On Thu, 9 Sep 2010, Barry Rowlingson wrote:
On Thu, Sep 9, 2010 at 3:18 PM, binbin lu <lubinbin...@gmail.com> wrote:
Hi,
Is there a function in any R package to correct arc-node topology of
a network? Similar with the Arcinfo function "Clean (Coverage)".
The GRASS GIS system can do this via v.clean:
http://grass.fbk.eu/gdp/html_grass63/v.clean.html
and there's some R-GRASS interoperability tools (I haven't played
with them much, but others on this list have). I think it would be
easier to do it with GRASS than for someone to implement sliver and
dangle removal in R from scratch.
That said, I do have some code from waaay back that does clean and
build topology for the old-style R 'maps' data format. I've just
recovered it from a backup from 1995 and if I get a chance I might see
if it compiles and play with it. Prospects not good though!
Barry,
Are you thinking of the excellent:
http://www2.research.att.com/areas/stat/doc/93.2.ps
http://www2.research.att.com/areas/stat/doc/95.2.ps
mostly in awk and shellscripts in the second report? Then the building
compiled programs that ship with the source maps package? They are
elegant, but do involve manual editing of text files to remove dangles,
etc. Not a menu in sight!
GRASS may be a way forward, with care.
Roger
Barry
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--
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: roger.biv...@nhh.no
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