Drop Z and/or M dimensions from feature geometries, resetting classes appropriately
Arguments
- x
object of class
sfg
,sfc
orsf
- ...
ignored
- drop
logical; drop, or (FALSE) add?
- what
character which dimensions to drop or add
Details
Only combinations drop=TRUE
, what = "ZM"
, and drop=FALSE
, what="Z"
are supported so far. In case add=TRUE
, x
should have XY
geometry, and zero values are added for Z
.
Examples
st_zm(st_linestring(matrix(1:32,8)))
#> LINESTRING (1 9, 2 10, 3 11, 4 12, 5 13, 6 14, 7 15, 8 16)
x = st_sfc(st_linestring(matrix(1:32,8)), st_linestring(matrix(1:8,2)))
st_zm(x)
#> Geometry set for 2 features
#> Geometry type: LINESTRING
#> Dimension: XY
#> Bounding box: xmin: 1 ymin: 3 xmax: 8 ymax: 16
#> CRS: NA
#> LINESTRING (1 9, 2 10, 3 11, 4 12, 5 13, 6 14, ...
#> LINESTRING (1 3, 2 4)
a = st_sf(a = 1:2, geom=x)
st_zm(a)
#> Simple feature collection with 2 features and 1 field
#> Geometry type: LINESTRING
#> Dimension: XY
#> Bounding box: xmin: 1 ymin: 3 xmax: 8 ymax: 16
#> CRS: NA
#> a geom
#> 1 1 LINESTRING (1 9, 2 10, 3 11...
#> 2 2 LINESTRING (1 3, 2 4)