dayjournal | Leaflet #027 – ヒートマップ

Leafletでヒートマップを作成するには、「Leaflet.heat」と言うプラグインを利用します。

index.html


<!DOCTYPE html>
<html lang="ja">

<head>
    <meta charset="UTF-8">
    <title>Leaflet Sample</title>

    <script src="./library/leaflet-1.0.1/leaflet.js"></script>
    <link href="./library/leaflet-1.0.1/leaflet.css" rel="stylesheet" />

    <script src="./plugin/Leaflet.heat/dist/leaflet-heat.js"></script>

    <link href="./css/stylesheet.css" rel="stylesheet" />

</head>
<body>

    <div id="map"></div>
    <script src="./js/script.js"></script>

</body>
</html>

stylesheet.css


html, body {
    height: 100%;
    padding: 0;
    margin: 0;
}

#map {
    z-index: 0;
    height: 100%;
}

script.js


var mierune_mono = new L.tileLayer('https://tile.mierune.co.jp/mierune_mono/{z}/{x}/{y}.png', {
    attribution: "Maptiles by <a href='http://mierune.co.jp/' target='_blank'>MIERUNE</a>, under CC BY. Data by <a href='http://osm.org/copyright' target='_blank'>OpenStreetMap</a> contributors, under ODbL."
});

var mierune_color = new L.tileLayer('https://tile.mierune.co.jp/mierune/{z}/{x}/{y}.png', {
    attribution: "Maptiles by <a href='http://mierune.co.jp/' target='_blank'>MIERUNE</a>, under CC BY. Data by <a href='http://osm.org/copyright' target='_blank'>OpenStreetMap</a> contributors, under ODbL."
});

var map = L.map('map', {
    center: [35.6831925, 139.7511307],
    zoom: 12,
    zoomControl: true,
    layers: [mierune_mono]
});

var heat = L.heatLayer([
    [35.6831, 139.7500, 50],
    [35.6831, 139.7550, 10],
    [35.6831, 139.7600, 50],
    [35.6831, 139.7650, 10],
    [35.6831, 139.7700, 50],
    [35.6881, 139.7500, 10],
    [35.6931, 139.7500, 50],
    [35.6981, 139.7500, 10],
    [35.6781, 139.7500, 50],
    [35.6731, 139.7500, 10]
], {
    radius: 30
}).addTo(map);

var Map_BaseLayer = {
    "MIERUNE MONO": mierune_mono,
    "MIERUNE Color": mierune_color
};

L.control.scale({
    imperial: false,
    maxWidth: 300
}).addTo(map);

L.control.layers(Map_BaseLayer, null, {
    collapsed: true
}).addTo(map)

index.htmlを実行すると下記のようにブラウザで表示されます。

example

サークル半径変更：


var heat = L.heatLayer([
    [35.6831, 139.7500, 50],
    [35.6831, 139.7550, 10],
    [35.6831, 139.7600, 50],
    [35.6831, 139.7650, 10],
    [35.6831, 139.7700, 50],
    [35.6881, 139.7500, 10],
    [35.6931, 139.7500, 50],
    [35.6981, 139.7500, 10],
    [35.6781, 139.7500, 50],
    [35.6731, 139.7500, 10]
], {
    radius: 50
}).addTo(map)

ぼかし変更：


var heat = L.heatLayer([
    [35.6831, 139.7500, 50],
    [35.6831, 139.7550, 10],
    [35.6831, 139.7600, 50],
    [35.6831, 139.7650, 10],
    [35.6831, 139.7700, 50],
    [35.6881, 139.7500, 10],
    [35.6931, 139.7500, 50],
    [35.6981, 139.7500, 10],
    [35.6781, 139.7500, 50],
    [35.6731, 139.7500, 10]
], {
    radius: 30,
    blur: 1
}).addTo(map)

ヒートマップ機能を実装したい時に便利なプラグインです。

参考文献
Leaflet
Leaflet.heat

dayjournal memo

Leaflet #027 – ヒートマップ

Yasunori Kirimoto 2017/1/23

index.html

stylesheet.css

script.js

example