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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396
18 章 D3 を使った地図の作成
$ topojson geo_input.json > topo_output.json
topojson
は
ESRI
シェープファイルも変換します。
$ topojson -o topo_output.json input.shp
また、
topojson
は
CSV
ファイルを
TopoJSON
に変換することもできます。
CSV
の各行はポイ
ントのフィーチャを表します。
topojson
には、地図の精度を指定できる量子化などの多くの便利なオプションがあります。
このオプションを調整すると、品質劣化があまりわからない小さなファイルを作成できます。簡
略化も同様のオプションで、詳細とファイルサイズのバランスを調整できます。完全な仕様は
TopoJSON
の
GitHub
ページ（
https://github.com/topojson/topojson-1.x-api-reference/blob/
master/Command-Line-Reference.md
）で確認できます。
地図ファイルをプログラムで変換したければ、そのための便利な
Python
ライブラリ
topojson.
py
があります。
GitHub
（
https://github.com/calvinmetcalf/topojson.py
）から入手できます。
軽量で効率的な
Web
に最適なフォーマットの地図データが得られたので、
JavaScript
を使って
地図データをインタラクティブな
Web
地図に変換する方法を確認してみましょう。 ...
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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.