ruut/R/gpkg_teisendame_polygoone.R

#' Piirkonnale andmebaasides olevate polügoonide teisendamine
#'
#' Etteantud piirkonna geomeetrilise piirjoone ('piir') ja selle joone piirikasti ('bb') järele leitakse nende aladega kaetud polügoonid. Andmed salvestatakse GPKG faili kihtidena.
#'
#' @param obj str Objekti nimi. Edaspidi on oluline ainult see nimi. Piirkonna geomeetrilist joont ei ole vaja lisada.
#' @param gpkg_home path Salvestatavate GPKG faili asukoht.
#' @return Uute GPKG andmebaasi kihtide 'piir_...' ja 'bb_...' loomine.
#' @seealso [sf::st_read()], [sf::write_sf()],[sf::st_transform()],[ruut::gpkg_piirkonnale_ruudustike_lisamine()] ,[ruut::gpkg_piirkonnale_polygoonide_lisamine()],[ruut::gpkg_sellest_alustame_gpkg_loomist()],[ruut::gpkg_piirkonnale_joonte_lisamine()],[ruut::gpkg_piirkonnale_punktide_lisamine()],[ruut::gpkg_teisendame_polygoone()],[ruut::gpkg_teisendame_jooni()],[ruut::gpkg_teisendame_punkte()]
#' @keywords GPKG, boundary box, EPSG:3301
#' @export
#' @examples
#' \dontrun{
#'
#' gpkg_home <- "/tmp"
#' obj <- "marja"
#' gpkg_teisendame_polygoone(obj = obj, gpkg_home = gpkg_home)
#'
#' # Layers list.
#' dsn <- sprintf("%s/%s.gpkg", gpkg_home, obj)
#' sf::st_layers(dsn = dsn)
#' }
gpkg_teisendame_polygoone <- function(obj = NULL, gpkg_home = "/tmp") {
  dsn <- sprintf("%s/%s.gpkg", gpkg_home, obj)
  if (!file.exists(dsn)) {
    cat(sprintf("\nSellist faili \"%s\" ei leitud.\n", dsn))
    return(NULL)
  }
  ## Konfiguratsiooni muutujale väärtuste omistamine
  conf <- ruut::get_config()
  tmp_gpkg_file <- tempfile(fileext = ".gpkg")
  conf$gpkg_home <- dirname(tmp_gpkg_file)
  conf$gpkg_file <- gsub(paste0(conf$gpkg_home, "/"), "", tmp_gpkg_file)
  conf$gpkg_file <- gsub(".gpkg", "", conf$gpkg_file)

  conf$gpkg_home <- gpkg_home
  conf$gpkg_file <- obj
  tmp_gpkg_file_output <- ruut::construct_to_gpkg_output_file_str(conf = conf, is_input_str = F)
  tmp_gpkg_file_input <- ruut::construct_to_gpkg_output_file_str(conf = conf, is_input_str = T)

