Hi all I have a big dataset of points and am doing stuff on them that takes a lot of time. To speed it up, I would like to use "thinlines" from RArcinfo, which basically makes the maps "rougher" by throwing away points. Is there an equivalent function for SpatialPolygon type objects? (I assume that there's no way to convert _to_ Arcinfo, though I know it's possible to read from it). Cheers David Hugh-Jones PhD Candidate Essex University Department of Government http://davidhughjones.googlepages.com
thinlines equivalent?
2 messages · David Hugh-Jones, Pinaud David
maybe you can try the function dp() in the package "shapefiles", which is an implementation of the Douglas-Peucker polyLine simplification algorithm. Hope it helps David David Hugh-Jones a ?crit :
Hi all I have a big dataset of points and am doing stuff on them that takes a lot of time. To speed it up, I would like to use "thinlines" from RArcinfo, which basically makes the maps "rougher" by throwing away points. Is there an equivalent function for SpatialPolygon type objects? (I assume that there's no way to convert _to_ Arcinfo, though I know it's possible to read from it). Cheers David Hugh-Jones PhD Candidate Essex University Department of Government http://davidhughjones.googlepages.com
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*************************************************** David PINAUD Ing?nieur de Recherche "Analyses spatiales" Centre d'Etudes Biologiques de Chiz? - CNRS UPR1934 79360 Villiers-en-Bois, France poste 485 Tel: +33 (0)5.49.09.35.58 Fax: +33 (0)5.49.09.65.26 http://www.cebc.cnrs.fr/ *************************************************** ________ -------------- next part -------------- A non-text attachment was scrubbed... Name: pinaud.vcf Type: text/x-vcard Size: 324 bytes Desc: not available URL: <https://stat.ethz.ch/pipermail/r-sig-geo/attachments/20080630/45102c6e/attachment.vcf>