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esp_get_grid_ESDAC.R
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esp_get_grid_ESDAC.R
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#' Get \CRANpkg{sf} polygons of the national geographic grids provided by ESDAC
#'
#' @description
#' Loads a \CRANpkg{sf} polygon with the geographic grids of Spain as provided
#' by the European Soil Data Centre (ESDAC).
#'
#' @family grids
#'
#' @return A \CRANpkg{sf} polygon
#'
#'
#' @source
#' [EEA reference
#' grid](https://esdac.jrc.ec.europa.eu/content/european-reference-grids).
#'
#' @references
#' - Panagos P., Van Liedekerke M., Jones A., Montanarella L., "European Soil
#' Data Centre: Response to European policy support and public data
#' requirements"; (2012) _Land Use Policy_, 29 (2), pp. 329-338.
#' \doi{10.1016/j.landusepol.2011.07.003}
#' - European Soil Data Centre (ESDAC), esdac.jrc.ec.europa.eu, European
#' Commission, Joint Research Centre.
#'
#' @export
#' @param resolution Resolution of the grid in kms. Could be `1` or `10`.
#'
#' @inheritParams esp_get_grid_EEA
#'
#' @inheritSection esp_get_nuts About caching
#' @examplesIf esp_check_access()
#' \dontrun{
#' grid <- esp_get_grid_ESDAC()
#' esp <- esp_get_country(moveCAN = FALSE)
#'
#' library(ggplot2)
#'
#' ggplot(grid) +
#' geom_sf() +
#' geom_sf(data = esp, color = "grey50", fill = NA) +
#' theme_light() +
#' labs(title = "ESDAC Grid for Spain")
#' }
#'
esp_get_grid_ESDAC <- function(resolution = 10,
update_cache = FALSE,
cache_dir = NULL,
verbose = FALSE) {
# Check grid
res <- as.numeric(resolution)
if (!res %in% c(1, 10)) {
stop(
"resolution should be one of 1, 10"
)
}
cache_dir <- esp_hlp_cachedir(cache_dir)
# Url
if (res == 10) {
url <- paste0(
"https://esdac.jrc.ec.europa.eu/Library/Reference_Grids/",
"Grids/grids_for_single_eu25_countries_etrs_laea_10k.zip"
)
filename <- "grids_for_single_eu25_countries_etrs_laea_10k.zip"
init_grid <- "grid_spain_etrs_laea_10k.shp"
} else {
# nocov start
url <- paste0(
"https://esdac.jrc.ec.europa.eu/Library/Reference_Grids/",
"Grids/grid_spain_etrs_laea_1k.zip"
)
filename <- "grid_spain_etrs_laea_1k.zip"
init_grid <- "grid_spain_etrs_laea_1k.shp"
# nocov end
}
filepath <- file.path(cache_dir, filename)
init_grid <- file.path(cache_dir, init_grid)
localfile <- file.exists(init_grid)
if (verbose) message("Cache dir is ", cache_dir)
if (update_cache || isFALSE(localfile)) {
dwnload <- TRUE
if (verbose) {
message("Downloading file from ", url)
}
if (verbose && update_cache) {
message("\nUpdating cache")
}
} else {
dwnload <- FALSE
if (verbose && isFALSE(update_cache)) {
message("File already available on ", filepath)
}
}
# Downloading
if (dwnload) {
err_dwnload <- try(
download.file(url, filepath, quiet = isFALSE(verbose), mode = "wb"),
silent = TRUE
)
# nocov start
if (inherits(err_dwnload, "try-error")) {
if (verbose) message("Retrying query")
err_dwnload <- try(
download.file(url, filepath, quiet = isFALSE(verbose), mode = "wb"),
silent = TRUE
)
}
# If not then message
if (inherits(err_dwnload, "try-error")) {
message(
"Download failed",
"\n\nurl \n ",
url,
" not reachable.\n\nPlease try with another options. ",
"If you think this ",
"is a bug please consider opening an issue on:",
"\nhttps://github.com/rOpenSpain/mapSpain/issues"
)
stop("\nExecution halted")
# nocov end
} else if (verbose) {
message("Download succesful")
}
if (verbose) message("Unzipping ", filepath, " on ", cache_dir)
unzip(filepath, exdir = cache_dir, overwrite = TRUE)
}
err_onload <- try(
sf::st_read(init_grid, quiet = isFALSE(verbose), stringsAsFactors = FALSE),
silent = TRUE
)
# nocov start
if (inherits(err_onload, "try-error")) {
message(
"File may be corrupt. Please try again using cache = TRUE ",
"and update_cache = TRUE"
)
stop("\nExecution halted")
}
# nocov end
if (verbose) message("File loaded")
return(err_onload)
}