この記事はWordPress上にLeafletで地図を載せる(その③)～表示サンプルの続きで、前回の新潟県より山梨県へ至る道で地図を載せたときのサンプルコードを載せます。
サンプルコードを載せる前に、実際にはこんな感じで地図を載せるためのHTMLを書いています。百聞は一見にしかずということで、実際の投稿画面のスクリーンショットを。
WordPressの記事でLeafletを使って地図を表示する
こんな感じで、テキストモードの投稿画面、「<div>」タグの中身をゴリゴリ書いています。
<div id="leafletmap"><script>
//切り替え可能とするタイルレイヤを生成（タイルURL，ズーム範囲，著作権表示などをオプションで設定）
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attribution: "地理院タイル"
})
var pal = L.tileLayer('http://cyberjapandata.gsi.go.jp/xyz/pale/{z}/{x}/{y}.png', {
minZoom: 5, maxZoom: 18,
attribution: "地理院タイル"
})
var blk = L.tileLayer('http://cyberjapandata.gsi.go.jp/xyz/blank/{z}/{x}/{y}.png', {
minZoom: 5, maxZoom: 14,
attribution: "地理院タイル"
})
var ort = L.tileLayer('http://cyberjapandata.gsi.go.jp/xyz/ort/{z}/{x}/{y}.jpg', {
minZoom: 5, maxZoom: 18,
attribution: "地理院タイル"
})
var rapid = L.tileLayer('https://aginfo.cgk.affrc.go.jp/ws/tmc/1.0.0/Kanto_Rapid-900913/{z}/{x}/{y}.png', {
tms: true, opacity: 1.0,
minZoom: 8, maxZoom: 16,
attribution: "迅速測図(農業環境技術研究所)"
})
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]
};
var stLine = {
"color": "#ff0000",
"weight": 5,
"opacity": 1
};
//
//地図を生成（初期表示の中心座標，ズームレベル，レイヤなどをオプションで設定）
var map = L.map('leafletmap', {center: [36.2,139.2], zoom: 11,layers: [rapid]});
//
//GeoJsonを追加
var lyGJLn = L.geoJSON(gsLines,{style:stLine}).addTo(map);
var lyGJPt = L.geoJSON(gsPoints).addTo(map);
//
//レイヤコントロールに切り替え可能とするレイヤを追加
L.control.layers({
'地理院タイル（標準地図）': std,
'地理院タイル（淡色地図）': pal,
'地理院タイル（写真）': ort,
'明治期迅速測図': rapid
},
{
'新潟県より山梨県へ至る道(トレース)': lyGJLn,
'新潟県より山梨県へ至る道(記載箇所)': lyGJPt,
}, {collapsed: true}).addTo(map);
//
//
//スケールコントロールを追加（オプションはフィート単位を非表示）
L.control.scale({imperial: false}).addTo(map);
</script>
</div>
コードを書くのに先だって、Leaflet関連のJavaScriptやらCSSを読み込むために、記事のカテゴリを設定します。
次に、これはWordPressに書き込む時の特有ですが、空行があると「<P>」が勝手に挿入されてしまうので、Leaflet関連の「<div id=”leafletmap”></div>」の間には空行が無いようにします。ソースが読みやすいように行を開けたい場合はコメントの「//」を入れておくようにしてください。
GeoJSONを表示するのにあたってハマったのが測地系周り。GooJSONではサンプルの28行目にあるように測地系を定義しています。最初はEPSG:3857でGeoJSONを吐き出したのですが、何も表示されませんでした。緯度経度の座標系、とくに世界測地系でないとダメなようです。
ちなみに、25～43行目がポイント、44～55行目がラインで、それぞれQGISから出力したGeoJSONをテキストエディタで開いてコピペしています。(それぞれ先頭行のイコールの後)
あと、本当はGeoJSONファイルを外に置きたかったのですが、面倒くさそうな雰囲気だったのでとりあえずはBlog記事の中に埋め込んでしまいました。
2021/5/19追記 GeoJSONファイルを外に置く方法を記事に書きました。
WordPress上にLeafletで地図を載せる(その⑤)～GeoJSONファイルを読み取る
そして、上記のコードを貼り付けて表示した地図が下記の通りと言うことになります。
関連項目
WordPress上にLeafletで地図を載せる(その①)
WordPress上にLeafletで地図を載せる(その②)
WordPress上にLeafletで地図を載せる(その③)～表示サンプル
本記事の作成にあたって参考にしたサイト。
Using GeoJSON with Leaflet
https://leafletjs.com/examples/geojson/