tmaptools (version 1.2)

crop_shape: Crop shape object

Description

Crop a shape object (from class Spatial, Raster, or sf). 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 Spatial-class, Raster, or sf.

y

bounding box (2 by 2 matrix), an extent, or a shape object from which the bounding box is extracted (unless polygon is TRUE and x is a SpatialPolygons 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.

...

arguments passed on to crop

Value

cropped shape, in the same class as x

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.

See Also

bb

Examples

if (require(tmap)) {
    data(Europe, land, metro)

    land_europe <- crop_shape(land, Europe)

    qtm(land_europe, raster="trees", style="natural")

    metro_europe <- crop_shape(metro, Europe, polygon = TRUE)

    qtm(Europe) +
    tm_shape(metro_europe) +
    	tm_bubbles("pop2010", col="red", title.size="European cities") +
    	tm_legend(frame=TRUE)
}