Re: [ferret_users] DODS data reading

["Yogesh K. Tiwari" <ktiwari@xxxxxxxxxxxxxxx>]

Hello Peter,

Sorry for late reply on this matter.

After yours mail I tried the link in the
browser then it shows something and not the
error.

BUT

if we try to read yours suggested url in
ferret (with '.ascii') :-
>

>yes? Set data
"http://g0dug03u.ecs.nasa.gov/dods-bin/nph-dods/datapool/MOAA/

MYD08_M3.004/2003.05.01/MYD08_M3.A2003121.004.2004136064318.hdf.ascii?
Optical_Depth_Land_And_Ocean_Mean_Mean[0:1:179][0:1:359]"


 Then the problem is from ferret, something
like :-

!++++++++++++++++++++++++++++++
 *** NOTE: Internal err: unknown data type
 *** NOTE: attribute must be a string:
"units" in netCDF variable:
 *** NOTE: too many values in attribute
"scale_factor" in netCDF file variable:
 *** NOTE: too many values in attribute
"add_offset" in netCDF file variable:
 *** NOTE: too many values in attribute
"missing_value" in netCDF file variable:
 *** NOTE: too many values in attribute
"_FillValue" in netCDF file variable:
 *** NOTE: attribute must be a string:
"axis_order" in netCDF variable:
 *** NOTE: attribute must be a string:
"parent_grid" in netCDF variable:
 *** NOTE: attribute must be a string:
"edges" in netCDF variable:
 *** NOTE: attribute must be a string:
"child_axis" in netCDF variable:
 *** NOTE: Internal err: unknown data type
 *** NOTE: Unsupported netCDF # of axes for
variable
 *** NOTE: attribute must be a string:
"edges" in netCDF variable:
 *** NOTE: attribute must be a string:
"child_axis" in netCDF variable:
 *** NOTE: Internal err: unknown data type

.....................
..............
!++++++++++++++++++++++++

I think ferret dosent like the variables
defined in the DODS data.

Can any body help on this ?

