CF

From Federation of Earth Science Information Partners
(Difference between revisions)
Jump to: navigation, search
m (External Links)
m (The CF Standards Cluster)
 
(15 intermediate revisions by 4 users not shown)
Line 1: Line 1:
=The CF Standards Cluster=
+
=The CF Conventions Cluster=
  
==Objectives==
+
Information about the Climate Forecast Conventions has moved to [[:Category:Climate Forecast Conventions | Climate Forecast Conventions]].
:Propose extensions to the CF naming conventions that are relevant to observational data
+
:Create use cases and interoperability demos that demonstrate the value of CF usage in remote sensing
+
:Provide tutorials at Federation meetings on the use of the CF conventions
+
  
==Get Involved: Monthly Telecons==
+
[[Category:CollabArea]][[category:Climate Forecast Conventions]]
:Next telecon:
+
::Monday Dec 12, 3pm ET / 12noon PT
+
::Dial: 877-668-4493
+
::Access code: 23138379
+
::Agenda:
+
:::Winter Meeting Plans
+
:::Selection of Cluster Chair
+
 
+
:Minutes of past telecons/meetings:
+
 
+
== Possible CF Extensions ==
+
:1. Spectral bands
+
::Define as dimension rather than coordinate variable
+
::Pre-define band names
+
::Pre-define by wavelength/frequency range
+
 
+
:2. Data quality
+
::Modifiers such as "percent_cloud_free"
+
 
+
:3. Swath geometry
+
::Orbital parameters
+
 
+
:4. Engineering parameters
+
::Calibration tables
+
 
+
== CF-Aware Tools ==
+
 
+
==Spectral Band Proposal by Tom Whittaker==
+
Create standard_names that can be recognized by applications as
+
being the special "band dimension" variable (similar to "time").
+
The name of this dimension variable would not, however, be specified,
+
but inferred from its attributes.
+
 
+
Create two coordinate axis types ("wavelength" and "wavenumber")
+
that can be recognized by the NetCDF library as defining a "spectral
+
coordinate".
+
 
+
Thus, the band dimension might be declared:
+
 
+
:<variable name="band" shape="band" type="float" >
+
::<attribute name="standard_name" value="wavelength" />
+
::<attribute name="units" value = "cm" />
+
::<attribute name="_CoordinateAxisType" value = "wavelength" />
+
:</variable>
+
 
+
The dimension variable can then be used to dimension arrays associated
+
with the spectral channels, e.g., wavelength boundaries for each band
+
(channel), units, scaling, etc.  The use of these (dimensioned)
+
variables, however, would be up to the application developers rather
+
than made part of the conventions, per se.
+
 
+
This would necessitate creating perhaps two new standard_names:
+
 
+
'''wavelength''' (there is already a "radiation_wavelength" with
+
"electromagnetic_wavelength" as an alias, but I don't see an
+
issue for making just "wavelength" a standard name, either.  I also
+
recognize that in most cases this refers to the center wavelength of
+
the band/channel, and perhaps should be so designated...?).
+
 
+
'''wavenumber'''  (There is no equivalent standard_name.  Again, I imagine this would actually refer to a center wavenumber).
+
 
+
We would also then need to define two new coordinate axis types:
+
wavelength and wavenumber.
+
 
+
For the case where people don't or can't use the dimension variable as
+
a coordinate variable, we recommend that they use the convention name
+
"band" as the dimension variable so that applications can at least
+
recognize this for what it is.
+
 
+
In all cases, new (dimensioned) variables could then be used to
+
specify band-specific attributes.  For example:
+
 
+
:<variable name="minimum_wavelength" shape="band" type="double">
+
::<attribute name="units" value="cm" />
+
:</variable>
+
 
+
== Join the Cluster e-mail list ==
+
:http://www.lists.esipfed.org/mailman/listinfo/esip-cf
+
 
+
== External Links ==
+
:CF Home Page
+
http://cf-pcmdi.llnl.gov
+
:Read the CF-satellite archives (UCAR):
+
http://www.unidata.ucar.edu/mailing_lists/archives/cf-satellite
+
:Join the CF-satellite e-mail list (UCAR):
+
http://mailman.unidata.ucar.edu/mailman/listinfo/cf-satellite
+
 
+
== Governance ==
+
Interim Chair: Rob Raskin  raskin at jpl.nasa.gov
+
 
+
[[Category:CollabArea]]
+

Latest revision as of 17:00, 23 April 2012

[edit] The CF Conventions Cluster

Information about the Climate Forecast Conventions has moved to Climate Forecast Conventions.

Personal tools
Namespaces

Variants
Actions
Navigation
Toolbox