opq: Build an Overpass query

Description

Build an Overpass query

Usage

opq(bbox = NULL, timeout = 25, memsize)

Arguments

bbox

Either (i) four numeric values specifying the maximal and minimal longitudes and latitudes, in the form c(xmin, ymin, xmax, ymax) or (ii) a character string in the form xmin,ymin,xmax,ymax. These will be passed to getbb to be converted to a numerical bounding box. Can also be (iii) a matrix representing a bounding polygon as returned from getbb(..., format_out = "polygon").

timeout

It may be necessary to increase this value for large queries, because the server may time out before all data are delivered.

memsize

The default memory size for the 'overpass' server in bytes; may need to be increased in order to handle large queries.

Value

An overpass_query object

Examples

Run this code

# NOT RUN {
q <- getbb ("portsmouth", display_name_contains = "USA") %>%
            opq () %>% 
            add_osm_feature("amenity", "restaurant") %>%
            add_osm_feature("amenity", "pub") 
osmdata_sf (q) # all objects that are restaurants AND pubs (there are none!)
q1 <- getbb ("portsmouth", display_name_contains = "USA") %>%
                opq () %>% 
                add_osm_feature("amenity", "restaurant") 
q2 <- getbb ("portsmouth", display_name_contains = "USA") %>%
                opq () %>% 
                add_osm_feature("amenity", "pub") 
c (osmdata_sf (q1), osmdata_sf (q2)) # all objects that are restaurants OR pubs
# }

Run the code above in your browser using DataCamp Workspace