Two Questions (r.support(?) and v.out.arc)

[Tom Orth]

>> Back to manual editing, then: the information obtained from r.support is 
>> stored in $LOCATION/cellhd/[mapname]. I don't really understand what you 
>> mean by default rows and columns: the default settings are stored in a 
>> file called $LOCATION/DEFAULT_WIND, but I am under the impression that 
>> this file is only valid inside mapset PERMANENT. Changing the # of rows 
>> and columns directly with r.support is only useful if you have incomplete 
>> raster files, otherwise g.region will do everything you want.

Ok, thanks.  I was under the impression you could change the map resolution
and screen resolution independently.  

>> >    2./ We have a mapset whose overlay is 15135 polygons within GRASS. When
>> >        we use "v.out.arc type=polygon vect=overlay arc_prefix=overlay, it
>> >        generates overlay.* files which have 23400 polygons.  Is there a 
>> >        reason for this, or is v.out.arc broken ?
>> I seem to recall that ARC never accepted lines with more than 500 
>> vertices, so every line that is longer will be broken into segments.

Ok, but that doesn't explain why I end up with .lab file which has almost
10k *more* polygons than the data I started with. I can accept that the .pol 
file utilizes more segments, but this shouldn't affect the final polygon count.

        T.



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Thomas Orth, M.Sc.                              Alberta Research Council
Research Officer                                3rd Floor, 6815 8th Street N.E.
Advanced Computing & Engineering                Calgary, Alberta T2E 7H7       
Spatial Information Management and Analysis     Canada                         
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Email:              Phone:             Fax:                WWW:                
orth at arc.ab.ca      (403) 297-7571     (403) 297-2339      http://www.arc.ab.ca
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    I'd be really surprised if my opinions reflected those of my employers.    
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