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kernelsmoothing.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Gridviz smoothing example</title>
<style>
html,
body {
height: 100%; /* Ensure the parent elements have a height so that the map can take up 100% correctly */
margin: 0; /* Remove default margins to prevent scrolling */
overflow: hidden; /* Prevent potential scrollbars */
}
</style>
</head>
<body>
<div>
Style<br /><select id="style">
<option value="color" selected>Color - continuous</option>
<option value="color_discrete">Color - discrete</option>
<option value="size">Circle size - continuous</option>
<option value="size_discrete">Circle size - discrete</option>
</select>
<br />Smoothing<br />
<input type="range" min="3" max="30" value="10" class="slider" id="sigma" />
</div>
<div id="map" style="height: 100%; width: 100%"></div>
<script src="../../dist/gridviz.js"></script>
<script src="https://cdn.jsdelivr.net/npm/gridviz-smoothing@2.0.2"></script>
<script src="https://cdn.jsdelivr.net/npm/d3-array@3"></script>
<script src="https://cdn.jsdelivr.net/npm/d3-color@3"></script>
<script src="https://cdn.jsdelivr.net/npm/d3-interpolate@3"></script>
<script src="https://cdn.jsdelivr.net/npm/d3-scale-chromatic@3"></script>
<script>
//define map with initial view
const map = new gridviz.Map(document.getElementById('map'), {
x: 4500000,
y: 2900000,
z: 3000,
}).addZoomButtons()
//define multi resolution dataset
const dataset = new gridviz.MultiResolutionDataset(
[1000, 2000, 5000, 10000, 20000, 50000, 100000],
(resolution) =>
new gridviz.TiledGrid(
map,
'https://raw.githubusercontent.com/jgaffuri/tiledgrids/main/data/europe/population2/' +
resolution +
'm/'
)
)
//define style
const smoothingStyle = new gridviz_smoothing.KernelSmoothingStyle({
value: (cell) => +cell.TOT_P_2021,
filterSmoothed: (value) => value > 0.001,
})
//add layer to map
map.layers = [new gridviz.GridLayer(dataset, [smoothingStyle])]
//
const update = () => {
//set sigma
const sig = +document.querySelector('#sigma').value
smoothingStyle.sigma = (resolution, z) => (resolution * sig) / 10
//set selected style
const sty = document.querySelector('#style').value
if (sty == 'color') {
smoothingStyle.factor = 3
const scale = gridviz.exponentialScale(-20)
smoothingStyle.styles = [
new gridviz.SquareColorWebGLStyle({
color: (t) => d3.interpolateYlOrRd(t), //d3.interpolateCividis, interpolateSpectral
viewScale: (cells) => d3.max(cells, (cell) => +cell.ksmval),
tFun: (cell, resolution, z, max) => {
const t = scale(cell.ksmval / max)
return t
},
}),
]
} else if (sty == 'color_discrete') {
smoothingStyle.factor = 2
smoothingStyle.styles = [
new gridviz.ShapeColorSizeStyle({
color: (c, r, z, viewScale) => viewScale(c.ksmval),
viewScale: gridviz.viewScaleColor({
valueFunction: (c) => +c.ksmval,
colors: d3.schemeYlOrRd[7],
stretching: gridviz.logarithmicScale(-7),
}),
}),
]
} else if (sty == 'size') {
smoothingStyle.factor = 8
smoothingStyle.styles = [
new gridviz.ShapeColorSizeStyle({
size: (c, r, z, viewScale) => viewScale(c.ksmval),
viewScale: gridviz.viewScale({
valueFunction: (c) => +c.ksmval,
maxSizeFactor: 1.3,
minSizePix: 1,
stretching: gridviz.logarithmicScale(-7),
}),
shape: () => 'circle',
color: () => 'black',
}),
]
} else if (sty == 'size_discrete') {
smoothingStyle.factor = 8
smoothingStyle.styles = [
new gridviz.ShapeColorSizeStyle({
size: (c, r, z, viewScale) => viewScale(c.ksmval),
viewScale: gridviz.viewScale({
valueFunction: (c) => +c.ksmval,
maxSizeFactor: 1.3,
minSizePix: 1,
stretching: gridviz.logarithmicScale(-7),
classNumber: 7,
}),
shape: () => 'circle',
color: () => 'black',
}),
]
}
//redraw
map.redraw()
}
//style selection
document.getElementById('style').addEventListener('change', update)
//sigma selection
document.getElementById('sigma').oninput = update
update()
</script>
</body>
</html>