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#' @title Create a new tile provider
#' @description
#' Use this function to create new tiles provider.
#'
#' @param name name of the provider.
#' @param url url of the provider.
#' The url must contain \{x\}, \{y\} and \{z\} placeholders. It may also contain
#' \{s\} for sub-domains or \{apikey\} for API keys (see Examples).
#' @param sub sub-domains.
#' @param citation attribution text of the provider.
#'
#' @return a list is returned. This list can be used by \link{get_tiles}.
#' @export
#' @examples
#' statdia_toner <- create_provider(
#' name = "stadia_stamen_toner",
#' url = "https://tiles.stadiamaps.com/tiles/stamen_toner/{z}/{x}/{y}.png?api_key={apikey}",
#' citation = "© Stadia Maps © Stamen Design © OpenMapTiles © OpenStreetMap contributors"
#' )
#' opentopomap <- create_provider(
#' name = "otm",
#' url = "https://{s}.tile.opentopomap.org/{z}/{x}/{y}.png",
#' sub = c("a", "b", "c"),
#' citation = "map data: © OpenStreetMap contributors, SRTM | map style: © OpenTopoMap (CC-BY-SA)"
#' )
#' IGN <- create_provider(
#' name = "orthophoto_IGN",
#' url = paste0(
#' "https://wxs.ign.fr/ortho/geoportail/wmts?",
#' "&REQUEST=GetTile",
#' "&SERVICE=WMTS",
#' "&VERSION=1.0.0",
#' "&STYLE=normal",
#' "&TILEMATRIXSET=PM",
#' "&FORMAT=image/jpeg",
#' "&LAYER=ORTHOIMAGERY.ORTHOPHOTOS.BDORTHO",
#' "&TILEMATRIX={z}",
#' "&TILEROW={y}",
#' "&TILECOL={x}"
#' ),
#' citation = "IGN, BD ORTHO®"
#' )
create_provider <- function(name, url, sub = NA, citation) {
return(list(src = name, q = url, sub = sub, cit = citation))
}
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