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Re: [netcdfgroup] Unable to use new ncdump (4.6.2) on opendap URL

There is another problem. The file being sent thru opendap is a netcdf-4 file, not a netcdf-3 (classic) file. Further, the netcdf-4 dataset uses the ubyte data type 
for 'waterb', and ubyte type is not defined for netcdf-3.
Technically,  there is no standard mapping from netcdf-4 to opendap.
I can see following solutions:
1. do nothing; this request is erroneous, or
2. add another hack to support this case, or
3. request that the DAP4 protocol be used since this is a netcdf-4 file being sent. 


On 3/13/2019 3:28 AM, Plieger, Maarten (KNMI) wrote:

Dear NetCDFGroup,

I have a question: A previous version of ncdump (4.4.1.1) does give a nice 
overview of an OpenDAP URL, while a newer version of ncdump (4.6.2) does not:

Version netcdf library version 4.4.1.1 of Apr 10 2018 03:02:27:
$ ncdump -h 
http://opendap.knmi.nl/knmi/thredds/dodsC/CLIPC/tudo/tier3/waterb_arcgis-10-4-0_IRPUD_JRC-LUISA-Landuse_10yr_20100101-20501231.nc

Gives

netcdf waterb_arcgis-10-4-0_IRPUD_JRC-LUISA-Landuse_10yr_20100101-20501231 {
dimensions:
         time = UNLIMITED ; // (5 currently)
         x = 390 ;
         y = 393 ;
variables:
...
}

works, fine while:

netcdf library version 4.6.2 of Dec 17 2018 19:36:03
$ ncdump -h 
http://opendap.knmi.nl/knmi/thredds/dodsC/CLIPC/tudo/tier3/waterb_arcgis-10-4-0_IRPUD_JRC-LUISA-Landuse_10yr_20100101-20501231.nc

Gives

ncdump: 
http://opendap.knmi.nl/knmi/thredds/dodsC/CLIPC/tudo/tier3/waterb_arcgis-10-4-0_IRPUD_JRC-LUISA-Landuse_10yr_20100101-20501231.nc:
 
http://opendap.knmi.nl/knmi/thredds/dodsC/CLIPC/tudo/tier3/waterb_arcgis-10-4-0_IRPUD_JRC-LUISA-Landuse_10yr_20100101-20501231.nc:
 NetCDF: Not a valid data type or _FillValue type mismatch

Am I forgetting something?

Cheers,
Maarten Plieger
KNMI
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