R/utils.R

In osmdatar/osmdata: Import 'OpenStreetMap' Data as Simple Features or Spatial Objects

is_datetime <- function (x) {

    ptn <- "^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}[A-Z]$"
    grepl (ptn, x)
}

#' unname_osmdata_sf
#'
#' Remove names from `osmdata` geometry objects, for cases in which these cause
#' issues, particularly with plotting, such as
#' \url{https://github.com/rstudio/leaflet/issues/631}, or
#' \url{https://github.com/r-spatial/sf/issues/1177}. Note that removing these
#' names also removes any ability to inter-relate the different components of an
#' `osmdata` object, so use of this function is only recommended to resolve
#' issues such as those linked to above.
#'
#' @param x An 'osmdata_sf' object returned from function of same name
#' @return Same object, yet with no row names on geometry objects.
#' @family transform
#' @examples
#' \dontrun{
#' hampi_sf <- opq ("hampi india") %>%
#'     add_osm_feature (key = "historic", value = "ruins") %>%
#'     osmdata_sf ()
#' hampi_clean <- unname_osmdata_sf (hampi_sf)
#'
#' # All coordinate matrices include rownames with OSM ID values:
#' head (as.matrix (hampi_sf$osm_lines$geometry [[1]]))
#' # But 'unname_osmdata_sf' removes both row and column names:
#' head (as.matrix (hampi_clean$osm_lines$geometry [[1]]))
#' }
#' @export
unname_osmdata_sf <- function (x) {

    requireNamespace ("sf")

    x <- unname_osm_points (x)
    x <- unname_osm (x, "osm_lines")
    x <- unname_osm (x, "osm_polygons")
    x <- unname_osm (x, "osm_multilines")
    x <- unname_osm (x, "osm_multipolygons")

    return (x)
}

unname_osm_points <- function (x) {

    if (nrow (x$osm_points) > 0) {
        names (x$osm_points$geometry) <- NULL
    }
    return (x)
}

unname_osm <- function (x, what = "osm_lines") {

    if (is.null (x [[what]])) {
        return (x)
    }

    g <- lapply (x [[what]]$geometry, function (i) unname (i))
    names (g) <- NULL

    if (what == "osm_polygons") {

        g <- lapply (g, function (i) {
            rownames (i [[1]]) <- NULL
            return (i) })

    } else if (what == "osm_multilines") {

        g <- lapply (g, function (i) {
            sf::st_multilinestring (lapply (
                i,
                function (j) unname (j)
            ))
        })

    } else if (what == "osm_multipolygons") {

        g <- lapply (g, function (i) {
            sf::st_multipolygon (lapply (i, function (j) unname (j)))
        })
    }

    x [[what]]$geometry <- sf::st_sfc (g, crs = 4326)
    return (x)
}