Novice: Contours from GIF
cameron at ogg.stl.dec.com
Thu Sep 18 04:06:28 EDT 1997
I've scanned most carefully a portion of a topographic map, ensuring
that each pixel matches my resolution of five metres. So my GIF file is
600 x 800 pixels, 3km by 4km.
I've been able to import it using r.in.gif and then adjust it's location
using r.support. Displaying it actually worked too, with d.rast.
1) how do I make the display show only one portion of the area and
magnify it to show the original level of detail? Or better?
2) how do I now digitise the GIF to produce a vector map of the
contours? And a site map of some of the features?
James Cameron (cameron at stl.dec.com)
Digital Equipment Corporation (Australia) Pty. Ltd. A.C.N. 000 446 800
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