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Re: NSDL metadata for THREDDS datasets

Thanks, Jeff.

Those are important points. We definitely have to keep them in mind as we go. My idea for now is to develop the framework in which the tools themselves will operate while we continue our investigation of the myriad of geospatial metadata standards. My concern is that we are spending nearly all our time trying to understand the details of these standards and we need to begin getting some hands-on experience with the process of building tools that will create usable metadata in environments where there are 10 products a second flowing into the servers.

With that in mind, I have two quick questions regarding your suggestion:

-- Is there a mapping between the standards you suggest and the NSDL DC-Ed recommendation?

-- Are you aware of cases where groups have defined how the fields would be used for the datasets I listed in my earlier message?

But let me emphasize that overall I agree with you that we need to address the question of these more detailed geospatial metadata standards before we make any of this work more "public" where it takes on a life of its own.

-- Ben

--On Friday, December 21, 2001 12:40 PM -0500 Jeff de La Beaujardiere <address@hidden> wrote:

Ben Domenico writes: # We are aware of the detailed standards of the FGDC, GCMD, those # evolving at ISO as well as the ESML definition at UAH. [...] # But, as a place to get started and gain some experience with the # metadata generation tools themselves, we're looking for something # simpler

The danger in choosing something simpler "to get started" is that once
chosen it is very difficult to get rid of.

# http://www.smete.org/nsdl/workgroups/standards/current_element_set.html

This appears only to address educational documents or modules, not
datasets.  Perhaps that is all you need, but you also wrote:

# In particular, we plan to start with the types of data found on many
# THREDDS servers:
#   -- gridded data output from weather forecast models,
#   -- GOES satellite imagery, NEXRAD level 3 images, and
#   -- point source weather observations and balloon soundings from
#   weather  stations
#   -- climate data

I recommend you consider whether a subset of FGDC CSDGM or ISO 19115
would meet your needs for dataset description.  Only some of the fields
therein are required.  See <http://www.fgdc.gov/metadata/contstan.html>.

Note also that specifications like the OGC Web Map Service have explicit
support for linking to FGDC or ISO metadata, and that the Office of
Management and Budget's e-government "Geospatial One-Stop" initiative
will be using FGDC metadata.

Jeff DLB

Dr Jeff de La Beaujardiere * Computer Scientist NASA Goddard Space Flight Center * Code 933 address@hidden * +1 301 286 1569 http://iniki.gsfc.nasa.gov/


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