Leaflet.js × D3.js × geojson-vt.js - Redraw Canvas Tiles Map

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Leaflet.js × D3.js × geojson-vt.js - Redraw Canvas Tiles Map

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Last edited Feb 25, 2020

Created on Oct 28, 2018

This example shows a slippy map interface using Leaflet.js alongside D3.js to render geographic boundaries from a GeoJSON dataset. Canvas tiles are generated in the frontend, converting vector data into raster tiles on demand. The core function `addCanvasTile` leverages the `geojson-vt.js` `tileIndex.getTile` API to extract features for a given zoom level and coordinate. Drawing occurs directly on HTML5 canvas elements, and the code uses Canvas `getImageData` to enable click detection on rendered polygons, with D3 selection handling mouse events for property feature identification.

AI-generated description

Reference Blog:<br/> ▶︎ GeoJSONをフロントエンドでベクトルタイル化して表示する。 - GUNMA GIS GEEK<br/>

Reference Code:<br/> ▶︎ https://bl.ocks.org/shimizu/79bb99558dbc27b8fdf456033dc8e893

[Gist] https://gist.github.com/Hirosaji/afabef12e96104e2ea1eaada30273e58

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