Description Usage Arguments Details Value Examples
Convert objects to an sf class
1 | geojson_sf(x, stringsAsFactors = FALSE, ...)
|
x |
Object of class |
stringsAsFactors |
Convert strings to Factors? Default |
... |
Further args passed on to |
The type of sf object returned will depend on the input GeoJSON.
Sometimes you will get back a POINTS
class, and sometimes a
POLYGON
class, etc., depending on what the structure of the GeoJSON.
The reading and writing of the CRS to/from geojson is inconsistent. You can
directly set the CRS by passing a valid PROJ4 string or epsg code to the crs
argument in sf::st_read()
An sf class object, see Details.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | ## Not run:
library(sf)
# geo_list ------------------
## From a numeric vector of length 2 to a point
vec <- c(-99.74,32.45)
geojson_list(vec) %>% geojson_sf
## Lists
## From a list
mylist <- list(list(latitude=30, longitude=120, marker="red"),
list(latitude=30, longitude=130, marker="blue"))
geojson_list(mylist) %>% geojson_sf
geojson_list(mylist) %>% geojson_sf %>% plot
## From a list of numeric vectors to a polygon
vecs <- list(c(100.0,0.0), c(101.0,0.0), c(101.0,1.0), c(100.0,1.0), c(100.0,0.0))
geojson_list(vecs, geometry="polygon") %>% geojson_sf
geojson_list(vecs, geometry="polygon") %>% geojson_sf %>% plot
# geo_json ------------------
## from point
geojson_json(c(-99.74,32.45)) %>% geojson_sf
geojson_json(c(-99.74,32.45)) %>% geojson_sf %>% plot
# from featurecollectino of points
geojson_json(us_cities[1:2,], lat='lat', lon='long') %>% geojson_sf
geojson_json(us_cities[1:2,], lat='lat', lon='long') %>% geojson_sf %>% plot
# Set the CRS via the crs argument
geojson_json(us_cities[1:2,], lat='lat', lon='long') %>% geojson_sf(crs = "+init=epsg:4326")
# json ----------------------
x <- geojson_json(us_cities[1:2,], lat='lat', lon='long')
geojson_sf(x)
# character string ----------------------
x <- unclass(geojson_json(c(-99.74,32.45)))
geojson_sf(x)
## End(Not run)
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