calc_zoom function

Calculate a zoom given a bounding box

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.

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)

See Also

make_bbox(), bb2bbox()