Re: [R] writing polygons/segments to shapefiles(.shp) or other A rcGIS compatible file

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Re: [R] writing polygons/segments to shapefiles(.shp) or other A rcGIS compatible file

Benjamin.STABLER@odot.state.or.us

Great!  Thanks for all the hard work.  I am excited to see/use the results.

Benjamin Stabler
Transportation Planning Analysis Unit
Oregon Department of Transportation
555 13th Street NE, Suite 2
Salem, OR 97301  Ph: 503-986-4104


>Message: 3
>Date: Tue, 02 Mar 2004 23:30:36 +0800
>From: "Nicholas Lewin-Koh" <nikko at hailmail.net>
>Subject: Re: [R-sig-Geo] Re: [R] writing polygons/segments to
> shapefiles(.shp)or other A rcGIS compatible file
>To: Roger.Bivand at nhh.no
>Cc: r-sig-geo at stat.math.ethz.ch
>Message-ID: <1078241436.20896.181959738 at webmail.messagingengine.com>
>Content-Type: text/plain; charset="ISO-8859-1"
>
>Hi Roger,
>Just working on it now. Just created an empty shapefile from R
>complete with segmentation fault :)
>debugging it now.
>
>I think the code in shapelib, shprewind, is an example of using
>the shapelib api to do shape checking. I will follow this up further.
>meanwhile i will work on getting something started.
>
>Nicholas
>
>
>
>On Tue, 2 Mar 2004 15:42:39 +0100 (CET), "Roger Bivand"
><Roger.Bivand at nhh.no> said:
>> On Mon, 1 Mar 2004, Nicholas Lewin-Koh wrote:
>>
>> > Hi again,
>> > I took a look at maptools code and shapelib last night. It
>should not be
>> > hard to modify to create and write
>> > shapefiles. I think I never developed it in maptools
>because I never
>> > really thought of R as
>> > being suitable for editing maps. I thought R would be very
>suitable for
>> > designing cartographic dispays for
>> > statistical purposes.
>>
>> I think you are correct in principle, but I can see situations where
>> people want to export subsets of say polygons, lines, or points.
>>
>> >
>> > That said, If I can get it working in an evening or two I
>will submit it
>> > to Roger for inclusion in maptools.
>>
>> That's very generous - if you can make a first attempt at making your
>> code
>> work, that will give us a start. The places where my head ached were
>> whether we need to check shapes for compliance before writing them to
>> file
>> - but maybe shapelib does that - I don't think so? Should we
>just let
>> people write anyway?
>>
>>
>> > Do any of the other geo interfaces in development write
>map formats? Eg
>> > the Rgdal interface?
>> >
>>
>> It should but doesn't - you can (I think) overwrite bands,
>but this is
>> something that needs fixing - for those interested, rgdal is on
>> sourceforge, so checking out under cvs is possible, so that
>improvements
>> and additions can be brought in under control.
>>
>> Roger
>>
>> > Nicholas
>> >
>> > _______________________________________________
>> > R-sig-Geo mailing list
>> > R-sig-Geo at stat.math.ethz.ch
>> > https://www.stat.math.ethz.ch/mailman/listinfo/r-sig-geo
>> >
>>
>> --
>> Roger Bivand
>> Economic Geography Section, Department of Economics,
>Norwegian School of
>> Economics and Business Administration, Breiviksveien 40,
>N-5045 Bergen,
>> Norway. voice: +47 55 95 93 55; fax +47 55 95 93 93
>> e-mail: Roger.Bivand at nhh.no
>>
>>
>
>
>
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>End of R-sig-Geo Digest, Vol 7, Issue 3
>***************************************
>