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Re: [galeon] [Fwd: [CF Metadata] #37: Conventions for Point Observation Data]

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  • To: "John Caron" <caron@xxxxxxxxxxxxxxxx>
  • Subject: Re: [galeon] [Fwd: [CF Metadata] #37: Conventions for Point Observation Data]
  • From: "Aaron Braeckel" <braeckel@xxxxxxxx>
  • Date: Wed, 22 Oct 2008 15:47:40 -0600 (MDT)
Why are stationTimeSeries and stationProfileTimeSeries specific to a
station?  The optional use of a station name is useful to include in some
cases, but I can see running into other cases where several data points
are gathered in a time series but there is no associated station.  In a
couple of documents the stationTimeSeries is likened to the CSML
PointSeriesFeature, but PointSeriesFeature does not include a station name
or related terminology.

The ":CF\:pointFeature" name could be generalized to ":CF\:cdmFeature" or
":CF\:featureType", assuming that there is no additional and necessary
semantics to these identifiers being point types vs general types.

Minor errata on the description page:
-There are several uses of "reletive humidity" instead of "relative humidity"
-Several "humidity" definitions have temperature markers in them
-"temperacture" is used instead of "temperature" a couple times

I may send along further comments, time allowing.

Aaron

FYI, I finally submitted a proposed convention for point obs data to the
CF group:

 http://www.unidata.ucar.edu/software/netcdf-java/CDM/CFpoints.html

feedback to http://cf-pcmdi.llnl.gov/trac/ticket/37 would be welcome.


#37: Conventions for Point Observation Data
----------------------------+-----------------------------------------------
 Reporter:  caron           |       Owner:  cf-conventions@xxxxxxxxxxxxxx
     Type:  enhancement     |      Status:  new
 Priority:  high            |   Milestone:
Component:  cf-conventions  |     Version:
 Keywords:  point           |
----------------------------+-----------------------------------------------
 == 1. Title ==

 Conventions for Point Observation Data

 == 2. Moderator ==

 TBD

 == 3. Requirement ==

 Current conventions are oriented towards gridded data. This proposal
 extends the framework to specify how to encode "point observation" data.

 == 4. Initial Statement of Technical Proposal ==

 We show six types of point observational data, and describe a general way
 to encode many variations. The main technical extension is a simple way
to
 describe ragged arrays, for the case when rectangular arrays are too
 inefficient.

 == 5. Benefits ==

 * Many data providers would like to use CF conventions when storing their
 observational data.

 * This will allow a standard for converting things like BUFR data into
 netCDF.

 == 6. Status Quo ==

 Currently sections 5.4 and 5.5 describe 2 examples of point observations
 (station time series and trajectories). This proposal generalizes those.

 == 7. Detailed Proposal ==

 Because of the length of this, I have created a
 [http://www.unidata.ucar.edu/software/netcdf-java/CDM/CFpoints.html
 seperate web page] to make it easy (for me) to edit. I can reformat later
 when it is close to being finished, or if others need to edit it.

 Some background docs and earlier drafts:

 * [http://www.unidata.ucar.edu/software/netcdf-java/CDM/CDMfeatures.doc
 CDM Feature Types]

 * [http://www.unidata.ucar.edu/software/netcdf-java/CDM/CDMpoints.doc CDM
 Point Feature Types]

 * [http://www.unidata.ucar.edu/staff/caron/papers/obs2.pdf Draft 2 of
 proposed spec for Point Observation netCDF encoding]





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