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

Hi Randy

We are releaseing 4.5.3 today that has this CF geostationary projection in it. 
Please let us know if you see any problems. 

thanks!

John


> 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