[netCDF #EVL-272024]: Standard Coordinate Transforms to Geo-locating gridded data

Hi Peter:

The problem is that you need to add xc and yc coordinate variables, which are 
used in the MSG projection. Im attaching a grib file with this projection. open 
in toolsui and look at those coordinates to see how its done.

im still downloading the second file from ftp. 

John

> Hi John,
> 
> Sorry for the delay, we had two EUMETSAT holidays this week.
> 
> You can find example files under the following FTP server:
> 
> >> ftp://ftp.eumetsat.int/pub/EUM/out/USD/Unidata_test_files
> 
> Can you let me know when you have downloaded them so that these files can be 
> deleted.
> 
> Thanks and Regards,
> 
> Pete.
> 
> -----Original Message-----
> From: Unidata netCDF Java Support [mailto:address@hidden]
> Sent: Saturday, October 29, 2011 12:50 AM
> To: Peter Miu
> Cc: Peter Miu; Michael Schick; Anastasia Andres; Jagmohan Khulbe
> Subject: [netCDF #EVL-272024]: Standard Coordinate Transforms to Geo-locating 
> gridded data
> 
> Hi Peter:
> 
> Do you have a file with this in it? its usually faster for me to debug these 
> problems with a real file.
> 
> Put it on ftp or http if its large. thanks
> 
> John
> 
> > Hi,
> >
> > We are investigating using the standard coordinate transforms to geo-locate 
> > the data
> > in our SEVIRI MSG15 data sets.  If we are able to do this, then we can 
> > reduce the size
> > of the MSG15 NetCDF files by removing the lat and lon arrays.
> >
> > Please take a look at the CDL of the NetCDF definition we have implemented.
> > The following is specified to provide the Unidata tools e.g. IDV, 
> > information
> > On how to geo-locating the data.
> >
> > char Space_View_Perspective_or_Orthographic;
> > :_CoordinateAxisTypes = "GeoX GeoY";
> > :longitude_of_projection_origin = 0.0; // double
> > :latitude_of_projection_origin = 0.0; // double
> > :height_from_earth_center = 4.2163970098E7; // double
> > :semi_major_axis = 6378140.0; // double
> > :grid_mapping_name = "MSGnavigation";
> > :_CoordinateTransformType = "Projection";
> > :earth_shape = "Earth oblate spheroid with axes specified by producer in m";
> > :scale_y = -35785.830098; // double
> > :scale_x = 35785.830098; // double
> > :semi_minor_axis = 6356755.5; // double
> >
> > This does not work so can you provide us with some information on how to 
> > specify these coordinate transforms correctly.
> > We can upload an example NetCDF file with this defined to your server for 
> > you to used if it would help with the analysis.
> >
> > Regards,
> >
> > Peter Miu
> > Data Services Operations Engineer
> > EUMETSAT
> > EUMETSAT Allee 1
> > 64295 Darmstadt
> > Germany
> >
> > Tel: +49 6151 807 3290
> > URL: http://archive.eumetsat.int
> >
> >
> >
> 
> 
> Ticket Details
> ===================
> Ticket ID: EVL-272024
> Department: Support netCDF Java
> Priority: Normal
> Status: Open
> 
> 


Ticket Details
===================
Ticket ID: EVL-272024
Department: Support netCDF Java
Priority: Normal
Status: Open

Attachment: Eumetsat.VerticalPerspective.grb
Description: Binary data