Using Leaflet - raster interpolation
Leaflet example from the Leaflet section section. This example only includes the interpolated raster layer.
<!DOCTYPE html>
<html>
<head>
<title>GeoJSON tutorial - Leaflet</title>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="https://unpkg.com/leaflet@1.0.2/dist/leaflet.css" />
<script src="https://unpkg.com/leaflet@1.0.2/dist/leaflet.js"></script>
<script src="geotiff.min.js"></script>
<script src="raster-marching-squares.min.js"></script>
<style>
#map {
width: 680px;
height: 500px;
}
</style>
</head>
<body>
<div id='map'></div>
<script>
var xhr = new XMLHttpRequest();
xhr.open('GET', 'vardah.tiff', true);
xhr.responseType = 'arraybuffer';
xhr.onload = function(e) {
var tiff = GeoTIFF.parse(this.response);
var image = tiff.getImage();
var tiffWidth = image.getWidth();
var tiffHeight = image.getHeight();
var rasters = image.readRasters();
var tiepoint = image.getTiePoints()[0];
var pixelScale = image.getFileDirectory().ModelPixelScale;
var geoTransform = [tiepoint.x, pixelScale[0], 0, tiepoint.y, 0, -1*pixelScale[1]];
var pressData = new Array(tiffHeight);
var tempData = new Array(tiffHeight);
var uData = new Array(tiffHeight);
var vData = new Array(tiffHeight);
var spdData = new Array(tiffHeight);
for (var j = 0; j<tiffHeight; j++){
pressData[j] = new Array(tiffWidth);
tempData[j] = new Array(tiffWidth);
uData[j] = new Array(tiffWidth);
vData[j] = new Array(tiffWidth);
spdData[j] = new Array(tiffWidth);
for (var i = 0; i<tiffWidth; i++){
pressData[j][i] = rasters[0][i + j*tiffWidth];
tempData[j][i] = rasters[1][i + j*tiffWidth];
uData[j][i] = rasters[2][i + j*tiffWidth];
vData[j][i] = rasters[3][i + j*tiffWidth];
spdData[j][i] = 1.943844492 * Math.sqrt(uData[j][i]*uData[j][i] + vData[j][i]*vData[j][i]);
}
}
//Creating the color scale https://github.com/santilland/plotty/blob/master/src/plotty.js
var cs_def = {positions:[0.0,0.030303030303,0.0606060606061,0.0909090909091,0.121212121212,0.151515151515,0.181818181818,0.212121212121,0.242424242424,0.272727272727,0.30303030303,0.333333333333,0.363636363636,0.393939393939,0.424242424242,0.454545454545,0.484848484848,0.515151515152,0.545454545455,0.575757575758,0.606060606061,0.636363636364,0.666666666667,0.69696969697,0.727272727273,0.757575757576,0.787878787879,0.818181818182,0.848484848485,0.878787878788,0.909090909091,0.939393939394,0.969696969697,1.0],
colors:["#ffffff", "#e5e5e6" , "#d1d1d1", "#bababa", "#979797", "#646464",
"#1464d3", "#1e6eeb", "#2883f1", "#3c97f5", "#50a5f5", "#78b9fb", "#97d3fb", "#b5f1fb", "#e1ffff",
"#0ea10e", "#1eb31e", "#36d33c", "#50ef50", "#78f572", "#97f58d", "#b5fbab", "#c9ffbf",
"#ffe978", "#ffc13c", "#ffa100", "#ff6000", "#ff3200", "#e11400", "#c10000", "#a50000",
"#643c32", "#785046", "#8d645a"]};
var scaleWidth = 256;
var canvasColorScale = document.createElement('canvas');
canvasColorScale.width = scaleWidth;
canvasColorScale.height = 1;
canvasColorScale.style.display = "none";
document.body.appendChild(canvasColorScale);
var contextColorScale = canvasColorScale.getContext("2d");
var gradient = contextColorScale.createLinearGradient(0, 0, scaleWidth, 1);
for (var i = 0; i < cs_def.colors.length; ++i) {
gradient.addColorStop(cs_def.positions[i], cs_def.colors[i]);
}
contextColorScale.fillStyle = gradient;
contextColorScale.fillRect(0, 0, scaleWidth, 1);
var csImageData = contextColorScale.getImageData(0, 0, scaleWidth-1, 1).data;
