Newsgroups: info.grass.user
Path: copeland
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: 14
I'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.
On Thu, 14 Oct 1993, Megan Stewart wrote:
Newsgroups: info.grass.user
Path: copeland
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: 14
I'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.
Two ways:
1. Generate the mask from a vector file with
0 for nodata
1 for mask area
and then generate your raster file with v.to.rast
2. Use r.reclass on your current raster file that you want to use and set all
of the categories that you want included in your mask to 1, and set all of
those that are outside of the mask (Area that will no be visible in the end) to
a 0.
E-mail me privately if you have any trouble.
Take Care,
Craig Miller
GIS Coordinator
Chelan County Conservation District
cmiller@pnwg.wa.com