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[idvusers] reading model grids from nc files

I have a GeoGrid object, derived from a nc file of a model run. using the cf1.0 conventions, the nc file describes say a lambert projection. The math type of my data may then be 

(Time -> ((XC[unit:km], YC[unit:km]) -> surface_temperature[unit:Pa]))
I am now trying to convert the x,y grid 'points' back to lat,lon, since I need to produce a bounding box of the data according to some other projection. 

I cannot see how to proceed.  is VisADMath.java helpful at all?
I could always open the nc file manually, figure out the projection and Y, X variable values and convert all values to reference lat,lon, but I was hoping that this be done already in the IDV classes. 

Any help appreciated

Stuart
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