ArcInfo to Grass conversion

Steven Rose writesL

I've been reading about v.in.arc, but ungenerating all those maps and
rebuilding the topology and then rasterizing on the GRASS side seems
a bit much (perhaps those that have done it could assure me that it
is not too bad, or warn me of watch-out-for's).

No, it's not that bad; you've got the whole weekend, so why don't you
use a shell-script like this that does the importing for you (and make an
AML in ARC of course that does the export bit), that runs 126 sequences
like this (try a test run first, and then let the computer do the
night-shift)

i=1
while [ $i -gt 126 ]
do
  v.in.arc type=polygon lin=forest${i}.lin poi=forest${i}.pnt
text=forest${i}.txt v=forest${i}
   v.support -r forest${i}
  g.region vect=forest${i}
  v.to.rast forest${i} forest${i}
  i=`expr $i + 1`
done

As long as you keep the names of the files sequential, it should work
easily, so the only hard bit will be renaming your ARC files if you
haven't done so.

The other alternative is to use arc/info's POLYGRID command and
output and ASCII file and then use r.in.ascii. Unfortunately, the
file formats aren't quite the same, but I could write code if
required to do the transfer (I'm hoping that somebody has already
done that -- or there is an easier way).

Seems like more programming to me, but you could be right about someone
having hacked his/her way alrady

Thanks for any help you could provide.

(P.S. the computer lab is airconditioned, so I'll have a fun weekend
anyway)

Lucky you, mine isn't....

Professor Steven Rose, R.P.F. Phone: (705) 324-9144
Sir Sandford Fleming College FAX: (705) 878-9312
PO Box 8000, Lindsay, Internet: srose@flemingc.on.ca
Ontario, CANADA K9V 5E6

Philip Verhagen
--

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