South Korea Maps

This repo hosts South Korea administrative division geodata in open formats that can be used to build static and interactive maps (e.g. with D3), and was inspired by swiss-maps.

To see maps for Seoul, go to https://github.com/southkorea/seoul-maps

Description

Formats

The following formats are available:
shp,
kml/kmz,
svg,
GeoJSON,
TopoJSON,
and RData.

Sources

Data is acquired from the following sources:

KOSTAT: Administrative division geodata for Census (센서스용 행정구역경계), 2011|2012}2013
GADM: Global administrative areas
POPONG: National Assembly Precinct (선거구), Hand-traced (for production)
Wikimedia: Administrative divisions map of South Korea

Levels

South Korean administrative divisions are consisted of three levels:

Provinces (시도): Special City(특별시), Metropolitan City(광역시), Province(도), Special Self-governing Province(특별자치도), Special Self-governing City(특별자치시)
Municipalities (시군구): Si (시, city), Gun (군, county), Gu (구, district)
Submunicipalities (읍면동): Eup (읍, town), Myeon (면, township), Dong (동, neighborhood), Ri (리, village)
Precinct (선거구): 19, 20대 국회 지역구

Data

The following data are available.

Numbers are data sizes in Megabytes in the following order: Country border, Provinces, Municipalities, Submunicipalities.
Numbers in parentheses are simplified versions of each format.

Format \ Source	KOSTAT (2013)	GADM	POPONG	Wikimedia
ESRI Shapefile	0, 9.6, 19, 46	5.5, 5.5, 5.8, 0	0	0
KML/KMZ	0, 0.16, 0.452, 2.8	1.5, 1.5, 1.7, 0	0	0
SVG	0	0	0, 0.014, 0, 0	0, 0, 0.100, 0
GeoJSON	0, 31, 52, 0 (0, 0.148, 0.364, 1.7)	15, 15, 16, 0	0	0
TopoJSON	0, 1.2, 2.0, 4.9 (0, 0.032, 0.0.96, 0.812)	1.5, 1.5, 1.6, 0	0	0
RData	0	1.0, 1.0, 1.2, 0	0	0

Development Notes

Requirements

brew install gdal
npm install -g topojson

KOSTAT (2013)

Download Shapefiles

Projection files are provided here. Otherwise, copy the snippet below and save to a separate prj file having the same name as the shp file.

  PROJCS["Bessel_1841_Transverse_Mercator",GEOGCS["GCS_Bessel_1841",DATUM["D_Bessel_1841",SPHEROID["Bessel_1841",6377397.155,299.1528128]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",200000.0],PARAMETER["False_Northing",500000.0],PARAMETER["Central_Meridian",127.0028902777778],PARAMETER["Scale_Factor",1.0],PARAMETER["Latitude_Of_Origin",38.0],UNIT["Meter",1.0]]

CRS: Korean 1985 / Modified Central, EPSG:5174
Data encoding: EUC-KR

Downloaded dates
- 2011 version: Downloaded on Mar 2013.
- 2012 version: Downloaded on Feb 2015.
- 2013 version: Downloaded on May 2015.

Download and install QGIS. With QGIS for each shapefile:
1. Change layer encoding to EUC-KR
2. Save as, with CRS and data encoding as shown in the image below.
  - Change CRS from Korean 1985 / Modified Central, EPSG:5174 to WGS84, EPSG:4326
  - Change data encoding from System to UTF8

Convert shp to GeoJSON, TopoJSON

 ogr2ogr -f geojson [geojson_file] [shp_file]
 topojson -p -o [topojson_file] [geojson_file]

Simplify GeoJSONs with http://mapshaper.org/ (with Visvalingam / weighted area, 1% simplification)

Convert simplifies GeoJSONs to KML

 ogr2ogr -f kml [simplified_geojson_file] [kml_file]

GADM

Shapefile, KMZ, RData

To download data files, run:

make get_gadm

GeoJSON

Created from shapefiles with ogr2ogr -f geojson [filename]-geo.json [filename].shp.

TopoJSON

Created from GeoJSON files with topojson [filename]-geo.json -o [filename]-topo.json --properties.

Wikimedia

SVG

To download file, run:

wget http://upload.wikimedia.org/wikipedia/commons/7/77/Administrative_divisions_map_of_South_Korea.svg

POPONG

Precinct

Get a precinct raw table file (국회의원지역선거구구역표) and store it as text file like popong/precinct/precianct_table_20.txt.
The next step is to create a mapping from each municipality/submunicipality in the table to a code in the kostat map file.
```
 cd popong/precinct
 python create_mapping_precinct_to_map.py
```
- But, if you do not have an up-to-date map file (e.g., the most recent one was created in 2013), you need to define exception cases (e.g., submunicipality can be renamed or splitted) on the mismatch_case_precinct_map.py file before you run the create_mapping_precinct_to_map.py file.
- Once the code is successfully run, a geojson file containing a list of submunicipalities, each with the corresponding precinct will be created.
We can now create a precinct map by merging submunicipalities into precincts using mapshaper or similar tools.
```
 mapshaper merge_ready_submunicipalities_into_precinct_20.json -dissolve precinct_no copy-fields=precinct_name,province -o assembly-precinct-20-geo.json
```
- You might want to create TopoJSON from GeoJSON
- To make the size of data smaller and make boundaries prettier, you can simplify it. The simplified versions in this repository were created by creating the simplified version of submunicipality file before we run create_mapping_precinct_to_map.py file.
```
  topojson -p --simplify-proportion 0.4 -o submunicipalities-topo-simplified.json submunicipalities-topo.json
```