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Re: CUAHSI Observations Data Model

Hi Ben, David, All,
Thank you for bringing the hydrology data modeling effort to our attention. 
I can offer a few thoughts on this data model hamonization issue.
- In dealing with air quality point monitoring data, both practice and theory has shown that the relational data model proposed by CUAHSI is a robust way of encoding monitoring data. In fact virtually all AQ monintoring data are being managed through Relational DMS, in SQL servers. A typical (actual) AQ data schema is in slide 2.
- The relational model is suitable to encode and to respond to typical OGC queries for data (WCS), station description (WFS), sensor description (SOS) etc. Some ideas on this are noted in slide 3
- For web service-based data access, it should not matter how the data are encoded and managed, as long as they repond to the servvice query.
- In this view, the key in harmonizing between the two (two or five) data models is in the service return payload format. netCDF?, XLS, CSV, whatever is appropriate for the particualar client (community).
-  So, connecting the pipes   
I fully agree that bringing the two (three, four) communities together would be highly desirable byfor  harmonizing or

On 1/3/07, Ben Domenico <address@hidden> wrote:
Hi all,

The US hydrology community represented by CUAHSI  (Consortium of
Universities for the Advancement of Hydrologic Sciences, Inc.) HIS
(Hydrologic Information System) has drafted a document called "CUAHSI
Community Observations Data Model Working Design Specifications."
These design specifications are targetted at a relational database for
hydrologic point datasets that are collected at distributed hydrologic
observatories.  David Tarboton welcomes input from the THREDDS and OGC
communities, so I'm forwarding his message which has pointers to the
draft specifications and a questionnaire.

I am struck by the fact that the THREDDS group is developing storage
and access systems for the same sort of point/station observations via
our traditional netCDF approach


and the OGC Sensor Web Enablement (SWE) initiative addresses many of
the same data access issues from the perspective of standards-based


So we have two discipline-oriented communities of practice developing
very different approaches to data storage and access issues for
datasets that have many common characteristics and a group working
with evolving international standards in the same general area.  If
you look at the diagram in "The Middle Ground" section of


these projects are classic examples of the stovepipe foundations and
-- hopefully -- the conduit pipe between them.

I thought each group should at least be aware of the work of the others.

In addition, if any of you have input for David Tarboton, he welcomes
it before January 31st and has specific requests for feedback in the
questionnaire that he points to.

David Tarboton <address@hidden>

-- Ben

---------- Forwarded message ----------
From: David Tarboton <address@hidden>
Date: Dec 17, 2006 10:50 AM
Subject: CUAHSI Observations Data Model
To: Ben Domenico < address@hidden>
Cc: david Maidment <address@hidden>, address@hidden


The document, "CUAHSI Community Observations Data Model Working
Design Specifications",
(http://www.cuahsi.org/his/docs/ODM4-20061026.pdf ) presents the
current design for the integrated hydrologic observations database
that is proposed for the CUAHSI Hydrologic Information System
(HIS).  We are soliciting comments on this design to ensure that we
have a data model for observations that is simple, usable, and meets
the needs of hydrologic observatories and the CUAHSI
community.  There is much in common between what CUAHSI is doing in
Hydrology and what UNIDATA is doing in atmospheric science.  I am
sending this to you so that you may be aware of this work and provide
comments and suggestions on this design?  I have prepared a
questionnaire to guide your review
( http://www.cuahsi.org/his/docs/ODMOpenCommentQuestions.pdf),
although you should not feel constrained by this and should feel free
to provide feedback in whatever form you think is most
appropriate.  We would like to receive comments by January 31,
2007.  We appreciate you taking the time to help with this.

Thank you,


David Tarboton
Professor, Civil and Environmental Engineering
Utah Water Research Laboratory
Utah State University, Logan UT 84322-4110
Ph: (435) 797 3172        Fax: (435) 797 1185
Email:  address@hidden   http://www.engineering.usu.edu/dtarb
Learn about the USU Water Initiative:  http://water.usu.edu/

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