calc_zoom: Calculate a zoom given a bounding box

Description Usage Arguments See Also Examples

Description

calc_zoom can calculate a zoom based on either (1) a data frame with longitude and latitude variables, (2) a longitude range and latitude range, or (3) a bounding box (bbox specification). The specification for (1) is identical to that of most R functions, for (2) simply put in a longitude range into lon and a latitude range into lat, and for (3) put the bounding box in for the lon argument.

Usage

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calc_zoom(lon, lat, data, adjust = 0, f = 0.05)

Arguments

lon

longitude, see details

lat

latitude, see details

data

(optional) a data frame containing lon and lat as variables

adjust

number to add to the calculated zoom

f

argument to pass to make_bbox

See Also

make_bbox, bb2bbox

Examples

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# From data
calc_zoom(lon, lat, wind)

# From range
lon_range <- extendrange( wind$lon )
lat_range <- extendrange( wind$lat )
calc_zoom(lon_range, lat_range)

# From bounding box
box <- make_bbox(lon, lat, data = crime)
calc_zoom(box)

Example output

Loading required package: ggplot2
[1] 7
[1] 7
[1] 7

ggmap documentation built on May 1, 2019, 8:22 p.m.