Tizian 「ティツィアーン」
5a5b2feead
A map question is a multiple-choice card drawn on a map: the composer's Map kind takes the region tapped as its answer, and studying it means tapping a region and checking, the right one green and a wrong pick red, each named. The map of Japan's 47 prefectures comes from Natural Earth (public domain), built by tool/maps/japan_prefectures.py from release v5.1.2 (its download checked by hash): simplified, small islands dropped, rounded; about 107 KB. Maps are drawn to fit, tappable and zoomable for small regions. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>
18 lines
909 B
Markdown
18 lines
909 B
Markdown
# Map data
|
||
|
||
`japan_prefectures.geojson` derives from **Natural Earth**
|
||
(<https://www.naturalearthdata.com/>), *Admin 1 – States, Provinces*, 1:10m
|
||
cultural vectors, release v5.1.2. Natural Earth's map data is in the public
|
||
domain:
|
||
|
||
> All versions of Natural Earth raster and vector map data found on this
|
||
> website are in the public domain. You may use the maps in any manner,
|
||
> including modifying the content and design, electronic dissemination, and
|
||
> offset printing.
|
||
|
||
`tool/maps/japan_prefectures.py` builds the file: it keeps Japan's 47
|
||
prefectures, simplifies their outlines (Douglas–Peucker, 0.006°), drops islands
|
||
too small to see (each prefecture keeps its largest), and rounds coordinates to
|
||
4 decimals. The outlines are an approximation for display, not survey-accurate
|
||
data. Regions are named by their ISO 3166-2 codes (`JP-01` … `JP-47`), with
|
||
Natural Earth's English and Japanese names.
|