Many thanks,
Yogesh


Peter Cornillon wrote:
> 
> Strange, the URL that I am using worked in both Safari and 
> Internet-Explorer on my Mac. Here is the URL that I am using:
> 
> http://g0dug03u.ecs.nasa.gov/dods-bin/nph-dods/datapool/MOAA/
> MYD08_M3.004/2003.05.01/MYD08_M3.A2003121.004.2004136064318.hdf.ascii?
> Optical_Depth_Land_And_Ocean_Mean_Mean[0:1:179][0:1:359]
> 
> Did you remember to append the .ascii after the file name and before 
> the constraint? When I used the above URL without the .ascii I got an 
> error similar to what you got. Browsers do not know how to handle the 
> OPeNDAP data stream. The .ascii tells the server to convert the OPeNDAP 
> data stream to an ASCII data stream.
> 
> Peter
> 
>>
>> !+++++++++++++++++
>>
>> Error {
>>     code = 0;
>>     message = "This DODS server does not know how to serve the
>> dataset  `/datapool/MOAA/MYD08_M3.004/2003.05.01/
>> MYD08_M3.A2003121.004.2004136064318.'
>> It maybe that the server has not been configured for this type of 
>> dataset.
>> Please double check the URL for errors and, if you think that the URL  is
>> correct, please contact the  DODS user support coordinator at: 
>> support@unidata.ucar.edu";
>> };
>>
>> !+++++++++++++++++++
>>
>> I am looking forward the help from the persons to whome Peter 
>> mentioned as well as if any other DODS data expert could jump in this 
>> for the help.
>>
>> Thanks in advance to all,
>>
>> Regards,
>> Yogesh
>>
>>
>>  Cornillon wrote:
>>> Hi Yogesh,
>>> There may be something wrong with the way that the OPeNDAP (a.k.a.  
>>> DODS) server is returning the metadata. OPeNDAP returns three data  
>>> types to the requesting client, the data itself and two different  
>>> groups of metadata, the dds which provides information about the  
>>> structure of the data, the data type, dimensions of arrays, etc.
>>> and   the das which provides information about the variables
>>> themselves,  the  units used, the long name if there is one, etc.
>>> From both Matlab  and my  web browser I can access all of these.
>>> However when I try to  access the  data set from the OPeNDAP Data
>>> Connector, a Java based  program designed  to read and display
>>> OPeNDAP accessible data, I get  an error when it  tries to access the
>>> das. My guess is that the  problem is that what is  being returned
>>> doesn't conform exactly to  the OPeNDAP data access  protocol, but
>>> that it is very close and that  Matlab and my browser are  ignoring
>>> the slight inconsistency. I have  copied James Gallagher on  this
>>> message. He is the technical lead for  OPeNDAP and should be able  to
>>> give a more definitive answer.
>>> Peter
>>> On Aug 29, 2005, at 1:29 PM, Ansley Manke wrote:
>>>> HI Yogesh,
>>>> It looks like this may be due to a problem with the way the DODS  
>>>> server is configured. I opened the links you show in my browser
>>>> and   get this message.
>>>>
>>>> "http://g0dug03u.ecs.nasa.gov/dods-bin/nph-dods/datapool/MOAA/ 
>>>> MYD08_M3.004/2003.05.01/MYD08_M3.A2003121.004.2004136064318.hdf? 
>>>> Optical_Depth_Land_And_Ocean_Mean_Mean[0:1:179][0:1:359]"
>>>>
>>>> Error {
>>>>    code = 0;
>>>>    message = "This DODS server does not know how to serve the 
>>>> dataset  
>>>> `/datapool/MOAA/MYD08_M3.004/2003.05.01/MYD08_M3.A2003121.004.'
>>>> It maybe that the server has not been configured for this type of  
>>>> dataset.
>>>> Please double check the URL for errors and, if you think that the 
>>>> URL  is
>>>> correct, please contact the  DODS user support coordinator at:  
>>>> support@unidata.ucar.edu";
>>>> };
>>>>
>>>>
>>>> (DODS experts please jump in if there's more to this.)
>>>>
>>>> Ansley
>>>>
>>>> Yogesh K. Tiwari wrote:
>>>>
>>>>> Hello Ferret Users,
>>>>>
>>>>> I am using ferret v5.80 in suse linux.
>>>>>
>>>>> First time I am using DODS data server.
>>>>>
>>>>> I tried to open the MODIS/AQUA-atmosphere (Level3, monthly
>>>>> grided))   aerosol optical depth data kept at the DODS server(after
>>>>> taking  the  url from the server) :-
>>>>>
>>>>> !++++++++++++
>>>>> yes? use  
>>>>> "http://g0dug03u.ecs.nasa.gov/dods-bin/nph-dods/datapool/MOAA/ 
>>>>> MYD08_M3.004/2003.05.01/MYD08_M3.A2003121.004.2004136064318
>>>>> .hdf?Optical_Depth_Land_And_Ocean_Mean_Mean[0:1:179][0:1:359]"
>>>>>
>>>>> yes? show data
>>>>>      currently SET data sets:
>>>>>     1>  
>>>>> http://g0dug03u.ecs.nasa.gov/dods-bin/nph-dods/datapool/MOAA/ 
>>>>> MYD08_M3.004/2003.05.01/MYD08_M3.A2003121.004.2004136064318.hd
>>>>> f?Optical_Depth_Land_And_Ocean_Mean_Mean[0:1:179][0:1:359]   (default)
>>>>>  name     title I         J         K         L
>>>>>
>>>>> yes?
>>>>>
>>>>> !+++++++++++++
>>>>>
>>>>> show data in ferret , dosent show any variable.
>>>>>
>>>>> What I am doing wrong ?
>>>>>
>>>>> Should I use another ferret version, other thans v5.8, as Ansley  
>>>>> mentioned recently ?
>>>>>
>>>>> Pls help.
>>>>>
>>>>> Many thanks,
>>>>>
>>>>> Regards,
>>>>> Yogesh
>>>>>
>>>>>
>>>>>
>>> -- 
>>>  Peter Cornillon
>>>    Graduate School of Oceanography     -  Telephone: (401) 874-6283
>>>       University of Rhode Island                 -              
>>> Fax:   (401) 874-6728
>>>         Narragansett, RI 02882                    -          
>>> E-mail:   pcornillon@gso.uri.edu
>>
>>
>> -- 
>>
>> ===========================================
>> Yogesh Tiwari,
>> Max-Planck Institute for Biogeochemistry,
>> Hans-Knoell Strasse 10,
>> D-07745 Jena,
>> Germany
>>
>> Office   : 0049 3641 576 376
>> Home     : 0049 3641 223 163
>> Fax      : 0049 3641 577 300
>> Cell     : 0049 1520 4591 008
>> e-mail   : yogesh.tiwari@bgc-jena.mpg.de
>> ===========================================
>>
>>
> -- 
>  Peter Cornillon
>    Graduate School of Oceanography     -  Telephone: (401) 874-6283
>       University of Rhode Island                 -               Fax: 
> (401) 874-6728
>         Narragansett, RI 02882                    -           E-mail: 
> pcornillon@gso.uri.edu
> 
> 
> 


-- 

===========================================
Yogesh Tiwari,
Max-Planck Institute for Biogeochemistry,
Hans-Knoell Strasse 10,
D-07745 Jena,
Germany

Office   : 0049 3641 576 376
Home     : 0049 3641 223 163
Fax      : 0049 3641 577 300
Cell     : 0049 1520 4591 008
e-mail   : yogesh.tiwari@bgc-jena.mpg.de
===========================================