get_roads_layer {wdnr.gis} | R Documentation |
Retrieve WDNR's roads spatial layer
Description
A function to retrieve WDNR's roads spatial layers. "layer_type" can be set to "major_roads" or "minor_roads" to query the Major Roads or County and Local Roads respectively. A spatial query can be performed to limit the output of the function by supplying a county name, watershed code, watershed name, or custom sf polygon object. Use the 'watershed_lookup' to find valid watershed codes and names. The "where" argument can be used to run custom SQL queries.
Usage
get_roads_layer(
county = NULL,
watershed_code = NULL,
watershed_name = NULL,
sf_object = NULL,
where = NULL,
layer_type = "all",
...
)
Arguments
county |
A character object specifying a county name |
watershed_code |
A character object specifying the HUC code for a watershed |
watershed_name |
A character object specifying the HUC name for a watershed |
sf_object |
Any sf polygon object |
where |
SQL statement |
layer_type |
"major_roads" or "minor_roads" |
... |
Additional parameters to pass to
|
Value
A sf object of class polylines
Examples
## Not run:
get_roads_layer(county = "washington", layer_type = "major_roads")
get_roads_layer(watershed_code = "07070006", layer_type = "minor_roads")
get_roads_layer(where ="HWY_NUM = '43'",layer_type = "major_roads")
## End(Not run)