Combine two polygons
On Fri, 28 Apr 2023, Michael Sumner wrote:
fwiw, a method with geodata/terra
cyp <- geodata::gadm(country = c("CYP", "XNC"), path = tempdir(), version =
"3.6")
terra::aggregate(cyp)
and as per https://github.com/r-spatial/evolution/blob/main/pkgapi_230305_refs.csv.
see ?terra::writeVector to write it out (rgdal is very old and you should abandon it, it will be removed from support by the end of this year)
Thank you! Yes, sp will by default switch to using sf in place of rgdal for creating "CRS" objects, and under sp::spTransform in June, and all three retiring packages rgdal, rgeos, and maptools will be gone by October 2023. An sp release will appear in May with a transition guide. It seems that terra does not have an object corresponding to sp's "CRS" or sf's "crs". As far as I can see, one needs to create an empty SpatVector/SpatRaster object and assign a CRS, coerce to "Spatial", and extract its slot. If this makes sense, sp could use terra (and raster, needed for coercion) rather than sf where workflows did not otherwise use sf. Very grateful for input here or https://github.com/r-spatial/evolution/issues. Roger
(just as an aside, we can't hit the geodata vector urls directly with gdal as we can with the rasters, as they are in an R specific format) Cheers, Mike On Fri, Apr 28, 2023 at 10:52?AM Ben Tupper <btupper at bigelow.org> wrote:
Hi, You might try st_union() from the sf package https://r-spatial.github.io/sf/articles/sf3.html#geometrical-operations On Thu, Apr 27, 2023 at 5:37?PM Miluji Sb <milujisb at gmail.com> wrote:
Dear all, I am using the country-level shapefile from GADM. I would like to merge Cyprus and North Cyprus into one polygon. Is this possible? I am using rgdal to read the shapefile, subset, and then rewrite it. Any help will
be
highly appreciated.
##
world <- readOGR("~/gadm36_levels_shp", layer = "gadm36_0")
Best regards,
Milu
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Roger Bivand Emeritus Professor Department of Economics, Norwegian School of Economics, Postboks 3490 Ytre Sandviken, 5045 Bergen, Norway. e-mail: Roger.Bivand at nhh.no https://orcid.org/0000-0003-2392-6140 https://scholar.google.no/citations?user=AWeghB0AAAAJ&hl=en