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[netCDF #ZCD-209044]: support for the new "geostationary" projection

Hi Randy:

This issue is now in JIRA at:

https://bugtracking.unidata.ucar.edu/browse/TDS-538

So I am closing this support ticket. Hopefully we will get a resolution soon.

John

> John:
> 
> Once again, its me.
> 
> I hav touched base with Martin Raspaud about the sweep_angle_axis parameter 
> discrepancy.  The sweep angle axis discussion in the note of the #72 track 
> ticket item is correct and the proj.4 web-site 
> (http://trac.osgeo.org/proj/wiki/proj%3Dgeos) is incorrect.  Martin has 
> submitted a request to get it fixed.
> 
> very respectfully,
> 
> randy
> 
> 
> On Dec 6, 2013, at 6:54 AM, Randy Horne <address@hidden> wrote:
> 
> > John:
> >
> > It is me again.  I think the redlines to the 1999 CGMS spec I provided you 
> > have a sign error.  I will chase this to ground.
> >
> > v/r
> >
> > rh
> >
> >
> > On Dec 5, 2013, at 9:19 PM, Randy Horne <address@hidden> wrote:
> >
> >> John:
> >>
> >> (1)
> >> I don't know what the issue is with the eumetsat site.
> >>
> >> I think the document can also be found at:
> >>
> >> http://www.cgms-info.org/docs/default-source/technical-publications/cgms-lrit-hrit-global-specification-(v2-8-of-30-oct-2013).pdf?sfvrsn=8
> >>
> >> The equations in this document are for the meteosat satellite 
> >> geostationary projection.  I have attached redlines to the equations 
> >> needed for the GOES geostationary projection.  Note that the redlines were 
> >> applied to the 1999 version of the LRIT-HRIT global specification.
> >>
> >>
> >> (2)
> >> The projection has already been implemented by the Europeans in the proj.4 
> >> library.  checkout:
> >>
> >> http://trac.osgeo.org/proj/wiki/proj%3Dgeos.
> >>
> >> Note that after looking it over, there appears to be a discrepancy in how 
> >> the sweep_angle_axis is interpreted.  I sent an email to Martin Raspaud, 
> >> the guy who developed the geostationary projection s/w for prom.4,  This 
> >> sweep_angle_axis is what distinguishes the meteosat geostationary 
> >> projection from the GOES geostationary projection.
> >>
> >> (3)
> >> I have a very good description of the GOES variant of the geostationary 
> >> projection and I also have a pretty well document excel spreadsheet that 
> >> implements the mapping between geostationary projection fixed grid 
> >> coordinates and lat/lon.  Let me know if you want them.
> >>
> >> v/r
> >>
> >> rh
> >>
> >>
> >> <LRIT_HRIT_Projection_GOES_modification.pdf>
> >>
> >>
> >> On Dec 5, 2013, at 5:52 PM, "Unidata netCDF Java Support" <address@hidden> 
> >> wrote:
> >>
> >>> Hi Randy:
> >>>
> >>> Im starting to look at this, and I see that
> >>>
> >>> http://www.eumetsat.int/idcplg?IdcService=GET_FILE&dDocName=PDF_CGMS_03&RevisionSelectionMethod=LatestReleased.
> >>>
> >>> from
> >>>
> >>> https://cf-pcmdi.llnl.gov/trac/ticket/72
> >>>
> >>> is giving a 404. Do you have a copy of that doc?
> >>>
> >>> John
> >>>
> >>>
> >>>
> >>>> Lansing et al:
> >>>>
> >>>> How are you ?  Randy Horne here.
> >>>>
> >>>> I am following up on an email I sent you 7 months ago regarding the 
> >>>> recently added "geostationary" projection. sorry for the delay, but 
> >>>> things took WAY longer than anticipated .
> >>>>
> >>>> I finally have a decent "geostationary" projection dataset.  There is an 
> >>>> extra attribute added by the NetCDF library s/w because we are not 
> >>>> creating variables in the correct order, but hopefully it should not 
> >>>> affect your testing.
> >>>>
> >>>> The file I am sending you is of the continental United States from the 
> >>>> GOES East slot at -75 degrees east longitude.  Note that the y and x 
> >>>> coordinate variables are scaled integers.  Also note that there is a "t" 
> >>>> dimension, which is set to 1, that is in the process of being removed 
> >>>> from the product because it is superfluous.
> >>>>
> >>>> The resolution of the data is approximately 1 kilometer (28 micro 
> >>>> radians from the perspective of the satellite to be exact).  The GOES-R 
> >>>> system will be generating imagery at a variety of resolutions.
> >>>>
> >>>> In addition to making available a netCDF file (.nc), I am also making 
> >>>> available a png file so you can see what it looks like without using 
> >>>> netCDF tools.  The image has plenty of contrast so it should be good 
> >>>> enough to verify the geostationary projection s/w you are writing works 
> >>>> properly.  Let me know if you need any additional information on the 
> >>>> geostationary projection…I have plenty of info that I can send you.
> >>>>
> >>>> The .nc and .png files are available from the Harris Corporation 
> >>>> web-site.  Here are the addresses you can paste into the browser URL 
> >>>> field.
> >>>>
> >>>> ftp.harris.com/pub/incoming/test.nc
> >>>>
> >>>> ftp.harris.com/pub/incoming/test.png
> >>>>
> >>>>
> >>>> I understand you guys are probably busy with other things, but when you 
> >>>> get around to it, I would appreciate it if you let me know how things 
> >>>> work out with the dataset and the geostationary projection s/w you guys 
> >>>> are writing.
> >>>>
> >>>>
> >>>> very respectfully,
> >>>>
> >>>> randy
> >>>>
> >>>>
> >>>>
> >>>>
> >>>> On Apr 25, 2013, at 7:53 PM, Randy Horne <address@hidden> wrote:
> >>>>
> >>>>> Lansing:
> >>>>>
> >>>>> Our I&T team is still working to put a "good" product file together.
> >>>>>
> >>>>> Sorry about the delay.
> >>>>>
> >>>>> As soon as we have a good/representative product file, I will let you 
> >>>>> know.
> >>>>>
> >>>>>
> >>>>> very respectfully,
> >>>>>
> >>>>> randy
> >>>>>
> >>>>>
> >>>>> On Apr 10, 2013, at 5:24 PM, Unidata netCDF Java Support wrote:
> >>>>>
> >>>>>> Hi Randy,
> >>>>>>
> >>>>>> John Caron is out of the office for a conference, but I'll step in and 
> >>>>>> say "yes," we'd like sample data sets.  I don't know how much he has 
> >>>>>> done, but we'll need the files regardless.  Where would they be 
> >>>>>> available?
> >>>>>>
> >>>>>> Regards,
> >>>>>> Lansing Madry
> >>>>>> Unidata
> >>>>>> Boulder, Colorado
> >>>>>>
> >>>>>>> Dear Sir:
> >>>>>>>
> >>>>>>> My name is Randy Horne.  I am working the GOES-R ground segment 
> >>>>>>> program.
> >>>>>>>
> >>>>>>> I am a member of the cf_metadata and cf_satellite message groups.
> >>>>>>>
> >>>>>>> Last year, I was an active participant in the establishment of a new
> >>>>>>> earth projection to support data received from geostationary 
> >>>>>>> satellites.
> >>>>>>>
> >>>>>>> This new projection is "geostationary" and was approved.
> >>>>>>>
> >>>>>>> Shortly after it was approved, I believe Jon Caron (one of your guys)
> >>>>>>> worked on the "geostationary" projection software.  He asked us for 
> >>>>>>> some
> >>>>>>> test data sets, but at the time we did not have any.
> >>>>>>>
> >>>>>>> I had the impression Jon Caron was writing this software so Unidata
> >>>>>>> could add this new projection to the list of projections currently
> >>>>>>> supported (see
> >>>>>>>
> >>>>>>> http://www.unidata.ucar.edu/software/netcdf-java/v4.2/javadoc/
> >>>>>>>
> >>>>>>> Currently, the "geostationary" projection is not listed on this web
> >>>>>>> page.
> >>>>>>>
> >>>>>>> Can you provide me a status of where this effort is?
> >>>>>>>
> >>>>>>> Note that we now have test data sets available should they be needed.
> >>>>>>>
> >>>>>>> very respectfully,
> >>>>>>>
> >>>>>>> randy
> >>>>>>>
> >>>>>>>
> >>>>>>
> >>>>>>
> >>>>>> Ticket Details
> >>>>>> ===================
> >>>>>> Ticket ID: ZCD-209044
> >>>>>> Department: Support netCDF Java
> >>>>>> Priority: Normal
> >>>>>> Status: Open
> >>>>>>
> >>>>>
> >>>>>
> >>>>> ____________________________________
> >>>>>
> >>>>> Randy C. Horne (address@hidden)
> >>>>> Principal Engineer, Excalibur Laboratories Inc.
> >>>>> voice & fax: (321) 952.5100
> >>>>> url: http://www.excaliburlabs.com
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>
> >>>>
> >>>> ____________________________________
> >>>>
> >>>> Randy C. Horne (address@hidden)
> >>>> Principal Engineer, Excalibur Laboratories Inc.
> >>>> voice & fax: (321) 952.5100
> >>>> url: http://www.excaliburlabs.com
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>
> >>> Ticket Details
> >>> ===================
> >>> Ticket ID: ZCD-209044
> >>> Department: Support netCDF Java
> >>> Priority: Urgent
> >>> Status: Open
> >>>
> >>
> >>
> >> ____________________________________
> >>
> >> Randy C. Horne (address@hidden)
> >> Principal Engineer, Excalibur Laboratories Inc.
> >> voice & fax: (321) 952.5100
> >> url: http://www.excaliburlabs.com
> >>
> >>
> >>
> >>
> >
> >
> > ____________________________________
> >
> > Randy C. Horne (address@hidden)
> > Principal Engineer, Excalibur Laboratories Inc.
> > voice & fax: (321) 952.5100
> > url: http://www.excaliburlabs.com
> >
> >
> >
> >
> 
> 
> ____________________________________
> 
> Randy C. Horne (address@hidden)
> Principal Engineer, Excalibur Laboratories Inc.
> voice & fax: (321) 952.5100
> url: http://www.excaliburlabs.com
> 
> 
> 
> 
> 
> 

Ticket Details
===================
Ticket ID: ZCD-209044
Department: Support netCDF Java
Priority: Critical
Status: Closed