//Calculating the image
var width = 680,
height = 500;
var canvasRaster = document.createElement('canvas');
canvasRaster.width = width;
canvasRaster.height = height;
canvasRaster.style.display = "none";
document.body.appendChild(canvasRaster);
var contextRaster = canvasRaster.getContext("2d");
var id = contextRaster.createImageData(width,height);
var data = id.data;
var pos = 0;
var invGeoTransform = [-geoTransform[0]/geoTransform[1], 1/geoTransform[1],0,-geoTransform[3]/geoTransform[5],0,1/geoTransform[5]];
for(var j = 0; j<height; j++){
for(var i = 0; i<width; i++){
var pointCoordsX = geoTransform[0] + i*tiffWidth*geoTransform[1]/width;
var pointCoordsY = geoTransform[3] + j*tiffHeight*geoTransform[5]/height;
var px = invGeoTransform[0] + pointCoordsX * invGeoTransform[1];
var py = invGeoTransform[3] + pointCoordsY * invGeoTransform[5];
var value;
if(Math.floor(px) >= 0 && Math.ceil(px) < image.getWidth() && Math.floor(py) >= 0 && Math.ceil(py) < image.getHeight()){
var dist1 = (Math.ceil(px)-px)*(Math.ceil(py)-py);
var dist2 = (px-Math.floor(px))*(Math.ceil(py)-py);
var dist3 = (Math.ceil(px)-px)*(py-Math.floor(py));
var dist4 = (px-Math.floor(px))*(py-Math.floor(py));
if (dist1 != 0 || dist2!=0 || dist3!=0 || dist4!=0){
value = spdData[Math.floor(py)][Math.floor(px)]*dist1+
spdData[Math.floor(py)][Math.ceil(px)]*dist2 +
spdData[Math.ceil(py)][Math.floor(px)]*dist3 +
spdData[Math.ceil(py)][Math.ceil(px)]*dist4;
} else {
value = spdData[Math.floor(py)][Math.floor(px)];
}
} else {
value = -999;
}
var c = Math.round((scaleWidth-1) * ((value - 8)/88));
var alpha = 200;
if (c<0 || c > (scaleWidth-1)){
alpha = 0;
}
data[pos] = csImageData[c*4];;
data[pos+1] = csImageData[c*4+1];
data[pos+2] = csImageData[c*4+2];
data[pos+3] = alpha;
pos = pos + 4
}
}
contextRaster.putImageData( id, 0, 0);
var imageBounds = [[geoTransform[3], geoTransform[0]], [geoTransform[3] + tiffHeight*geoTransform[5], geoTransform[0] + tiffWidth*geoTransform[1]]];
var imageLayer = L.imageOverlay(canvasRaster.toDataURL(), imageBounds,{
opacity: 0.5
});
var baseLayer = L.tileLayer('https://api.tiles.mapbox.com/v4/{id}/{z}/{x}/{y}.png?access_token=pk.eyJ1IjoibWFwYm94IiwiYSI6ImNpandmbXliNDBjZWd2M2x6bDk3c2ZtOTkifQ._QA7i5Mpkd_m30IGElHziw', {
maxZoom: 18,
attribution: 'Map data © <a href="http://openstreetmap.org">OpenStreetMap</a> contributors, ' +
'<a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, ' +
'Imagery © <a href="http://mapbox.com">Mapbox</a>',
id: 'mapbox.light'
});
var map = L.map('map', {
layers: [baseLayer, imageLayer]
}).setView([13, 81], 6);
map.on('click', function(e) {
var xTiff = (e.latlng.lng - geoTransform[0])/geoTransform[1];
var yTiff = ( e.latlng.lat - geoTransform[3])/geoTransform[5];
var temp = tempData[Math.round(yTiff)][Math.round(xTiff)];
var press = pressData[Math.round(yTiff)][Math.round(xTiff)];
var uValue = uData[Math.round(yTiff)][Math.round(xTiff)];
var vValue = vData[Math.round(yTiff)][Math.round(xTiff)];
var spd = Math.sqrt(uValue*uValue + vValue*vValue);
var dir = 270 + (Math.atan2(-vValue,uValue)*180/Math.PI);
if(dir<0){dir = dir + 360;}
if(dir>360){dir = dir - 360;}
L.popup()
.setLatLng(e.latlng)
.setContent("Wind speed: " + spd.toFixed(1) + " kt <br/>Wind dir: " + dir.toFixed(0) +"º <br/>Temp: " + temp.toFixed(1) + " C<br/>Pressure: " + press.toFixed(0) + " hPa")
.openOn(map);
});
};
xhr.send();
</script>
</body>
</html>