Scanning maps and GRASS

At 1:56 PM 9/11/95, Casey Claiborne wrote:

Should I stamp my foot
down and say that I want 300 dpi?

Yes - because more than likely when you are digitising (or analysing)
later you will want to zoom, etc.

The person you are talking to is probably fed up with nongs who
overdo it and blow out file sizes. For GIS applications one must
always consider the necessary precision _on_the_ground_, and what this
translates to in terms of dimensions on the paper map that you are scanning.
So, 5m on a source map at 1:50,000, is represented by 0.1mm or 1/254 of an
inch,
etc etc

Simon Cox

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Dr Simon Cox __ \
CSIRO Exploration & Mining ,~' L_|\ Australian
39 Fairway, PO Box 437, ;-' \ Geodynamics
Nedlands, WA 6009 Australia ( \ Cooperative
      Phone +61 9 284 8443 + ___ / Research
      Fax +61 9 389 1906 L~~' "\__/ Centre
simon@ned.dem.csiro.au W
AGCRC info>> http://www.ned.dem.csiro.au/AGCRC/
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