speed of d.rast

Xin Zhuang zhuang at access.digex.net
Fri Aug 6 18:16:44 EDT 1993

I have a tract layer (600x400; resolution=30m).
Then I created another layer just part of the tract.
I meant 75% area were "no data" (cat=0).
In order to get the same color scheme, I physically
copied colr.tract to colr.new_layer. However,
the displaying of new_layer took 10 times as much
as d.rast tract. Can any one tell me why this happened?
Is this caused by so many "no data" cells
and thereby a lookup delay?

zhuang at access.digex.com

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