[R-sig-Geo] st_intersection produce Geometry type: GEOMETRY instead of Geometry type: POLYGON

[Manuel Spínola]

Thank you very much Marcelino.

That works.

I also find that this works (with terra):

g_25000_c <- crop(vect(g_25000), vect(g_50000_d))

g_25000_c <- st_as_sf(g_25000_c)


El vie, 10 feb 2023 a las 15:06, Marcelino de la Cruz Rot (<
marcelino.delacruz using urjc.es>) escribió:

>
> g_25000_c_polygons_only <- g_25000_c[st_is(x = g_25000_c, type =
> "POLYGON"),] # with a comma
>
>
> El 10/02/2023 a las 21:33, Manuel Spínola escribió:
> > Thnak you very much Bede-Fazekas.
> >
> > I got the following error:
> >
> > g_25000_c_polygons_only <- g_25000_c[st_is(x = g_25000_c, type =
> "POLYGON")]
> >
> > Error in `[.data.frame`(x, i) : undefined columns selected
> >
> > El vie, 10 feb 2023 a las 11:53, Bede-Fazekas Ákos (<
> bfalevlist using gmail.com>)
> > escribió:
> >
> >> Dear Manuel,
> >>
> >> technically, the result of st_intersection(x, y), where both x and y are
> >> POLYGONs, can be POINT, LINESTRING, POLGYON and GEOMETRY as well. The
> >> result is GEOMETRY if the type of the different features is not the same
> >> (e.g. POLYGON+POINT).
> >> You can subset the result in this way:
> >> g_25000_c_polygons_only <- g_25000_c[st_is(x = g_25000_c, type =
> >> "POLYGON")]
> >>
> >> HTH,
> >> Ákos
> >> ___________
> >> Ákos Bede-Fazekas
> >> Centre for Ecological Research, Hungary
> >>
> >> 2023.02.10. 18:32 keltezéssel, Manuel Spínola írta:
> >>> Dear list members,
> >>>
> >>> I am trying to "crop" a polygon (grid) with a polygon, but the result
> is
> >> an
> >>> sf object Geometry type: GEOMETRY, instead of an sf object Geometry
> type:
> >>> POLYGON.
> >>>
> >>> How can I obtain an sf POLYGON?
> >>>
> >>> nc = st_read(system.file("shape/nc.shp", package="sf"))
> >>>
> >>>
> >>>
> >>> nc <- st_transform(nc, 3857)
> >>>
> >>>
> >>>
> >>> g_50000 <- st_make_grid(nc, cellsize = 50000) |> st_as_sf()
> >>>
> >>>
> >>>
> >>> g_50000 <- g_50000[nc, ]
> >>>
> >>>
> >>>
> >>> g_50000_d <- st_union(g_50000)
> >>>
> >>>
> >>>
> >>> g_25000 = st_make_grid(g_50000_d, cellsize = 25000) |> st_as_sf()
> >>>
> >>>
> >>>
> >>> g_25000 # Geometry type: POLYGON
> >>>
> >>>
> >>>
> >>> g_25000_c <- st_intersection(g_25000, g_50000_d)
> >>>
> >>>
> >>>
> >>> g_25000_c # Geometry type: GEOMETRY
> >>>
> >>>
> >>>
> >>>
> >> _______________________________________________
> >> R-sig-Geo mailing list
> >> R-sig-Geo using r-project.org
> >> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
> >>
> >
>
> --
> Marcelino de la Cruz Rot
> Coordinador funcional de Biología
> Depto. de Biología y Geología
> Física y Química Inorgánica
> Universidad Rey Juan Carlos
> Móstoles España
>
> _______________________________________________
> R-sig-Geo mailing list
> R-sig-Geo using r-project.org
> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>


-- 
*Manuel Spínola, Ph.D.*
Instituto Internacional en Conservación y Manejo de Vida Silvestre
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