Telecharger les dalles lidarHD dans une zone d'interet

Selectionne les dalles qui intersectent une region d'interet, ou celles dans les blocs specifies. Propose de les telecharger si elles ne sont pas deja dans un repertoire indique par l'utilisateur, un sous-dossier est cree par bloc. Les fichiers sont deja indexes (format copc). Un objet cata au format LAScatalog-class est sauvegarde dans chaque sous-dossier bloc, fichier cata.rda. Un objet cata pour l'ensemble des blocs est sauvegarde a la racine du dossier.

Utilisation

download_files(ta, roi = NULL, folder = NULL, buffer = TRUE, prompt = TRUE)

Arguments

ta

sf object. Tiles available from IGN (output of load_classified_ta

roi

sf object or character vector. Region of interest if sf object, "blocs" of interest if character vector

folder

text. Local folder for laz files. Already downloaded files should not have their names changed. They are placed in sub-directories corresponding to blocs.

buffer

boolean. Should tiles adjacent to tiles intersecting the roi be downloaded to avoid edge artefacts in further processing ?

prompt

boolean. Should the user be prompted before plotting and downloading ?

Valeur de retour

The input object with an additional attribute containing a text string indicated if tiles are in (dedans) or out (dehors) of roi, and if they are already in the target folder done (fait) or todo (a_faire)). This information is not updated in case the user asks for tiles to be downloaded.

Voir également

load_classified_ta to download available tiles, check_folder to check that the structure of the folder which contains downloaded files is correct

Exemples

if (FALSE) { # \dontrun{
ta <- load_classified_ta()
download_files(ta, folder = "./LidarHD/data/LAZ_classe/")
} # }