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
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.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.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.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.
392
18 章 D3 を使った地図の作成
18.1
利用可能な地図
最も人気がある地図フォーマットは、地図情報システム（
GIS
：
Geographic Information
System
）用に開発された洗練されたシェープファイル（
Shapefile
、
https://ja.wikipedia.org/
wiki/
シェープファイル）です。シェープファイルの操作や作成を行う多くの無料や商用のアプリ
ケーションがあります
†
。
残念ながら、シェープファイルは
Web
向けに設計されていません。
Web
では
JSON
ベースの地
図フォーマットを扱う方がずっと多く、データ量が小さく効率的な表現が要求されます。
幸い、シェープファイルを好ましい
TopoJSON
フォーマットに変換する多くの便利な方法があ
るので
‡
、ソフトウェアでシェープファイルを操作してから
Web
に適したフォーマットに変換でき
ます。
Web
可視化用の地図を探す標準的な方法は、まず
TopoJSON
や
GeoJSON
バージョンを探
し、次に豊富にあるシェープファイルを調べ、最後の手段としてシェープファイルエディタを使っ
て自分で製作します。そこまでしなくても、たいていは市販のものが既にあるでしょう。世界地図
や大陸投影（人気の
Albers-USA
など）などは種類が多くさまざまな精度のものが見つかります。
本書のノーベル賞用の世界地図には、少なくとも
58
か国の受賞国がすべて表示され、しかもほ
ぼすべての国にラベルを付けたいと思います。幸い、
D3
は多くの世界地図のサンプルを用意して ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.