August 2017
Intermediate to advanced
500 pages
12h 3m
Japanese
Content preview from PythonとJavaScriptではじめるデータビジュアライゼーション
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393
18.2 D3 の地図データフォーマット
次にこの
2
つのフォーマットを調べてみましょう。基本構造を理解しておくと、さらに挑戦的
な地図を作成するときに、少しの労力で大きな効果が得られます。
18.2.1
GeoJSON
GeoJSON
ファイルには、
1
つの
type
オブジェクト（
Point
、
MultiPoint
、
LineString
、
MultiLineString
、
Polygon
、
MultiPolygon
、
GeometryCollection
、
Feature
、
FeatureCollection
のいずれか）が含まれています。
type
メンバー値は、上記に示したようにキャメルケース（
http://
bit.ly/1V2p2Yr
）にします。
crs
メンバーが含まれる場合もあり、
crs
メンバーは特定の座標参照
系を指定します。
FeatureCollection
は最大の
GeoJSON
コンテナで、通常は複数の地域を持つ地図は
Feature
Collection
で規定します。
FeatureCollection
には
features
配列が含まれ、その要素は上記に列挙
した型の
GeoJSON
オブジェクトです。
例
18-1
に国地図の配列を含む一般的な
FeatureCollection
を示します。この国地図の境界はポ
リゴン（多角形）で指定します。
例
18-1
GeoJSON
地図データフォーマット
{
"type": "FeatureCollection", #
❶
"features": [ #
❷
{
"type": "Feature", ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.