elevation becomes altitude

["John J Brecht" <john.brecht@xxxxxxx>]

After a long hiatus, I'm back to my VisAD project!  I'm trying to get 
some old code working with the latest version of VisAD and I'm having 
this problem.

I am trying to create some data sets with the following MathType:

(Time, ((Longitude, Latitude) -> (Overlay, Elevation)))

where "overlay" is something like temperature or precipitation.  The 
overlays for some set of such data sets always cover the same geographic 
region, and thus I use the same elevation file for each one.  My source 
data sets are in the form of text files, which I convert to NetCDF files 
with a small app I wrote.  When I open a data set created in this way in 
the VisAD spreadsheet, I find that my elevation data have become 
"altitude."  Why is this?  How do I prevent it?  My code to create the 
elevation MathType looks like this:

RealType elevation = RealType.getRealType("Elevation", SI.meter);


-john