rgbif (version 0.7.0)

gbif_bbox2wkt: Convert a bounding box to a Well Known Text polygon, and a WKT to a bounding box

Description

Convert a bounding box to a Well Known Text polygon, and a WKT to a bounding box

Usage

gbif_bbox2wkt(minx = NA, miny = NA, maxx = NA, maxy = NA, bbox = NULL)
gbif_wkt2bbox(wkt = NULL)

Arguments

minx

Minimum x value, or the most western longitude

miny

Minimum y value, or the most southern latitude

maxx

Maximum x value, or the most eastern longitude

maxy

Maximum y value, or the most northern latitude

bbox

A vector of length 4, with the elements: minx, miny, maxx, maxy

wkt

A Well Known Text object.

Value

• gbif_bbox2wkt returns an object of class charactere, a Well Known Text string of the form 'POLYGON((minx miny, maxx miny, maxx maxy, minx maxy, minx miny))'.

  gbif_wkt2bbox returns a numeric vector of length 4, like c(minx, miny, maxx, maxy).

Examples

# Convert a bounding box to a WKT
library("rgeos")

## Pass in a vector of length 4 with all values
mm <- gbif_bbox2wkt(bbox=c(38.4,-125.0,40.9,-121.8))
plot(readWKT(mm))

## Or pass in each value separately
mm <- gbif_bbox2wkt(minx=38.4, miny=-125.0, maxx=40.9, maxy=-121.8)
plot(readWKT(mm))

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# Convert a WKT object to a bounding box
wkt <- "POLYGON((38.4 -125,40.9 -125,40.9 -121.8,38.4 -121.8,38.4 -125))"
gbif_wkt2bbox(wkt)