Re: [thredds] NcML and the <geospatialCoverage> element

  • To: Nathan Potter <ndp@xxxxxxxxxxx>
  • Subject: Re: [thredds] NcML and the <geospatialCoverage> element
  • From: Ted Habermann <Ted.Habermann@xxxxxxxx>
  • Date: Thu, 21 Jan 2010 12:05:06 -0700
Nathan et al.,

Since Roy made me aware of this I have done some thinking about the relationship between these attributes and the ISO standard. My current thoughts are summarized here:
https://www.nosc.noaa.gov/dmc/swg/wiki/index.php?title=NetCDF_Attribute_Convention_for_Dataset_Discovery

If people are using these recommendations, we plan to develop a tool for extracting data discovery content and ingesting it into a catalog-level discovery tool.

Ted

Nathan Potter wrote:


Greetings,

Any idea how many people are using the UNIDATA's NetCDF Attribute Convention for Dataset Discovery??

If Roy's site is the primary (only?) example of it in actual use, and we accept Benno's point that the name attribute *Metadata_Conventions* is redundant, should we not consider amending the draft to change the attribute name from *Metadata_Conventions* to *Conventions*?

(Assuming that it hasn't been push passed the draft spec: Dataset Discovery NetCDF Attribute Convention <http://www.unidata.ucar.edu/software/netcdf-java/formats/DataDiscoveryAttConvention.html>)


If we don't change it might we amend the draft to explicitly make the attributes *Metadata_Conventions* and *Conventions* synonymous?


Nathan






On Jan 14, 2010, at 9:44 AM, Roy Mendelssohn wrote:

There are metadata in our files that follows all of those conventions. In trying to relay that act, we felt this was the best way to relay that fact. So you will find the metadata required for CF, the Coastwatch conventions, and the Unidata Data Discovery Conventions.

-Roy


On Jan 14, 2010, at 9:40 AM, Benno Blumenthal wrote:

OK, again trying desperately to understand your cryptic e-mails,

http://thredds1.pfeg.noaa.gov/thredds/dodsC/satellite/SW/chla/1day.das

has many of those attributes.   You did, however, say

String Conventions "COARDS, CF-1.0, Unidata Dataset Discovery v1.0, CWHDF";

whereas the document suggested looking for

String Metadata_Conventions = "Unidata Dataset Discovery v1.0";


What you are doing, of course, makes sense.  Did the original document
get corrected over time?

Benno


On Thu, Jan 14, 2010 at 12:31 PM, Roy Mendelssohn
<Roy.Mendelssohn@xxxxxxxx <mailto:Roy.Mendelssohn@xxxxxxxx>> wrote:

No we use it extensively. Look at any of he satellite data at our TDS (http://oceanwatch.pfeg.noaa.gov/thredds/catalog.html). It is just since this is not automatically produced by the TDS that we have a program of our own that generates our catalogs.

-Roy

On Jan 14, 2010, at 9:18 AM, Benno Blumenthal wrote:

So, to be really concrete, despite this convention of using netcdf attributes to insert metadata which you just pointed us to, you don't use it at all, you just scan your netcdf files yourself and generate the TDS XML directly.

Benno

On Thu, Jan 14, 2010 at 12:14 PM, Roy Mendelssohn <Roy.Mendelssohn@xxxxxxxx <mailto:Roy.Mendelssohn@xxxxxxxx>> wrote: We did this "by hand" (well actually we have a program that does it) in generating our catalogs not certain ow others do it.

-Roy

On Jan 14, 2010, at 8:56 AM, Nathan Potter wrote:



Roy,

Briefly scanning that page it looks like this gist of it is that one could use NcML to add/complete a "Unidata Dataset Discovery v1.0" set of metadata to a data set. THis could then be harvested by the TDS, or by other software that understood the "Unidata Dataset Discovery v1.0" convention.

Is that the general idea?

