Re: [ldm-users] GOES-16 nadir longitude question

• To: "Greg Thompson" <gthompsn@xxxxxxxx>, ldm-users@xxxxxxxxxxxxxxxx
• Subject: Re: [ldm-users] GOES-16 nadir longitude question
• From: "Patrick L. Francis" <wxprofessor@xxxxxxxxx>
• Date: Tue, 09 Jan 2018 19:51:49 +0000

Can anyone clarify whether there is a real discrepancy between the longitude (nadir) where I thought NOAA was declaring G16 operational, which was 75.2 degrees (west) and the value found in the actual netCDF files that states 75.0 degrees?

I can confirm the netcdf for you

Driver: netCDF/Network Common Data Format
Size is 1808, 1808
Coordinate System is:
PROJCS["unnamed",
    GEOGCS["unknown",
        DATUM["unknown",
            SPHEROID["Spheroid",6378137,298.2572220960422]],
        PRIMEM["Greenwich",0],
        UNIT["degree",0.0174532925199433]],
    PROJECTION["Geostationary_Satellite"],
    PARAMETER["central_meridian",-75],
    PARAMETER["satellite_height",35785831],
    PARAMETER["false_easting",0],
    PARAMETER["false_northing",0],

Origin = (-5434865.725631997920573,-5434865.725630117580295)
Pixel Size = (6012.019607998958236,6012.019607998958236)
Metadata:
  fixedgrid_projection#grid_mapping_name=geostationary
  fixedgrid_projection#latitude_of_projection_origin=0
  fixedgrid_projection#longitude_of_projection_origin=-75.00000000000001
  fixedgrid_projection#perspective_point_height=35785831
  fixedgrid_projection#semi_major=6378137
  fixedgrid_projection#semi_major_axis=6378137
  fixedgrid_projection#semi_minor=6356752.31414
  fixedgrid_projection#semi_minor_axis=6356752.31414
  fixedgrid_projection#sweep_angle_axis=x
  NC_GLOBAL#abi_mode=3
  NC_GLOBAL#bit_depth=12
  NC_GLOBAL#central_wavelength=10.35
  NC_GLOBAL#channel_id=13
  NC_GLOBAL#Conventions=CF-1.6
  NC_GLOBAL#created_by=ldm-alchemy

As far is if it's actually where it's supposed to be

cheers,

--patrick


----
Patrick L. Francis
AerisWeather.com

http://modelweather.com/

• References:
  • [ldm-users] GOES-16 nadir longitude question
    • From: Greg Thompson