Flexible function to generate bounding boxes
Takes a geographic object or bounding box as an input and outputs a bounding box, represented as a bounding box, corner points or rectangular polygon.
geo_bb(
shp,
scale_factor = 1,
distance = 0,
output = c("polygon", "points", "bb")
)shp |
Spatial object (from sf or sp packages) |
scale_factor |
Numeric vector determining how much the bounding box will grow or shrink. Two numbers refer to extending the bounding box in x and y dimensions, respectively. If the value is 1, the output size will be the same as the input. |
distance |
Distance in metres to extend the bounding box by |
output |
Type of object returned (polygon by default) |
bb_scale
Other geo:
bbox_scale(),
gclip(),
geo_bb_matrix(),
mapshape_available(),
mapshape(),
quadrant(),
reproject()
# Simple features implementation: shp <- routes_fast_sf shp_bb <- geo_bb(shp, distance = 100) plot(shp_bb, col = "red", reset = FALSE) plot(geo_bb(routes_fast_sf, scale_factor = 0.8), col = "green", add = TRUE) plot(geo_bb(routes_fast_sf, output = "points"), add = TRUE) plot(routes_fast_sf$geometry, add = TRUE)
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