N



On Jan 14, 2010, at 8:41 AM, Roy Mendelssohn wrote:

Hi Nathan:

Look at:

http://www.unidata.ucar.edu/software/netcdf-java/formats/DataDiscoveryAttConvention.html

-Roy

On Jan 14, 2010, at 8:33 AM, Nathan Potter wrote:




Greetings,

I have some questions about the origin of the thredds:geospaptialCoverage element that is commonly found in THREDDS catalogs. It is my understanding that:

- The TDS can generate this metadata element by interrogating certain types of source data files. - People that write their own THREDDS catalog files to be served by the TDS can add the thredds:geospaptialCoverage metadata directly to their catalogs (using whatever process they wish).

Is the thredds:geospaptialCoverage also something that can be added through normal channels in NcML augmented data sets?



= = =
Nathan Potter                        ndp at opendap.org
OPeNDAP, Inc.                        +1.541.231.3317




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**********************
"The contents of this message do not reflect any position of the U.S. Government or NOAA."
**********************
Roy Mendelssohn
Supervisory Operations Research Analyst
NOAA/NMFS
Environmental Research Division
Southwest Fisheries Science Center
1352 Lighthouse Avenue
Pacific Grove, CA 93950-2097

e-mail: Roy.Mendelssohn@xxxxxxxx <mailto:Roy.Mendelssohn@xxxxxxxx> (Note new e-mail address)
voice: (831)-648-9029
fax: (831)-648-8440
www: http://www.pfeg.noaa.gov/

"Old age and treachery will overcome youth and skill."
"From those who have been given much, much will be expected"


= = =
Nathan Potter                        ndp at opendap.org
OPeNDAP, Inc.                        +1.541.231.3317





**********************
"The contents of this message do not reflect any position of the U.S. Government or NOAA."
**********************
Roy Mendelssohn
Supervisory Operations Research Analyst
NOAA/NMFS
Environmental Research Division
Southwest Fisheries Science Center
1352 Lighthouse Avenue
Pacific Grove, CA 93950-2097

e-mail: Roy.Mendelssohn@xxxxxxxx <mailto:Roy.Mendelssohn@xxxxxxxx> (Note new e-mail address)
voice: (831)-648-9029
fax: (831)-648-8440
www: http://www.pfeg.noaa.gov/

"Old age and treachery will overcome youth and skill."
"From those who have been given much, much will be expected"




--
Dr. M. Benno Blumenthal benno@xxxxxxxxxxxxxxxx <mailto:benno@xxxxxxxxxxxxxxxx>
International Research Institute for climate and society
The Earth Institute at Columbia University
Lamont Campus, Palisades NY 10964-8000   (845) 680-4450

**********************
"The contents of this message do not reflect any position of the U.S. Government or NOAA."
**********************
Roy Mendelssohn
Supervisory Operations Research Analyst
NOAA/NMFS
Environmental Research Division
Southwest Fisheries Science Center
1352 Lighthouse Avenue
Pacific Grove, CA 93950-2097

e-mail: Roy.Mendelssohn@xxxxxxxx <mailto:Roy.Mendelssohn@xxxxxxxx> (Note new e-mail address)
voice: (831)-648-9029
fax: (831)-648-8440
www: http://www.pfeg.noaa.gov/

"Old age and treachery will overcome youth and skill."
"From those who have been given much, much will be expected"




--
Dr. M. Benno Blumenthal benno@xxxxxxxxxxxxxxxx <mailto:benno@xxxxxxxxxxxxxxxx>
International Research Institute for climate and society
The Earth Institute at Columbia University
Lamont Campus, Palisades NY 10964-8000   (845) 680-4450

**********************
"The contents of this message do not reflect any position of the U.S. Government or NOAA."
**********************
Roy Mendelssohn
Supervisory Operations Research Analyst
NOAA/NMFS
Environmental Research Division
Southwest Fisheries Science Center
1352 Lighthouse Avenue
Pacific Grove, CA 93950-2097

e-mail: Roy.Mendelssohn@xxxxxxxx <mailto:Roy.Mendelssohn@xxxxxxxx> (Note new e-mail address)
voice: (831)-648-9029
fax: (831)-648-8440
www: http://www.pfeg.noaa.gov/

"Old age and treachery will overcome youth and skill."
"From those who have been given much, much will be expected"


= = =
Nathan Potter                        ndp at opendap.org
OPeNDAP, Inc.                        +1.541.231.3317




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==== Ted Habermann ===========================
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