Re: [cf-satellite] Ang.: Making a proposal for the addition of the geos projection

• To: <cf-satellite@xxxxxxxxxxxxxxxx>
• Subject: Re: [cf-satellite] Ang.: Making a proposal for the addition of the geos projection
• From: Martin Raspaud <martin.raspaud@xxxxxxx>
• Date: Wed, 23 Nov 2011 11:34:45 +0100

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Hi again,

Replying to myself...


> 
> Geostationary
> -------------
> 
> grid_mapping_name = geos
> 
> 
> Map parameters:
> 
>         latitude_of_projection_origin
> 
>         longitude_of_projection_origin
> 
>         perspective_point_height
>       
>       scale_x
>       
>       scale_y
> 
>       offset_x
> 
>       offset_y
> 
>         false_easting
> 
>         false_northing
> 

Actually, we could use add_offset and scale_factor in the x and y
variables. x and y would then be integer pixel positions for example,
and scale and offset would transform them to viewing angles in radians.
The netcdf header would look like this (hand typed):

dimensions:
   y = 328;
   x = 580;
   reflective_bands = 5;
variables:
   short reflective_band_data(y, x, reflective_bands)
     :long_name = "Radiance of reflective bands of the SEVIRI instrument
(MSG)";
     :units = "milliwatts/m2/steradian/cm-1";
     :grid_mapping = "Projection";
     :coordinates = "y x";
   short x(x);
     :standard_name = "projection_x_coordinate";
     :add_offset = 1856
     :scale_factor = -208.16554260253906
     :units = "rad"
   short y(y);
     :standard_name = "projection_y_coordinate";
     :add_offset = 1856
     :scale_factor = -208.16554260253906
     :units = "rad"
   char Projection;
     :grid_mapping_name = "geos";
     :perspective_point_height = 35785831.;
     :semi_major_axis = 6378169.;
     :semi_minor_axis = 6356583.8;
     :latitude_of_projection_origin = 0.;
     :longitude_of_projection_origin = 0.;

What do you think ?

Best regards,
Martin
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• Follow-Ups:
  • Re: [cf-satellite] Ang.: Making a proposal for the addition of the geos projection
    • From: Tom Rink

• References:
  • [cf-satellite] Making a proposal for the addition of the geos projection
    • From: Martin Raspaud
  • Re: [cf-satellite] Making a proposal for the addition of the geos projection
    • From: John Caron
  • [cf-satellite] Ang.: Making a proposal for the addition of the geos projection
    • From: Raspaud Martin
  • Re: [cf-satellite] Ang.: Making a proposal for the addition of the geos projection
    • From: John Caron
  • Re: [cf-satellite] Ang.: Making a proposal for the addition of the geos projection
    • From: Martin Raspaud