bbox: Add or get bounding box

In ropenscilabs/geojson: Classes for 'GeoJSON'

Add or get bounding box

Description

Add or get bounding box

Usage

bbox_add(x, bbox = NULL)

bbox_get(x)

Arguments

x	An object of class geojson
bbox	(numeric) a vector or list of length 4 for a 2D bounding box or length 6 for a 3D bounding box. If NULL, the bounding box is calculated for you

Details

Note that bbox_get outputs the bbox if it exists, but does not calculate it from the geojson. See geo_bbox to calculate a bounding box. Bounding boxes can be 2D or 3D.

Value

• bbox_add: an object of class jqson/character from jqr

• bbox_get: a bounding box, of the form [west, south, east, north] for 2D or of the form [west, south, min-altitude, east, north, max-altitude] for 3D

References

https://datatracker.ietf.org/doc/html/rfc7946#section-5

Examples

# make a polygon
x <- '{ "type": "Polygon",
"coordinates": [
  [ [100.0, 0.0], [101.0, 0.0], [101.0, 1.0], [100.0, 1.0], [100.0, 0.0] ]
  ]
}'
(y <- polygon(x))

# add bbox - without an input, we figure out the 2D bbox for you
y %>% feature() %>% bbox_add()
## 2D bbox
y %>% feature() %>% bbox_add(c(100.0, -10.0, 105.0, 10.0))
## 3D bbox
y %>% feature() %>% bbox_add(c(100.0, -10.0, 3, 105.0, 10.0, 17))

# get bounding box
z <- y %>% feature() %>% bbox_add()
bbox_get(z)

## returns NULL if no bounding box
bbox_get(x)

ropenscilabs/geojson documentation built on Aug. 23, 2023, 7:51 p.m.