osmplotr (version 0.1-3)

plot_osm_basemap: plot_osm_basemap

Description

Generates a base OSM plot ready for polygon, line, and point objects to be overlain with add_osm_objects(). NOTE: Graphics files must be closed after finishing map with dev.off() or graphics.off(). Unless specified, height of graphics device is automatically calculated in proportion to the given width according to the aspect ratio of the bounding box.

Usage

plot_osm_basemap(bbox = bbox, filename = NULL, width = 640,
  structures = NULL, bg = "gray20", graphic.device = "png", ...)

Arguments

bbox

bounding box (Latitude-longitude range) to be plotted. A 2-by-2 matrix of 4 elements with columns of min and max values, and rows of x and y values.

filename

Name of plot file; default=NULL plots to screen device (low quality and likely slow)

width

Width of graphics file (in px; default 480).

structures

Data frame returned by osm_structures() used here to specify background colour of plot; if 'structs=NULL', the colour is specified by 'bg'

bg

Background colour of map (default = 'gray20' only if structs not given)

graphic.device

Type of graphic device to print to. For example, 'png' (default), 'jpeg', 'png', or 'tiff'

...

Other parameters to be passed to graphic device (such as width and height; see ?png, for example, for details)

Value

• nothing (generates file of specified type)

Examples

plot_osm_basemap (bbox=get_bbox (c (-0.15, 51.5, -0.1, 51.52)), col="gray20")
add_osm_objects (london$dat_BNR, col="gray40") # non-residential buildings