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[THREDDS #ZWT-786400]: Unable to open subsetted NetCDF files

Greetings,

I just tried to pull the data you described from that THREDDS server and I was 
able to plot accumulated precipitation in GrADS without issue.  I'm using 
version 2.2.1 that comes in apt on Ubuntu 22.04, and I tried to recreate your 
settings as best I could, as well as a few others just to see if I could break 
it.  Anything I tried seemed to work; see below for my GrADS output.  And while 
I'm not including them here, I was able to visualize that data as well.

What version of GrADS are you using?  Did you compile this from source or did 
you install it from a package manager like apt?

Would you be able to send me a full URL to a data set that breaks for you so I 
can try the same thing on my end?


My GrADS output:

Grid Analysis and Display System (GrADS) Version 2.2.1
Copyright (C) 1988-2018 by George Mason University
GrADS comes with ABSOLUTELY NO WARRANTY
See file COPYRIGHT for more information

Config: v2.2.1 little-endian readline grib2 netcdf hdf4-sds hdf5 
opendap-grids,stn geotiff shapefile
Issue 'q config' and 'q gxconfig' commands for more detailed configuration 
information
GX Package Initialization: Size = 11 8.5 
Running in Batch mode
ga-> sdfopen GFS_Global_0p25deg_20230220_1800.grib2.nc4 
Scanning self-describing file:  GFS_Global_0p25deg_20230220_1800.grib2.nc4
SDF file GFS_Global_0p25deg_20230220_1800.grib2.nc4 is open as file 1
LON set to 105 160 
LAT set to -47 -8 
LEV set to 0 0 
Time values set: 2023:2:20:19 2023:2:20:19 
E set to 1 1 

ga-> q file
File 1 : 
  Descriptor: GFS_Global_0p25deg_20230220_1800.grib2.nc4
  Binary: GFS_Global_0p25deg_20230220_1800.grib2.nc4
  Type = Gridded
  Xsize = 221  Ysize = 157  Zsize = 1  Tsize = 46  Esize = 1
  Number of Variables = 1
     total_precipita  0  t,y,x  Total precipitation (Mixed_intervals 
Accumulation) @ Ground or water surface

ga-> q config
Config: v2.2.1 little-endian readline grib2 netcdf hdf4-sds hdf5 
opendap-grids,stn geotiff shapefile
Grid Analysis and Display System (GrADS) Version 2.2.1
Copyright (C) 1988-2018 by George Mason University 
GrADS comes with ABSOLUTELY NO WARRANTY 
See file COPYRIGHT for more information 

This build of GrADS has the following features:
 -+- Byte order is LITTLE ENDIAN 
 -+- Athena Widget GUI DISABLED 
 -+- Command line editing ENABLED 
 -+- GRIB2 interface ENABLED  g2clib-1.6.3 
 -+- NetCDF interface ENABLED  netcdf-4.8.1 
 -+- OPeNDAP gridded data interface ENABLED
 -+- OPeNDAP station data interface ENABLED  libgadap 2.0 
 -+- HDF4 interface ENABLED  hdf-4.2r15 
 -+- HDF5 interface ENABLED  hdf5-1.10.7 
 -+- KML contour output ENABLED
 -+- GeoTIFF and KML/TIFF output ENABLED
 -+- Shapefile interface ENABLED


Best,
-Mike


> Hi,
> 
> Whenever I try to download subsetted NetCDF files from your NetCDF Subset
> Service for Grids webpage  (e.g.
> https://thredds-jumbo.unidata.ucar.edu/thredds/ncss/grid/grib/NCEP/GFS/Global_0p25deg/GFS_Global_0p25deg_20230220_1800.grib2/dataset.html
> ) and open it in GrADS, it always produces the following type of error:
> 
> 
> 
> 
> 
> *ga-> sdfopen GFS_Global_0p25deg_20230220_1800.grib2.nc
> <http://GFS_Global_0p25deg_20230220_1800.grib2.nc>Scanning self-describing
> file:  GFS_Global_0p25deg_20230220_1800.grib2.nc
> <http://GFS_Global_0p25deg_20230220_1800.grib2.nc>Error: nc_open failed to
> open file GFS_Global_0p25deg_20230220_1800.grib2.nc
> <http://GFS_Global_0p25deg_20230220_1800.grib2.nc>No such file or
> directorygadsdf: Couldn't ingest SDF metadata.*
> 
> This happens regardless of what combination of output format (netcdf3
> and netcfd4-classic) and CF compliance settings I use.
> 
> But for some strange reason, I can still open and plot the data in an
> application like Panoply.
> 
> Below is a screenshot of how I had the subsetting and output options set up
> during one of my attempts at downloading a file with accumulated
> precipitation for the Australian area:
> 
> [image: image.png]
> I'm just wondering why it's not working?
> 

Ticket Details
===================
Ticket ID: ZWT-786400
Department: Support THREDDS
Priority: Normal
Status: Open
===================
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