crop_shape: Crop shape object

In tmaptools: Thematic Map Tools

Crop shape object

Description

Crop a shape object (from class sf, stars, sp, or raster). A shape file x is cropped, either by the bounding box of another shape y, or by y itself if it is a SpatialPolygons object and polygon = TRUE.

Usage

crop_shape(x, y, polygon = FALSE, ...)

Arguments

x	shape object, i.e. an object from class sf, stars, sp, or raster.
y	bounding box, an st_bbox, extent (raster package), or a shape object from which the bounding box is extracted (unless polygon is TRUE and x is an sf object).
polygon	should x be cropped by the polygon defined by y? If FALSE (default), x is cropped by the bounding box of x. Polygon cropping only works when x is a spatial object and y is a SpatialPolygons object.
...	not used anymore

Details

This function is similar to crop from the raster package. The main difference is that crop_shape also allows to crop using a polygon instead of a rectangle.

Value

cropped shape, in the same class as x

See Also

bb

Examples

if (require(tmap) && packageVersion("tmap") >= "3.99") {
    data(World, NLD_muni, land, metro)

    #land_NLD <- crop_shape(land, NLD_muni)

    #qtm(land_NLD, raster="trees", style="natural")

    metro_Europe <- crop_shape(metro, World[World$continent == "Europe", ], polygon = TRUE)

    qtm(World) +
    tm_shape(metro_Europe) +
    	tm_bubbles("pop2010",
    	           col="red",
    	           size.legend = tm_legend("European cities")) +
    	tm_legend(frame=TRUE)
}

tmaptools documentation built on April 4, 2025, 2:02 a.m.