Add a feature to an Overpass query
Add a feature to an Overpass query
add_osm_feature( opq, key, value, key_exact = TRUE, value_exact = TRUE, match_case = TRUE, bbox = NULL )
opq |
An |
key |
feature key |
value |
value for feature key; can be negated with an initial
exclamation mark, |
key_exact |
If FALSE, |
value_exact |
If FALSE, |
match_case |
If FALSE, matching for both |
bbox |
optional bounding box for the feature query; must be set if no opq query bbox has been set |
opq object
add_osm_feature vs add_osm_features
Features defined within an add_osm_features call are combined with a logical OR.
Chained calls to either add_osm_feature or add_osm_features() combines
features from these calls in a logical AND; this is analagous to chaining
dplyr::filter() on a data frame.
add_osm_features() with only one feature is logically equivalent to
add_osm_feature().
key_exact should generally be TRUE, because OSM uses a
reasonably well defined set of possible keys, as returned by
available_features. Setting key_exact = FALSE allows matching
of regular expressions on OSM keys, as described in Section 6.1.5 of
https://wiki.openstreetmap.org/wiki/Overpass_API/Overpass_QL. The actual
query submitted to the overpass API can be obtained from
opq_string.
Other queries:
add_osm_features(),
bbox_to_string(),
getbb(),
opq_around(),
opq_enclosing(),
opq_osm_id(),
opq_string(),
opq(),
overpass_status()
## Not run:
q <- opq ("portsmouth usa") %>%
add_osm_feature (
key = "amenity",
value = "restaurant"
) %>%
add_osm_feature (key = "amenity", value = "pub")
osmdata_sf (q) # all objects that are restaurants AND pubs (there are none!)
q1 <- opq ("portsmouth usa") %>%
add_osm_feature (
key = "amenity",
value = "restaurant"
)
q2 <- opq ("portsmouth usa") %>%
add_osm_feature (key = "amenity", value = "pub")
c (osmdata_sf (q1), osmdata_sf (q2)) # all restaurants OR pubs
# Use of negation to extract all non-primary highways
q <- opq ("portsmouth uk") %>%
add_osm_feature (key = "highway", value = "!primary")
## End(Not run)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.