[CF-metadata] MSG CPP standard names, projection and WMS service

From: John Caron <caron>
Date: Tue, 24 Jan 2012 17:05:10 -0700

On 1/24/2012 3:12 AM, plieger wrote:
> Hi John and Martin,
>
> John: Thanks a lot for the information. I put the MSGnavigation properties in the file, and the
> projection now fits much better than the vertical perspective projection. Attached you will see a
> screenshot of the longitude variable with this projection. At the edges of the globe I still see a
> small offset of 0-0.1 degrees, but this is changing more or less where you query.
> I tinkered a little bit with the height_from_earth_center and the semi_major and semi_minor axis,
> but did not result in a noticable change of the projection. The 2D latitude and longitude fields are
> always provided with these files so the projection can be verified with these fields.
>
>> char projection
>> projection:proj4_params = "+proj=geos +lon_0=0.000000 +lat_0=0 +h=35807.414063 +a=6378.169 +b=6356.5838" ;
>> projection:grid_mapping_name = "MSGnavigation" ;
>> projection:longitude_of_projection_origin = 0.f ;
>> projection:latitude_of_projection_origin = 0.f ;
>> projection:semi_major_axis = 6356584.f ;
>> projection:semi_minor_axis = 6378169.f ;
>> projection:height_from_earth_center = 4.216397e+07f ;
>> projection:scale_x = 35785.83f ;
>> projection:scale_y = -35785.83f ;
>

Hi Maarten:

Yes, it seems as good as Ive seen.

How did you generate your projection coordinates and your lat/lon
coordinates?

John
Received on Tue Jan 24 2012 - 17:05:10 GMT