ggmap: calc_zoom – R documentation

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calc_zoom

Calculate a zoom given a bounding box

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

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

Examples

# 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)

ggmap

Spatial Visualization with ggplot2

v3.0.0

GPL-2

Authors

David Kahle [aut, cre] (<https://orcid.org/0000-0002-9999-1558>), Hadley Wickham [aut] (<https://orcid.org/0000-0003-4757-117X>), Scott Jackson [aut], Mikko Korpela [ctb]

Initial release