Re: [ferret_users] DODS data reading

To: "Yogesh K. Tiwari" <ktiwari@xxxxxxxxxxxxxxx>
Subject: Re: [ferret_users] DODS data reading
From: Peter Cornillon <pcornillon@xxxxxxxxxxx>
Date: Fri, 2 Sep 2005 16:16:35 -0400
Cc: ferret_users <ferret_users@xxxxxxxx>
In-reply-to: <431863F2.5080204@bgc-jena.mpg.de>
References: <4311BCEF.5060407@bgc-jena.mpg.de> <431345E0.5040706@noaa.gov> <e2d9f4d4c297273ebf24cfabee6efea1@gso.uri.edu> <431434A7.5080602@bgc-jena.mpg.de> <0033f0c660fb4add45b8c152b36cf9c3@gso.uri.edu> <431863F2.5080204@bgc-jena.mpg.de>
Sender: owner-ferret_users@xxxxxxxxxxxxx

On Sep 2, 2005, at 10:38 AM, 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') :-

No, you should not use .ascii in Ferret. You should use the name without .ascii. Again, appending .ascii tells the server to pass the output through a program that turns the returned data in an ascii data stream. Ferret is not expecting an ascii data stream. I will try to find out what the problem is and get back to you. Sorry for the problem on this one.

Peter

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
===========================================

--
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

References:
- [ferret_users] DODS data reading
  - From: Yogesh K. Tiwari
- Re: [ferret_users] DODS data reading
  - From: Ansley Manke
- Re: [ferret_users] DODS data reading
  - From: Peter Cornillon
- Re: [ferret_users] DODS data reading
  - From: Yogesh K. Tiwari
- Re: [ferret_users] DODS data reading
  - From: Peter Cornillon
- Re: [ferret_users] DODS data reading
  - From: Yogesh K. Tiwari

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