GIS and local information

[babayoshihiko]

@yuriei @ishaberry @ebuajitti and @aspina7 @hitomik723
This is a copy of an issue from epiRhandbook_jp regarding gis.Rmd (28 GIS basics):
appliedepi/epiRhandbook_jp#5

Geographic Information System (GIS) is geography-dependent, i.e. the national/local governments may maintain their coordinate systems and provide data such as national census and buildings. I suggest adding local information to the Japanese version of GIS.Rmd.

Below is a sample of additional information for readers in Japan.

Key terms

Visualizing spatial data {.unnumbered}

CRS used in Japan

* Japan Plane Rectangular CS I to XIII, EPSG: 2443-2455
* JGD2011 GRS80 ellipsoid, EPSG:6668

Getting started with GIS

GIS data available for Japan

*  [Census](http://e-stat.go.jp/SG2/eStatGIS/page/download.html) population by address
*  [Suuchi](http://nlftp.mlit.go.jp/ksj/) - a variety of features (e.g. hospitals, schools, school districts)
*  [Kiban](http://www.gsi.go.jp/kiban/etsuran.html) - e.g. building and road edges
*  [Geospatial Japan](https://www.geospatial.jp/ckan/dataset) - a portal of GIS data by local governments and others

Preparation

Sample case data

In the code, the SRID=4326 is used. This is mainly for USA. Japanese government has maintained its own coordinate system and revised in 2000 and 2011 (the latter following the Great East Japan Earthquake).

| Coordinates | EPSG | Region |
| :--- | :--- | :------- |
| lat/lon | 4326 | US |
| lat/lon | 3857 | Web |
| lat/lon | 4612 | Japan (JGD2000) |
| lat/lon | 6668 | Japan (JGD2011) |