Re: [cf-satellite] CF Swath Data Proposal for Review

NOTE: The cf-satellite mailing list is no longer active. The list archives are made available for historical reasons.

  • To: "cf-satellite@xxxxxxxxxxxxxxxx" <cf-satellite@xxxxxxxxxxxxxxxx>
  • Subject: Re: [cf-satellite] CF Swath Data Proposal for Review
  • From: Aleksandar Jelenak <ajelenak@xxxxxxxxxxxx>
  • Date: Fri, 2 Jun 2017 14:48:11 +0000
  • Authentication-results: unidata.ucar.edu; dkim=none (message not signed) header.d=none;unidata.ucar.edu; dmarc=none action=none header.from=hdfgroup.org;
  • Spamdiagnosticmetadata: NSPM
  • Spamdiagnosticoutput: 1:99
Hi Randy,

On Jun 1, 2017, at 12:28 PM, Randy Horne 
<rhorne@xxxxxxxxxxxxxxxxx<mailto:rhorne@xxxxxxxxxxxxxxxxx>> wrote:
(1)
I have one overarching question.

Boiling down what you have written down, I think you are asking the CF standard 
to be extended to include several swath feature types: multibandSwath, 
multibandImageSwath, swath, imageSwath, profileSwath, multibandProfileSwath, 
FORProfileSwath - as you allude to in the beginning of the paper.  Is this 
correct ?

Yes. At this point I am not sure exactly what part of the proposal will make it 
into the CF convention but the intention is to have a chapter on swath data in 
there like for the Discrete Sampling Geometries.

One other issue worth mentioning …

(2)
In the interest in NOT letting a mistake we made in the application of CF 
conventions to GOES-R products represented on a standard angular grid, 
propagate to swaths ….

When you declare that projection_x_coordinate and projection_y_coordinate have 
units = “radians”. This is not allowed because the canonical units for these 
standard_names are meters.  If I had to do it over again, I would have asked 
for new standard names, something like projection_x_angular_coordinate and 
projection_y_angular_coordinate.

Thanks! I admit not checking what the canonical units were for these two 
standard names.

How is this for the new standard name proposal:

projection_x_angular_coordinate
Canonical units: radian
Definition: "x" indicates a vector component along the grid x-axis, when this 
is not true longitude, positive with increasing x. Angular projection 
coordinates are angular distances in the x- and y-directions on a plane onto 
which the surface of the Earth has been projected according to a map 
projection. The relationship between the angular projection coordinates and 
latitude and longitude is described by the grid_mapping.


-Aleksandar
  • 2017 messages navigation, sorted by:
    1. Thread
    2. Subject
    3. Author
    4. Date
    5. ↑ Table Of Contents
  • Search the cf-satellite archives: