"Blocked" outlines?

[strandwg@xxxxxxxxxxxxx (Gary Strand)]

I'd like to be able to get exact outlines of our bathymetry/blocked points. Is
there an easy way to do it with ferret?

I've been using the following script with contour plots, and it's close, but
not quite:

contour/over/set/nolabels missing ($1,-999)
ppl lev (-10,-10,1,-3) dark(-10,-10,1) pen(-10,-10,0,1)
ppl contour/over

I'd like to be able to get the outlines for both XY and XZ/YZ plots. Any sug-
gestions are most welcome.

Thanks.

-- 
Gary Strand
strandwg@ucar.edu                              http://www.cgd.ucar.edu/ccr/gary