Re: [Ferret] How can i draw a basemap with white glaciers?

[Gary Strand <strandwg@xxxxxxxx>]

On 14 Jun 2005, at 01:55, Ingo.Bethke@student.uib.no wrote:
> I'm interested in plotting global ocean lon/lat data together with land
> topography which is masked white over Greenland and Antarctica. Any 
> ideas how to
> achieve this?
The easiest way that I know of, and have used, is to set all positive 
topography heights to a fixed value, and the shade that field with the 
same value and use the 'white' palette:

set reg/y=90S:60S
let antarctica = if topo gt 0 then 10000
shade/pal=white/lev=(10000) antarctica

or something like that. You can do the same for Greenland.

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