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Read all GeoNetwork / Geoportal metadata in chunks

Source: R/read_metadata_all.R
read_metadata_all.Rd

This function uses read_metadata() repeatedly to fetch all available metadata records from a GeoNetwork endpoint that supports from / to pagination (like the GDI Berlin instance).

Usage

read_metadata_all(
  base_url =
    "https://gdi.berlin.de/geonetwork/srv/ger/q?facet.q=type/service&resultType=details&sortBy=changeDate&fast=index",
  chunk_size = 100
)

Arguments

base_url

Base GeoNetwork query URL without from and to parameters. Must return an XML with a <summary count="..."> node. Defaults to the GDI Berlin service search.

chunk_size

Number of records per request. Default: 100.

Value

A tibble with one row per metadata record, identical in structure to the return value of read_metadata(), but for all pages.

Details

It first downloads the initial XML, reads the <summary count="..."> attribute to know how many records exist, then iterates in chunks (default: 100) until all records are read.

See also

read_metadata()

Examples

if (FALSE) { # \dontrun{
all_md <- read_metadata_all()
nrow(all_md)
} # }