From grass-lists-owner@max.cecer.army.mil Mon Oct 11 07:46:22 1993
Date: Mon, 11 Oct 1993 14:38:13 GMT
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From: copeland@lamar.ColoState.EDU (Jeffrey Copeland)
Subject: MASKS
Sender: news@yuma.ACNS.ColoState.EDU (News Account)
Message-ID: <Oct11.143811.18889@yuma.ACNS.ColoState.EDU>
Date: Mon, 11 Oct 1993 14:38:11 GMT
Nntp-Posting-Host: lamar.acns.colostate.edu
Organization: Colorado State University
Lines: 14I'm trying to create a MASK for a hand drawn area. I can see how to
take a vector area and get a raster file from that, but how do I get
the raster file to have 2 categories, 1 inside mask line and the other
outside.-------------------------------------------------------------------------------
Jeffrey Copeland | We're wanted men,
Colorado State University | We'll strike again,
Atmospheric Science | But first let's have a beer!
303-491-8502 |
copeland@homebrew.atmos.colostate.edu | J.Buffet, Great Filling Station Holdup
-------------------------------------------------------------------------------
Assuming that you created the vector file and converted to raster correctly,
r.mask should work just fine.
In r.mask create a new mask. To each category that you wish to stay
"visible" give a value of one. To all categories you wish to disappear
give a value of 0.
It doesn't really matter how many categories the raster file has that you
use to mask. The MASK will have only two visible (included in the mask)
and invisible (not included in the mask).