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Re: [ferret_users] DODS data reading



Hi Yogesh,
I think Peter was just reporting that by appending the .ascii  he can see the information about the file using a browser. It does not help Ferret to read the file. There is some incompatibility which Peter talked about in his earlier message.

Ansley


Yogesh K. Tiwari wrote:
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



    


  

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