[netCdfJava #GHS-962005]: Geoloc functions

• To: dmurray@xxxxxxxxxxxxxxxx
• Subject: [netCdfJava #GHS-962005]: Geoloc functions
• From: "Unidata netCDF Java Support" <support-netcdf-java@xxxxxxxxxxxxxxxx>
• Date: Thu, 13 Apr 2006 16:02:57 -0600

Hi Roger:

The ucar.unidata.geoloc package implements a number of projective geometry 
transformations, mostly on the sphere. This reflects our original motivation to 
support global and synoptic models which have resolutions on the order of 
several degrees, so that there was not much point in trying to be more exact in 
our geolocation. As models and satellite data resolution has gotten higher, we 
have realized the need to specify the datum, etc. We added UTM reletively 
recently by building on contributions from Dan Toms (SRI International), using 
i think polynomial approximations that make it quite fast. Speed remains an 
important concern for us, as we often do the transformations "on the fly". I am 
not particularly familiar with what the state of the art here is, nor of all 
the subtleties of datums. We have been planning on creating a working subgroup 
of the CF Convention group to clarify matters within the context of CF 
modeling. 

In short, we could sorely use your help in defining exactly how to extend our 
current functionality, and in implementing it. It sounds like you are in a good 
position to do so, and we would very much like to add your contributions to the 
IDV/CDM libraries.

I look forward to hearing more about what you think can be done.

Thanks,
John 

Ticket Details
==================
Ticket ID: GHS-962005
Department: Support netCDF Java
Priority: Normal
Status: Open