leaflet-gridviz

A plugin for Leaflet to show gridviz maps.

Demo

Population census gridviz layer in leaflet | see code

Usage

// import leaflet-gridviz after importing leaflet
<script src="https://www.unpkg.com/leaflet-gridviz"></script>

// create your leaflet map
var map = new L.Map('map', {
    crs: crs,
    center: ['50.00754', '19.98211'],
})

// define your leaflet-gridviz layer
let gridvizLayer = new L.GridvizLayer({
    proj: 'EPSG:3035',
    onLayerDidMountCallback: () => {
        // define our gridviz layer once the layer is mounted by accessing the app
        gridvizLayer.app
            .addMultiScaleTiledGridLayer(
                [1000, 2000, 5000, 10000, 20000, 50000, 100000],
                (r) =>
                    'https://raw.githubusercontent.com/jgaffuri/tiledgrids/main/data/europe/population/' +
                    r +
                    'm/',
                gridviz.TanakaStyle.get('2018', {
                    tFun: (v, r, s, zf) =>
                        gridviz.sExpRev((v - s.min) / (s.max - s.min), -7),
                    nb: 6,
                    color: (t) => d3.interpolateInferno(t * 0.9 + 0.1),
                    colDark: '#333',
                }),
                {
                    pixNb: 6,
                    cellInfoHTML: (c) => '<b>' + c['2018'] + '</b> inhabitant(s)',
                }
            )
    }
})

// add it to the map
gridvizLayer.addTo(map)

Note: this has only been tested with EPSG:3035 grids

Feel free to contribute or open an issue!

Installation for development

With node.js 14.20.1:

npm install
npm start