Hello. Although geos library package supports "negative" buffering(http://geos.osgeo.org/doxygen/classgeos_1_1operation_1_1buffer_1_1BufferOp.html), any plan to support this function in rgeos's gBuffer? Regards.
Will rgeos support "negative" buffering
3 messages · Edzer Pebesma, Hisaji ONO
AFAICS, rgeos does: require(rgeos) Sr1 = Polygon(cbind(c(2,4,4,1,2),c(2,3,5,4,2))) Srs1 = Polygons(list(Sr1), "s1") SpP = SpatialPolygons(list(Srs1), as.integer(1)) plot(SpP) plot(gBuffer(SpP, width=-0.5), col = 'red', add=TRUE)
On 01/26/2012 12:41 PM, hi_ono2001 at ybb.ne.jp wrote:
Hello. Although geos library package supports "negative" buffering(http://geos.osgeo.org/doxygen/classgeos_1_1operation_1_1buffer_1_1BufferOp.html), any plan to support this function in rgeos's gBuffer? Regards.
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Edzer Pebesma Institute for Geoinformatics (ifgi), University of M?nster Weseler Stra?e 253, 48151 M?nster, Germany. Phone: +49 251 8333081, Fax: +49 251 8339763 http://ifgi.uni-muenster.de http://www.52north.org/geostatistics e.pebesma at wwu.de
Thank you very much. I could check this function for generating buffer of shapefiles. Regards.
--- On Thu, 2012/1/26, Edzer Pebesma <edzer.pebesma at uni-muenster.de> wrote:
AFAICS, rgeos does: require(rgeos) Sr1 = Polygon(cbind(c(2,4,4,1,2),c(2,3,5,4,2))) Srs1 = Polygons(list(Sr1), "s1") SpP = SpatialPolygons(list(Srs1), as.integer(1)) plot(SpP) plot(gBuffer(SpP, width=-0.5), col = 'red', add=TRUE) On 01/26/2012 12:41 PM, hi_ono2001 at ybb.ne.jp wrote:
Hello. ? Although geos library package supports "negative" buffering(http://geos.osgeo.org/doxygen/classgeos_1_1operation_1_1buffer_1_1BufferOp.html), any plan to support this function in rgeos's gBuffer? ???Regards.
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-- Edzer Pebesma Institute for Geoinformatics (ifgi), University of M?nster Weseler Stra?e 253, 48151 M?nster, Germany. Phone: +49 251 8333081, Fax: +49 251 8339763? http://ifgi.uni-muenster.de http://www.52north.org/geostatistics? ? ? e.pebesma at wwu.de
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