bags.md
In mongolmaps: Maps and Administrative Boundaries of Mongolia and Ulaanbaatar

mn_bags() explains how to get bag boundaries

Code
  mn_bags()
Condition
  Error in `mn_bags()`:
  ! Bag boundaries are not openly published, so they are not included.
  i Ask NSO for them (international@nso.mn), then use `mn_bags(path = "bags.gpkg")`.
  i Bag codes and names are available now: `mn_codes("bag")`.
  i Khoroos of Ulaanbaatar are available now: `mn_khoroos()`.

mn_read_bags() rejects bad files

Code
  mn_read_bags("no-such-file.gpkg")
Condition
  Error in `mn_read_bags()`:
  ! Can't find the bag file 'no-such-file.gpkg'.

Code
  mn_read_bags(local_bag_file(shift = TRUE))
Condition
  Error in `mn_read_bags()`:
  ! 17 bags lie outside their soum:
  * 1-r bag, Alagtolgoi (MN840151, Jargalant)
  * 1-r bag, Bodonch (MN840451, Altai)
  * 1-r bag, Bayangol (MN840751, Bulgan)
  * 1-r bag, Nariin gol (MN841051, Buyant)
  * 1-r bag, Bulag (MN841351, Darvi)
  * 1-r bag, Agvash (MN841651, Durgun)
  * 1-r bag, Shiver (MN841951, Duut)
  * 1-r bag, Guvee (MN842251, Zereg)
  * 1-r bag, Takhilt (MN842551, Mankhan)
  * 1-r bag, Alag (MN842851, Munkhkhairkhan)
  * ... and 7 more
  i Check the codes, or skip this check with `check_nesting = FALSE`.

Code
  mn_read_bags(path)
Condition
  Error in `mn_read_bags()`:
  ! Can't find a column of bag codes in '<file>.gpkg'.
  i Bag codes are 7-digit NSO codes ("1830151") or P-codes ("MN830151").
  i Name the column with `code_col`.

Code
  mn_read_bags(path, code_col = "id")
Condition
  Error in `mn_read_bags()`:
  ! 2 values are not known NSO bag codes (column id):
  * 9999999
  * 1234567

mn_bags() refuses ambiguous soum names

Code
  mn_bags(soum = "Jargalant", path = local_bag_file())
Condition
  Error in `mn_bags()`:
  ! Can't resolve `soum`.
  x Jargalant matches Jargalant (MN4149, Tuv); Jargalant (MN6104, Orkhon); Jargalant (MN6440, Bayankhongor); Jargalant (MN6510, Arkhangai); Jargalant (MN6719, Khuvsgul); Jargalant (MN8401, Khovd)
  i Use a code from `mn_codes()`, such as "MN84" for Khovd.

mn_read_bags() needs a path and a coordinate system

Code
  mn_read_bags(NULL)
Condition
  Error in `mn_read_bags()`:
  ! `path` must be a single string.

Code
  mn_read_bags(path)
Condition
  Error in `mn_read_bags()`:
  ! The bag file '<file>.shp' has no usable coordinate reference system.
  i Set one with `sf::st_set_crs()` and save the file again.
  Caused by error:
  ! OGRCreateCoordinateTransformation(): transformation not available