I missed it completely. Thank you very much! Hugo Michael Sumner <mdsum...@gmail.com> escreveu no dia segunda, 22/07/2019 à(s) 15:12:
> It has changed it, there's now a mix of POLYGON and MULTIPOLYGON > geometries, but no change in the underlying coordinates. You have to use > the dTolerance argument: > > nrow(st_coordinates(nc)) > [1] 2529 > nrow(st_coordinates(st_cast(nc_simplfy))) > [1] 2529 > nrow(st_coordinates(st_cast(st_simplify(nc, dTolerance = 1000)))) > [1] 1941 > > It still might change the geometry with dTolerance = 0 (the default), in > that case it will remove vertices that are collinear (unnecessarily dense > straight lines, reduce to two-vertex edges). I only learnt that recently. > > HTH > > > > On Mon, Jul 22, 2019 at 8:15 PM Hugo Costa <hugoagco...@gmail.com> wrote: > >> Dear list, >> >> function st_simplify outputs exactly the same geometry as the input. This >> is an example: >> >> library(sf) >> >> nc = st_read(system.file("shape/nc.shp", package="sf")) >> nc <- nc %>% st_transform(3857) >> plot(st_geometry(nc)) >> >> nc_simplfy<-st_simplify(nc) >> plot(st_geometry(nc_simplfy)) >> >> However, I'm quite sure some days ago st_simpliffy was working as >> expected. >> Could it be something wrong in my machine? What am I missing? >> >> > sessionInfo() >> R version 3.5.3 (2019-03-11) >> Platform: x86_64-w64-mingw32/x64 (64-bit) >> Running under: Windows >= 8 x64 (build 9200) >> >> Matrix products: default >> >> locale: >> [1] LC_COLLATE=Portuguese_Portugal.1252 LC_CTYPE=Portuguese_Portugal.1252 >> LC_MONETARY=Portuguese_Portugal.1252 LC_NUMERIC=C >> [5] LC_TIME=Portuguese_Portugal.1252 >> >> attached base packages: >> [1] stats graphics grDevices utils datasets methods base >> >> other attached packages: >> [1] sf_0.7-3 >> >> loaded via a namespace (and not attached): >> [1] compiler_3.5.3 magrittr_1.5 class_7.3-15 DBI_1.0.0 >> tools_3.5.3 units_0.6-2 Rcpp_1.0.1 grid_3.5.3 e1071_1.7-0.1 >> [10] classInt_0.3-1 >> >> [[alternative HTML version deleted]] >> >> _______________________________________________ >> R-sig-Geo mailing list >> R-sig-Geo@r-project.org >> https://stat.ethz.ch/mailman/listinfo/r-sig-geo >> > > > -- > Michael Sumner > Software and Database Engineer > Australian Antarctic Division > Hobart, Australia > e-mail: mdsum...@gmail.com > [[alternative HTML version deleted]] _______________________________________________ R-sig-Geo mailing list R-sig-Geo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo