To my recollection, we were leaning toward using user-specified grid 
exclusively. Since then, this issue has been largely buried under more urgent 
issues (this has never been a high priority issue except in the first couple of 
years, i.e., initial development by Cam/Peter and early stage of my involvement 
after peter left). There were some reasons for using user-specified grid (also 
to my recollection):

(1) The model-grid reference sometimes gave problem for multi-model evaluation 
because of truncation of latitude/longitude values in the netCDF file. This 
made the long/lat values inconsistent for different models. In addition, if 
unprocessed model outputs (i.e., individual models' own native grid), the 
model-referenced system have to accompany another option "choose the reference 
model data for defining domain".

(2) The obs-grid reference was planned to be included, but had very low 
priority because we (Peter/Cam/myself) didn't see any immediate case to use 
(it's been a placeholder since the beginning). As the code moves to use 
multiple observations, this has become largely forgotten.

(3) With the planned user-specified domain in the UI version, having users to 
specify their own analysis grid may be most useful.



-----------------------------------------------------------------
Jinwon Kim
Joint Institute for Regional Earth System Science and Engineering and Dept. 
Atmospheric and Oceanic Sciences
University of California, Los Angeles
607 Charles E Young Drive East, Young Hall, Room 4242, Los Angeles, CA 
90095-7228, USA
[email protected]; 310-206-2828
________________________________________
From: Cameron Goodale (JIRA) [[email protected]]
Sent: Friday, May 16, 2014 7:13 AM
To: [email protected]
Subject: [jira] [Resolved] (CLIMATE-49) Add the 'obs' regrid option into 
toolkit.do_data_prep.prep_data function

     [ 
https://issues.apache.org/jira/browse/CLIMATE-49?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Cameron Goodale resolved CLIMATE-49.
------------------------------------

    Resolution: Won't Fix

Cleaning up a legacy issue from JPL's RCMET codebase.  The 
'toolkit.do_data_prep.prep_data()' function has been deprecated.

> Add the 'obs' regrid option into toolkit.do_data_prep.prep_data function
> ------------------------------------------------------------------------
>
>                 Key: CLIMATE-49
>                 URL: https://issues.apache.org/jira/browse/CLIMATE-49
>             Project: Apache Open Climate Workbench
>          Issue Type: Bug
>          Components: analysis
>    Affects Versions: 0.2-incubating
>            Reporter: Cameron Goodale
>            Assignee: Cameron Goodale
>             Fix For: 0.4
>
>
> The toolkit should support the following regrid options: model, obs, user.  
> Currently the code doesn't support the obs option.
> Around line 132 there is an if elif block that needs to have an obs option 
> added to it.  This option block should closely map to the model option block.



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