  ## ====================== teisendused =====================
  # Layers list
  gpkg_info <- sf::st_layers(dsn = dsn)
  layer_names <- gpkg_info$name
  layer_names <- layer_names[!layer_names %in% c("bb2", "bb2_epk10t_grid", "bb2_epk02t_grid", "bb2_epk2t_grid")] # c("bb", "bb2", "bb_epk10t_grid", "bb_epk02t_grid", "bb_epk2t_grid", "bb_epk10t", "bb_epk02t")]
  for (layer_name in layer_names) {
    ruumiline_obj <- sf::read_sf(dsn = dsn, layer = layer_name)
    ## Kontlrollime kas geomeetriline objekt on polügoon.
    ## Arvutame sel juhul pindala.
    is_polygon <- any(grepl("polygon", tolower(attributes(ruumiline_obj$geom)$class), fixed = TRUE))
    if (is_polygon) {
      ## Lõikame objekti ruudistikga tükkideks. Ühte ruutu võib jääda mitu tükki.
      ## Peame need pärast ühendama
      # ruut::qgis_algorithm_search_by_word("Intersection")
      algorithm <- "native:intersection"
      conf$gpkg_table <- sprintf("%s", layer_name)
      input <- ruut::construct_to_gpkg_output_file_str(conf = conf, geometry_field = "geom", is_input_str = T)
      conf$gpkg_table <- sprintf("%s", "test_layer")
      output <- ruut::construct_to_gpkg_output_file_str(conf = conf, geometry_field = "geom", is_input_str = F)
      conf$gpkg_table <- sprintf("%s", "bb2_epk02t_grid")
      overlay <- ruut::construct_to_gpkg_output_file_str(conf = conf, geometry_field = "geom", is_input_str = T)
      str <- sprintf("{ 'INPUT' : '%s', 'INPUT_FIELDS' : ['fid'], 'OUTPUT' : '%s', 'OVERLAY' : '%s', 'OVERLAY_FIELDS' : [], 'OVERLAY_FIELDS_PREFIX' : '' }", input, output, overlay)
      cmd <- ruut::construct_qgis_output_result_to_better_format(str = str, algorithm = algorithm)
      system(cmd)
      ## Ühendame ruudus olevad pinnad
      # ruut::qgis_algorithm_search_by_word("Dissolve")
      algorithm <- "native:dissolve"
      conf$gpkg_table <- sprintf("%s", "test_layer")
      input <- ruut::construct_to_gpkg_output_file_str(conf = conf, geometry_field = "geom", is_input_str = T)
      conf$gpkg_table <- sprintf("%s", "test_layer_2")
      output <- ruut::construct_to_gpkg_output_file_str(conf = conf, geometry_field = "geom", is_input_str = F)
      str <- sprintf("{ 'FIELD' : ['%s'], 'INPUT' : '%s', 'OUTPUT' : '%s' }", "id", input, output)
      cmd <- ruut::construct_qgis_output_result_to_better_format(str = str, algorithm = algorithm)
      system(cmd)
      ## Lisame pindade pindalad ja perimeetri
      # ruut::qgis_algorithm_search_by_word("attributes")
      algorithm <- "qgis:exportaddgeometrycolumns"
      conf$gpkg_table <- sprintf("%s", "test_layer_2")
      input <- ruut::construct_to_gpkg_output_file_str(conf = conf, geometry_field = "geom", is_input_str = T)
      conf$gpkg_table <- sprintf("%s", "test_layer")
      output <- ruut::construct_to_gpkg_output_file_str(conf = conf, geometry_field = "geom", is_input_str = F)
      str <- sprintf("{ 'CALC_METHOD' : 0, 'INPUT' : '%s', 'OUTPUT' : '%s' }", input, output)
      cmd <- ruut::construct_qgis_output_result_to_better_format(str = str, algorithm = algorithm)
      system(cmd)
      ## Add field
      ## Arvutame pindala protsendi ruudust
      # ruut::qgis_algorithm_search_by_word("pythonfield")
      algorithm <- "qgis:advancedpythonfieldcalculator"
      conf$gpkg_table <- sprintf("%s", "test_layer")
      input <- ruut::construct_to_gpkg_output_file_str(conf = conf, geometry_field = "geom", is_input_str = T)
      conf$gpkg_table <- sprintf("%s_epk02t", layer_name)
      output <- ruut::construct_to_gpkg_output_file_str(conf = conf, geometry_field = "geom", is_input_str = F)
      str <- sprintf("{ 'FIELD_NAME' : 'area_pc', 'FIELD_TYPE' : 1, 'FIELD_LENGTH' : 4, 'FIELD_PRECISION' : 2, 'GLOBAL' : '', 'FORMULA' : 'value = round($geom.area()/10000,4)', 'INPUT' : '%s', 'OUTPUT' : '%s' }", input, output)
      cmd <- ruut::construct_qgis_output_result_to_better_format(str = str, algorithm = algorithm)
      system(cmd)
    }
  }
  ## Layers list
  sf::st_layers(dsn = dsn)
}