digitizing tips

[Jill Schuler]

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I have some questions!.

for example, I have two polygons having a common boundary,
so I'm gonna digitizing these in Autocad R13.
As far as I know, I should digitize the common boundary twice to make
two polygons.

Is it true?

if not, can I get two polygons by digitizing the common boudary just
once?


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Never digitize a common boundary more than once.  Nodes should be inserted 
at the common line for correct topology.  Digitization of a common line twice
will create spurs (small areas between the two feature) and lead to topology 
problems when the feature is imported in a GIS.

..............x................          x=node
.             .               .          .=point
.             .               .
.             .               .
.             .               .
..............x................


Jill
                                                . 
Jill R. Schuler                                / \
USDA                                          /   \
Natural Resource Conservation Service        /.....\/\    /\
2627 Redwing, Suite 120                     /       \_/\_/  \
Ft. Collins, Co 80526                    /\/             _/\ ---------
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FAX: (970) 282-1930                       VCOMM:9010-2418
e-mail: jschuler at itc.nrcs.usda.gov        Phone: (970) 282-2418