leaflet-canvaslayer-field
Version:
A set of layers using canvas to draw ASCIIGrid or GeoTIFF files. This includes a basic raster layer (*ScalaField*) and an animated layer for vector fields, such as wind or currents (*VectorFieldAnim*)
67 lines (55 loc) • 2.64 kB
HTML
<html>
<head>
<title>ScalarField / Vector</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
<link rel="stylesheet" href="//unpkg.com/leaflet@1.2.0/dist/leaflet.css" />
<link rel="stylesheet" href="examples.css" />
<link href="https://fonts.googleapis.com/css?family=Roboto:100,400" rel="stylesheet">
</head>
<body>
<h1 class="title mapTitle">ScalarField > Vector</h1>
<div id="map"></div>
<!-- CDN -->
<script src="//d3js.org/d3.v4.min.js"></script>
<script src="//npmcdn.com/leaflet@1.2.0/dist/leaflet.js"></script>
<script src="//npmcdn.com/geotiff@0.3.6/dist/geotiff.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/chroma-js/1.3.0/chroma.min.js"></script>
<!-- Plugin -->
<script src="dist/leaflet.canvaslayer.field.js"></script>
<script>
let map = L.map('map');
/* Basemap */
var url = 'https://cartodb-basemaps-{s}.global.ssl.fastly.net/light_all/{z}/{x}/{y}.png';
L.tileLayer(url, {
attribution: '© <a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors, © <a href="https://carto.com/attributions">CARTO</a>',
subdomains: 'abcd'
}).addTo(map);
/* An ASCIIGrid Raster with Direction From */
d3.request("data/directionFrom.tiff").responseType('arraybuffer').get(
function (error, tiffData) {
let s = L.ScalarField.fromGeoTIFF(tiffData.response);
let filter_nodata = function (v) { return v >= 0; };
let layer = L.canvasLayer.scalarField(s, {
type: 'colormap',
color: chroma.scale('Spectral').domain([0, 360]),
inFilter: filter_nodata
}).addTo(map);
let arrows = L.canvasLayer.scalarField(s, {
type: 'vector',
vectorSize: 20,
arrowDirection: 'from', // from|towards to toggle arrow, if needed
inFilter: filter_nodata
}).addTo(map);
map.fitBounds(layer.getBounds());
layer.on('click', function (e) {
if (e.value !== null) {
let v = e.value.toFixed(3);
let html = `<span class="popupText">Direction ${v}º</span>`; // from - to
let popup = L.popup().setLatLng(e.latlng).setContent(html).openOn(map);
}
});
});
</script>
</body>
</html>