R: Dimension, simplicity, validity or is_empty queries on simple...

geos_query {sf} | R Documentation

## Dimension, simplicity, validity or is_empty queries on simple feature geometries

### Description

Dimension, simplicity, validity or is_empty queries on simple feature geometries

### Usage

    st_dimension(x, NA_if_empty = TRUE)

    st_is_simple(x)

    st_is_empty(x)

### Arguments

`x` | object of class `sf`, `sfc` or `sfg`
`NA_if_empty` | logical; if TRUE, return NA for empty geometries

### Value

st_dimension returns a numeric vector with 0 for points, 1 for lines, 2 for surfaces, and, if `NA_if_empty` is `TRUE`, `NA` for empty geometries.

st_is_simple returns a logical vector, indicating for each geometry whether it is simple (e.g., not self-intersecting)

st_is_empty returns for each geometry whether it is empty

### Examples

    x = st_sfc(
    	st_point(0:1),
    	st_linestring(rbind(c(0,0),c(1,1))),
    	st_polygon(list(rbind(c(0,0),c(1,0),c(0,1),c(0,0)))),
    	st_multipoint(),
    	st_linestring(),
    	st_geometrycollection())
    st_dimension(x)
    st_dimension(x, FALSE)
    ls = st_linestring(rbind(c(0,0), c(1,1), c(1,0), c(0,1)))
    st_is_simple(st_sfc(ls, st_point(c(0,0))))
    ls = st_linestring(rbind(c(0,0), c(1,1), c(1,0), c(0,1)))
    st_is_empty(st_sfc(ls, st_point(), st_linestring()))

[Package sf version 1.0-7 Index]