Dear Stuart,
Here you have a demo how to access a DAP2 endpoint at ESGF node:
https://asciinema.org/a/0tn1h4jw4921zyydabtv6hhwd
You will need your own OpenID [1] and DAPURL.
More details and use cases at:
https://meteo.unican.es/trac/wiki/ESGFGetCredentials
Also you can use the nccopy withthe openadp url where you can specify
the query to extract only the intereste point/points in the index space
(not coordinate value space)
Please just ask.
Regards
Antonio S. Cofiño
[1] For login and registration at ESGF and CMIP5 data you can use
https://www.earthsystemcog.org/projects/cog/doc/esgf/faq/login
On 25/01/18 15:54, Nathan Potter wrote:
Hi Stuart,
Unfortunately I do not have access credentials for any of the OpenID providers
listed at that site and thus am unable to view that dataset. However from the
URL I can see that the software that is providing access is not Hyrax, but
rather the THREDDS Data Server (TDS), the form interface is roughly the same as
the one the we provide with Hyrax so the documentation link I sent is relevant.
The form utilizes array index based subsetting, not value based subsetting. For your request
you would need to examine the longitude and latitude arrays to determine the indices of the
bounding box you wish to subset. This can be done quickly by selecting one the coordinate
variables (pick for example the variable for latitude) by selecting just that in the form and
then clicking on the “Get ASCII” button. (You may need to do a bit of scripting
to find the indices of the bounds) Repeat for longitude. Once you can express them as
start:stride:stop you can select the variable you wish to retrieve (pH for example) and plug
those index values into the appropriate part of the form. Using the form you can then
retrieve the results as either an ASCII download or as a DAP2 binary object.
The TDS provides several other (possibly more intuitive) ways to request data,
but I am not entirely familiar with them so I am including the TDS support list
so that they can chime in and assist you.
Cheers,
Nathan
On Jan 25, 2018, at 6:35 AM, Tolley, Stuart <st514@xxxxxxxxxxxx> wrote:
Hi Nathan,
This is the URL I am hoping to use:
http://esgf-data1.ceda.ac.uk/thredds/dodsC/cmip5.output1.MOHC.HadGEM2-ES.rcp45.mon.ocnBgchem.Omon.r4i1p1.ph.20120110.aggregation.1
Thank you in advance for any assistance you can provide.
Regards,
Stuart
From: Nathan Potter <ndp@xxxxxxxxxxx>
Sent: Thursday, January 25, 2018 1:57:48 PM
To: Tolley, Stuart
Cc: Nathan Potter; support@xxxxxxxxxxx
Subject: Re: [support] Data Request
Hi Stuart,
You can find more about how to use the form here:
https://opendap.github.io/documentation/QuickStart.html#_an_easy_way_using_the_browser_based_opendap_server_dataset_access_form
I can provide more specific help if you send me the URL of the form page. We provide
the software (Hyrax) but many institutions around the world deploy it and I
can’t know which dataset you are attempting to access without the URL.
Sincerely,
Nathan Potter
On Jan 25, 2018, at 3:51 AM, Tolley, Stuart <st514@xxxxxxxxxxxx> wrote:
Dear Sir/Madame,
I am currently trying to download data using your dataset access form, however
I am finding it very difficult to understand. The data I am trying to access is:
Project= CMIP5
model=HadGEM2-es
experiment=RCP4.5
The main variable I'm looking for is pH.
The specific area I need it in is a region of sea off the British Coastline:
Latitude= 51-52
Longitude= 1.7-2.55.
The time I require if for the year 2050 and 2100.
Could you please help me download this data!
Regards,
Stuart Tolley
= = =
Nathan Potter ndp at opendap.org
OPeNDAP, Inc. +1.541.231.3317
= = =
Nathan Potter ndp at opendap.org
OPeNDAP, Inc. +1.541.231.3317
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