cachesize -= node->xdrsize;
>> (gdb) where
>> #0 0x000000010003163c in buildcachenode34 (nccomm=0x100f15c00,
>> constraint=0x102602650, varlist=0x102602490, cachep=0x7fff5fbfb148,
>> isprefetch=0) at cache.c:231
>> #1 0x0000000100046998 in nc3d_getvarx (ncid=65536, varid=4,
>> startp=0x1004679e0, countp=0x100467960, stridep=0x10048b2a0,
>> data=0x104000000, dsttype0=3) at getvara3.c:192
>> #2 0x000000010004a9fb in NCD3_get_vara (ncid=65536, varid=4,
>> start=0x1004679e0, edges=0x100467960, value=0x104000000, memtype=3) at
>> ncd3dispatch.c:203
>> #3 0x0000000100008b90 in NC_get_vara (ncid=65536, varid=4,
>> start=0x1004679e0, edges=0x100467960, value=0x104000000, memtype=3) at
>> var.c:172
>> #4 0x000000010000a7df in nc_get_vara (ncid=65536, varid=4,
>> start=0x1004679e0, edges=0x100467960, value=0x104000000) at var.c:939
>> #5 0x0000000100001ab2 in main ()
>> huangwei@xxxxxxxx
>> VETS/CISL
>> National Center for Atmospheric Research
>> P.O. Box 3000 (1850 Table Mesa Dr.)
>> Boulder, CO 80307-3000 USA
>> (303) 497-8924
>> ------------------------------------------------------------------------
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