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#' Metadata for references available in GIFT
#'
#' Retrieve the metadata of every reference accessible in GIFT.
#'
#' @template GIFT_version_api
#'
#' @return
#' A data frame with 14 columns.
#'
#' @details Here is what each column refers to:
#'
#' \emph{ref_ID} - Identification number of the reference\cr
#' \emph{ref_long} - Full reference for the reference\cr
#' \emph{geo_entity_ref} - Name of the location\cr
#' \emph{type} - What type the source is\cr
#' \emph{subset} - What information regarding the status of species is
#' available\cr
#' \emph{taxon_ID} - Identification number of the group of taxa available\cr
#' \emph{taxon_name} - Name of the group of taxa available\cr
#' \emph{checklist} - Is the source a checklist\cr
#' \emph{native_indicated} - Whether native status of species is available in
#' the source\cr
#' \emph{natural_indicated} - Whether naturalized status of species is
#' available in the source\cr
#' \emph{end_ref} - Whether endemism information is available in the source\cr
#' \emph{traits} - Whether trait information is available in the source\cr
#' \emph{restricted} - Whether the access to this reference is restricted\cr
#' \emph{proc_date} - When the source was processed
#'
#' @references
#' Denelle, P., Weigelt, P., & Kreft, H. (2023). GIFT—An R package to
#' access the Global Inventory of Floras and Traits. Methods in Ecology
#' and Evolution, 14, 2738-2748.
#' https://doi.org/10.1111/2041-210X.14213
#'
#' Weigelt, P, König, C, Kreft, H. GIFT – A Global Inventory of Floras and
#' Traits for macroecology and biogeography. J Biogeogr. 2020; 47: 16– 43.
#' https://doi.org/10.1111/jbi.13623
#'
#' @seealso [GIFT::GIFT_checklists()]
#'
#' @examples
#' \donttest{
#' ex <- GIFT_references()
#' }
#'
#' @importFrom jsonlite read_json
#' @importFrom dplyr mutate_at
#'
#' @export
GIFT_references <- function(
api = "https://gift.uni-goettingen.de/api/extended/",
GIFT_version = "latest"){
api_check <- check_api(api)
if(is.null(api_check)){
return(NULL)
} else{
GIFT_version <- check_gift_version(GIFT_version)
tmp <- jsonlite::read_json(paste0(
api, "index", ifelse(GIFT_version == "beta", "", GIFT_version),
".php?query=references"), simplifyVector = TRUE)
tmp <- dplyr::mutate_at(
tmp, c("ref_ID","taxon_ID","checklist","native_indicated",
"natural_indicated","end_ref","traits"), as.numeric)
if("restricted" %in% names(tmp)){
tmp$restricted <- as.numeric(tmp$restricted)
}
return(tmp)
}
}
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