bbox_to_wkt {gdalraster}

Convert a bounding box to POLYGON in OGC WKT format

Description

bbox_to_wkt() returns a WKT POLYGON string for the given bounding box. Requires GDAL built with the GEOS library.

Usage

bbox_to_wkt(bbox, extend_x = 0, extend_y = 0)

Arguments

bbox

Numeric vector of length four containing xmin, ymin, xmax, ymax.

extend_x

Numeric scalar. Distance in units of bbox to extend the rectangle in both directions along the x-axis (results in xmin = bbox[1] - extend_x, xmax = bbox[3] + extend_x).

extend_y

Numeric scalar. Distance in units of bbox to extend the rectangle in both directions along the y-axis (results in ymin = bbox[2] - extend_y, ymax = bbox[4] + extend_y).

Value

Character string for an OGC WKT polygon. NA is returned if GDAL was built without the GEOS library.

See Also

bbox_from_wkt(), g_buffer()

Examples

elev_file <- system.file("extdata/storml_elev.tif", package="gdalraster")
ds <- new(GDALRaster, elev_file, read_only=TRUE)
bbox_to_wkt(ds$bbox())
ds$close()