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*)
104 lines (83 loc) • 4.34 kB
HTML
<html>
<head>
<title>ScalarField / Geotiff WCS </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 WCS</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');
/* Dark basemap */
let url = 'https://cartodb-basemaps-{s}.global.ssl.fastly.net/dark_nolabels/{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);
/* DTM from an OGC-WCS */
// let getCapabilities = "http://www.juntadeandalucia.es/medioambiente/mapwms/REDIAM_WCS_mdt?SERVICE=wcs&VERSION=1.0.0&REQUEST=GetCapabilities";
let getCoverage = "https://www.juntadeandalucia.es/medioambiente/mapwms/REDIAM_WCS_mdt?";
getCoverage += "SERVICE=wcs&";
getCoverage += "VERSION=1.0.0&";
getCoverage += "REQUEST=GetCoverage&";
getCoverage += "COVERAGE=Modelo Digital de Elevaciones (MDE) de Andalucia 100 m&";
getCoverage += "CRS=EPSG:4326&";
getCoverage += "BBOX=-7.58390693285438,35.964208075556,-1.6006002035338,38.7503547383259&"; // full extension...
getCoverage += "RESX=0.01&"; // ...but reduced resolution (~800m)
getCoverage += "RESY=0.01&";
getCoverage += "FORMAT=GTiff";
let urlCoverage = encodeURI(getCoverage);
//console.log(urlCoverage);
let geo;
let dtm;
let colorScale;
// palette from http://www.juntadeandalucia.es/medioambiente/site/rediam/menuitem.04dc44281e5d53cf8ca78ca731525ea0/?vgnextoid=f6284d9721fa3410VgnVCM2000000624e50aRCRD&vgnextchannel=8ca090a63670f210VgnVCM2000000624e50aRCRD&vgnextfmt=rediam&lr=lang_es
let juntaColors = ['#E4EF75', '#B3CF82', '#799B3C', '#60632C', '#A88446', '#CDB2B9', '#593815', '#CDB2B9', '#F4F2F5'];
d3.request(urlCoverage).responseType('arraybuffer').get(
function (error, tiffData) {
// band 0
geo = L.ScalarField.fromGeoTIFF(tiffData.response);
colorScale = chroma.scale('RdYlGn').domain([geo.range[1], geo.range[0]]);
dtm = L.canvasLayer.scalarField(geo, {
color: colorScale,
opacity: 0.7,
inFilter: (v) => v > 0
}).addTo(map);
map.fitBounds(dtm.getBounds());
dtm.on('click', function (e) {
if (e.value !== null) {
let v = e.value.toFixed(0);
let html = (`<span class="popupText">Height: ${v} meters</span><br/>`);
html += "<a href='#' onclick='styleGradient();'>gradient</a> | ";
html += "<a href='#' onclick='styleClasses();'>classes</a> | ";
html += "<a href='#' onclick='original();'>redGreen</a>";
let popup = L.popup()
.setLatLng(e.latlng)
.setContent(html)
.openOn(map);
}
});
});
function original() {
dtm.setColor(colorScale);
}
function styleClasses() {
dtm.setColor(chroma.scale(juntaColors).classes([0, 200, 400, 600, 900, 1100, 1400, 1700, 2300, 3500]));
}
function styleGradient() {
dtm.setColor(chroma.scale(juntaColors).domain(geo.range));
}
</script>
</body>
</html>