simplify-japan-geojson

Simplify the Geo-format Prefectures and municipalities of Japan

日本の都道府県と市区町村の GeoJSON を簡素化しました

フォーマット：GeoJSON, TopoJSON

国土数値情報ダウンロードサイトにて提供されている国土数値情報、行政区域データを軽量化しています。

オープンデータ

本コンテンツを利用する際は、必ず、国土数値情報ダウンロードサイトコンテンツ利用規約（政府標準利用規約準拠版）をご確認ください。 ※本データを二次利用する場合には、国土地理院に申請等必要な場合があります。

出典：国土交通省国土数値情報ダウンロードサイト

軽量化

データの軽量化は Mapshaper を使用しました。主なパラメーターは以下になります。

Dissolve
- 全国、地方: N03_001,N03_007
- 北海道の振興局: N03_001,N03_002,N03_007
- 都道府県: N03_001,N03_003,N03_004,N03_007
Simplify
- Simplification: Visvalingam / weighted area
- 全国、北海道の振興局: 0.5 %
- 地方: 1 %
- 都道府県: 5 %

データセット

「国土数値情報（行政区域データ）」（国土交通省）を加工して作成

データの基準年月日 2024 年（令和 6 年）1 月 1 日時点

測地系：世界測地系
年：2024 年（令和 6 年）

単位	ファイル名	Dissolve	Simplify (%)	Polygon
全国	N03-20240101_prefecture	N03_001,N03_007	0.5	47
北海道の振興局	N03-20240101_01_subprefecture	N03_001,N03_002,N03_007	0.5	14
北海道	N03-20240101_01	N03_001,N03_002,N03_003,N03_004,N03_007	5	194
東北地方	N03-20240101_52_prefecture	03_001,N03_007	1	6
青森	N03-20240101_02	N03_001,N03_003,N03_004,N03_007	5	40
岩手	N03-20240101_03	N03_001,N03_003,N03_004,N03_007	5	33
宮城	N03-20240101_04	N03_001,N03_003,N03_004,N03_007	5	39
秋田	N03-20240101_05	N03_001,N03_003,N03_004,N03_007	5	25
山形	N03-20240101_06	N03_001,N03_003,N03_004,N03_007	5	35
福島	N03-20240101_07	N03_001,N03_003,N03_004,N03_007	5	59
関東地方	N03-20240101_53_prefecture	03_001,N03_007	1	7
茨城	N03-20240101_08	N03_001,N03_003,N03_004,N03_007	5	44
栃木	N03-20240101_09	N03_001,N03_003,N03_004,N03_007	5	25
群馬	N03-20240101_10	N03_001,N03_003,N03_004,N03_007	5	35
埼玉	N03-20240101_11	N03_001,N03_003,N03_004,N03_007	5	72
千葉	N03-20240101_12	N03_001,N03_003,N03_004,N03_007	5	60
東京	N03-20240101_13	N03_001,N03_003,N03_004,N03_007	5	63
神奈川	N03-20240101_14	N03_001,N03_003,N03_004,N03_007	5	58
甲信越・北陸地方	N03-20240101_54_prefecture	03_001,N03_007	1	6
新潟	N03-20240101_15	N03_001,N03_003,N03_004,N03_007	5	37
富山	N03-20240101_16	N03_001,N03_003,N03_004,N03_007	5	15
石川	N03-20240101_17	N03_001,N03_003,N03_004,N03_007	5	19
福井	N03-20240101_18	N03_001,N03_003,N03_004,N03_007	5	17
山梨	N03-20240101_19	N03_001,N03_003,N03_004,N03_007	5	27
長野	N03-20240101_20	N03_001,N03_003,N03_004,N03_007	5	77
東海地方	N03-20240101_55_prefecture	03_001,N03_007	1	4
岐阜	N03-20240101_21	N03_001,N03_003,N03_004,N03_007	5	42
静岡	N03-20240101_22	N03_001,N03_003,N03_004,N03_007	5	39
愛知	N03-20240101_23	N03_001,N03_003,N03_004,N03_007	5	70
三重	N03-20240101_24	N03_001,N03_003,N03_004,N03_007	5	70
近畿地方	N03-20240101_56_prefecture	03_001,N03_007	1	6
滋賀	N03-20240101_25	N03_001,N03_003,N03_004,N03_007	5	19
京都	N03-20240101_26	N03_001,N03_003,N03_004,N03_007	5	36
大阪	N03-20240101_27	N03_001,N03_003,N03_004,N03_007	5	72
兵庫	N03-20240101_28	N03_001,N03_003,N03_004,N03_007	5	49
奈良	N03-20240101_29	N03_001,N03_003,N03_004,N03_007	5	39
和歌山	N03-20240101_30	N03_001,N03_003,N03_004,N03_007	5	31
**地方	N03-20240101_57_prefecture	03_001,N03_007	1	5
鳥取	N03-20240101_31	N03_001,N03_003,N03_004,N03_007	5	19
島根	N03-20240101_32	N03_001,N03_003,N03_004,N03_007	5	19
岡山	N03-20240101_33	N03_001,N03_003,N03_004,N03_007	5	30
広島	N03-20240101_34	N03_001,N03_003,N03_004,N03_007	5	30
山口	N03-20240101_35	N03_001,N03_003,N03_004,N03_007	5	19
四国地方	N03-20240101_58_prefecture	03_001,N03_007	1	4
徳島	N03-20240101_36	N03_001,N03_003,N03_004,N03_007	5	24
香川	N03-20240101_37	N03_001,N03_003,N03_004,N03_007	5	17
愛媛	N03-20240101_38	N03_001,N03_003,N03_004,N03_007	5	20
高知	N03-20240101_39	N03_001,N03_003,N03_004,N03_007	5	34
九州地方	N03-20240101_59_prefecture	03_001,N03_007	1	7
福岡	N03-20240101_40	N03_001,N03_003,N03_004,N03_007	5	73
佐賀	N03-20240101_41	N03_001,N03_003,N03_004,N03_007	5	20
長崎	N03-20240101_42	N03_001,N03_003,N03_004,N03_007	5	21
熊本	N03-20240101_43	N03_001,N03_003,N03_004,N03_007	5	49
大分	N03-20240101_44	N03_001,N03_003,N03_004,N03_007	5	18
宮崎	N03-20240101_45	N03_001,N03_003,N03_004,N03_007	5	26
鹿児島	N03-20240101_46	N03_001,N03_003,N03_004,N03_007	5	44
沖縄	N03-20240101_47	N03_001,N03_003,N03_004,N03_007	5	42