make_bbox: Compute a bounding box

In dkahle/ggmap: Spatial Visualization with ggplot2

Compute a bounding box

Description

Compute a bounding box for a given longitude / latitude collection.

Usage

make_bbox(lon, lat, data, f = 0.05)

Arguments

lon	longitude
lat	latitude
data	(optional) a data frame containing lon and lat as variables
f	number specifying the fraction by which the range should be extended. if length 2 vector, applies to longitude and then latitude.

Examples

make_bbox(lon, lat, data = crime)
make_bbox(lon, lat, data = crime, f = .20)
make_bbox(lon, lat, data = crime, f = c(.20, .05))

(lon <- sample(crime$lon, 10))
(lat <- sample(crime$lat, 10))
make_bbox(lon, lat)
make_bbox(lon, lat, f = .10) # bigger box

dkahle/ggmap documentation built on March 3, 2024, 8:19 a.m.