Add or get properties

Add or get properties

Usage

properties_add(x, ..., .list = NULL)

properties_get(x, property)

Arguments

x

An object of class geojson

...

Properties to be added, supports NSE as well as SE

.list

a named list of properties to add. must be named

property

(character) property name

References

https://geojson.org/geojson-spec.html

Examples

# add properties
x <- '{ "type": "LineString", "coordinates": [ [100.0, 0.0], [101.0, 1.0] ]}'
(y <- linestring(x))
#> <LineString> 
#>   coordinates:  [[100,0],[101,1]] 
y %>% feature() %>% properties_add(population = 1000)
#> <Feature> 
#>   type:  LineString 
#>   coordinates:  [[100,0],[101,1]] 

## add with a named list already created
x <- '{ "type": "LineString", "coordinates": [ [100.0, 0.0], [101.0, 1.0] ]}'
(y <- linestring(x))
#> <LineString> 
#>   coordinates:  [[100,0],[101,1]] 
props <- list(population = 1000, temperature = 89, size = 5)
y %>% feature() %>% properties_add(.list = props)
#> <Feature> 
#>   type:  LineString 
#>   coordinates:  [[100,0],[101,1]] 

## combination of NSE and .list
x <- '{ "type": "LineString", "coordinates": [ [100.0, 0.0], [101.0, 1.0] ]}'
(y <- linestring(x))
#> <LineString> 
#>   coordinates:  [[100,0],[101,1]] 
props <- list(population = 1000, temperature = 89, size = 5)
y %>% feature() %>% properties_add(stuff = 4, .list = props)
#> <Feature> 
#>   type:  LineString 
#>   coordinates:  [[100,0],[101,1]] 

# features to featurecollection
x <- '{ "type": "Point", "coordinates": [100.0, 0.0] }'
point(x) %>%
  feature() %>%
  featurecollection() %>%
  properties_add(population = 10)
#> <FeatureCollection> 
#>   type:  FeatureCollection 
#>   no. features:  1 
#>   features (1st 5):  Point 

# get property
x <- '{ "type": "LineString", "coordinates": [ [100.0, 0.0], [101.0, 1.0] ]}'
(y <- linestring(x))
#> <LineString> 
#>   coordinates:  [[100,0],[101,1]] 
x <- y %>% feature() %>% properties_add(population = 1000)
properties_get(x, property = 'population')
#> 1000