Find WFS services in the Geoportal catalogue — find

Searches the GeoNetwork catalogue read by read_metadata_all() for records that offer a download service, and returns one row per matching WFS link. The service column of the result is what read_wfs() takes as its first argument.

Usage

find_wfs(pattern = NULL, metadata = NULL, protocol = "OGC:WFS", ...)

Arguments

pattern: regular expression matched, case-insensitively, against the record title, its abstract and the link URL. NULL (default) returns every WFS link.
metadata: result of a previous read_metadata_all() call. Pass this to search repeatedly without downloading the catalogue again. If NULL (default) the catalogue is read.
protocol: link protocol to keep (default: "OGC:WFS"). Pass "OGC:WMS" to find map services instead, or NULL for all of them.
...: further arguments passed to read_metadata_all(), e.g. base_url.

Value

tibble with columns title, service, link_url, link_desc, link_protocol, geonet_uuid, sorted by title. Warns, and returns no rows, when metadata holds no links at all or none of them uses protocol – both of which are a different thing from pattern not matching. The second warning names the protocols that are on offer.

Details

This answers "which endpoint belongs to dataset X". It is a convenience for discovery: once the service name is known it should be written down in the calling code, so that fetching the data no longer depends on the catalogue being reachable.

Examples

if (FALSE) { # \dontrun{
catalogue <- read_metadata_all()
find_wfs("kanalisation", metadata = catalogue)
find_wfs("alkis", metadata = catalogue)
} # }