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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395
18.2 D3 の地図データフォーマット
...},
"land":{...},
},
"arcs":[[[67002,72360],[284,-219],[209..]], <--
アーク番号
0 #
❹
[[70827,73379],[50,-165]], ... <--
アーク番号
1
...]
"transform":{ #
❺
"scale":[
0.003600036...,
0.001736468...,
],
"translate":[
-180,
-90
]
}
}
❶
TopoJSON
オブジェクトは
Topology
型を持ち、
objects
オブジェクトと
arcs
の配列を含む。
❷ この例ではオブジェクトは
countries
と
land
で、どちらもアーク定義の
GeometryCollection
である。
❸ ジオメトリ（この例では国の形状を定義する）は複数のアークパスで指定する。
arcs
配列
❹
内のインデッ
クスで参照される連続するアークからなる。
❹ オブジェクトを作成するアーク要素の配列。アークはインデックスで参照する。
❺ 位置を浮動小数点数ではなく整数で量子化するために必要な数値。
おそらく
Topology
ファイルを直接操作することはなくその代わりにシェープファイルや
GeoJSON
ファイルに変換することと、
D3
がアークベースの形状を
SVG
パスに変換することを
考えると、既存の
GeoJSON
と
ESRI
（
http://www.esri.com/
）シェープファイルから効率的な
TopoJSON ...
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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.