Hi Kevin, Sorry for the delay in responding. There range for Display.Radius is (0.01, 2.0). The lower bound of 0.01 is to avoid arithmetical singularities at Radius = 0. In order to get your "range" RealType value of 0.0 right at the center of the display (i.e., Radius = 0.0), change your: ranMap.setRange(1000.0, 800000.0); to: ranMap.setRange(4000.0, 800000.0); That is, the following three mappings all fall on the same linear line: 0.0 -> 0.0 4000.0 -> 0.01 800000.0 -> 2.0 Good luck, Bill On Fri, 20 Jan 2006, Kevin Manross wrote: > Greetings, > > I finally figured out a way to map my terrain data from a cartesian grid > to a radar-centric polar grid (This makes my data processing easier to > code and hopefully more efficient). I'm trying to display the data > using Display.Radius and Display.Longitude since the data are now in a > polar grid. Is there any way to eliminate the "hole" at the center of > such a plot? The cursor coordinates within this hole (using the > standard middle mouse button readout) display an area of range < 0; > > I have a sample program and associated terrain file at: > > ftp://ftp.nssl.noaa.gov/users/kmanross/ > > (you'll need to unzip the .nc file). > > Thanks!! > > -kevin.