Added webapp.
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Felix Delattre
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webapp/index.html
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webapp/index.html
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<!DOCTYPE html>
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<html>
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<head>
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<title>NDVI Viewer</title>
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<link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css" />
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<script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js"></script>
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<script src="https://cdn.jsdelivr.net/npm/geotiff@2.0.7/dist-browser/geotiff.js"></script>
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<script src="https://cdn.jsdelivr.net/npm/proj4@2.9.0/dist/proj4.js"></script>
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<style>
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body { margin: 20px; font-family: sans-serif; }
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.container { max-width: 1400px; margin: 0 auto; }
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.slider-container { margin: 20px 0; }
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#dateSlider { width: 100%; }
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#dateDisplay { text-align: center; margin: 10px 0; font-size: 18px; }
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.maps { display: flex; gap: 20px; }
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.map-container { flex: 1; }
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.map-container h3 { margin: 10px 0; text-align: center; }
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.timeseries { width: 100%; height: 120px; border: 1px solid #ccc; margin-bottom: 10px; }
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.map { height: 500px; border: 1px solid #ccc; }
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.leaflet-image-layer { image-rendering: pixelated; }
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</style>
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</head>
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<body>
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<div class="container">
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<div class="slider-container">
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<input type="range" id="dateSlider" min="0" max="365" value="0">
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<div id="dateDisplay">2024-01-01</div>
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</div>
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<div class="maps">
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<div class="map-container">
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<h3>S2</h3>
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<canvas id="s2timeseries" class="timeseries"></canvas>
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<div id="s2map" class="map"></div>
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</div>
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<div class="map-container">
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<h3>S3</h3>
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<canvas id="s3timeseries" class="timeseries"></canvas>
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<div id="s3map" class="map"></div>
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</div>
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</div>
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</div>
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<script>
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proj4.defs("EPSG:32632", "+proj=utm +zone=32 +datum=WGS84 +units=m +no_defs");
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proj4.defs("EPSG:4326", "+proj=longlat +datum=WGS84 +no_defs");
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const start = new Date(2024, 0, 1);
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const slider = document.getElementById("dateSlider");
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const dateDisplay = document.getElementById("dateDisplay");
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const osmUrl = "https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png";
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const osmOpts = { attribution: "OpenStreetMap" };
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const maps = {
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s2: L.map("s2map").setView([47.27, 11.39], 12).addLayer(L.tileLayer(osmUrl, osmOpts)),
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s3: L.map("s3map").setView([47.27, 11.39], 12).addLayer(L.tileLayer(osmUrl, osmOpts))
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};
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const overlays = { s2: null, s3: null };
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let timeseries = { s2: [], s3: [] };
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async function loadTimeseries() {
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const [s2, s3] = await Promise.all([
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fetch("../data/innsbruck/2024/ndvi/s2/timeseries.json").then(r => r.json()),
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fetch("../data/innsbruck/2024/ndvi/s3/timeseries.json").then(r => r.json())
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]);
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timeseries = { s2, s3 };
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drawTimeseries();
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}
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function drawTimeseries() {
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const currentDate = dateFromDays(parseInt(slider.value));
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for (const source of ["s2", "s3"]) {
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const canvas = document.getElementById(`${source}timeseries`);
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const ctx = canvas.getContext("2d");
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canvas.width = canvas.offsetWidth;
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canvas.height = 120;
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const w = canvas.width, h = canvas.height;
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const pad = 30;
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const plotW = w - pad * 2, plotH = h - pad * 2;
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ctx.clearRect(0, 0, w, h);
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const data = timeseries[source].filter(t => t.ndvi !== null);
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if (!data.length) continue;
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const dates = data.map(t => new Date(t.date));
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const minDate = new Date(Math.min(...dates));
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const maxDate = new Date(Math.max(...dates));
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const dateRange = maxDate - minDate;
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const ndvi = data.map(t => t.ndvi);
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const minNdvi = Math.min(...ndvi);
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const maxNdvi = Math.max(...ndvi);
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const ndviRange = maxNdvi - minNdvi;
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const x = (d) => pad + ((new Date(d) - minDate) / dateRange) * plotW;
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const y = (v) => pad + plotH - ((v - minNdvi) / ndviRange) * plotH;
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ctx.strokeStyle = "#ccc";
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ctx.beginPath();
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ctx.moveTo(pad, pad);
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ctx.lineTo(pad, pad + plotH);
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ctx.lineTo(pad + plotW, pad + plotH);
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ctx.stroke();
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ctx.fillStyle = "#000";
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ctx.font = "9px sans-serif";
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ctx.fillText(minNdvi.toFixed(2), 2, pad + plotH + 10);
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ctx.fillText(maxNdvi.toFixed(2), 2, pad + 3);
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ctx.strokeStyle = source === "s2" ? "#0066ff" : "#ff6600";
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ctx.beginPath();
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let first = true;
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for (const t of data) {
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const px = x(t.date), py = y(t.ndvi);
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if (first) { ctx.moveTo(px, py); first = false; }
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else ctx.lineTo(px, py);
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}
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ctx.stroke();
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const xPos = x(currentDate);
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ctx.strokeStyle = "#f00";
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ctx.lineWidth = 2;
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ctx.beginPath();
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ctx.moveTo(xPos, pad);
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ctx.lineTo(xPos, pad + plotH);
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ctx.stroke();
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}
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}
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async function findFile(dateStr, source) {
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const target = new Date(dateStr);
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for (let offset = 0; offset < 15; offset++) {
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for (const dir of [0, -1, 1]) {
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const d = new Date(target);
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d.setDate(d.getDate() + offset * dir);
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const date = d.toISOString().split("T")[0].replace(/-/g, "");
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for (let i = 0; i < 3; i++) {
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const filename = `${date}_${i}.geotiff`;
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try {
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const res = await fetch(`../data/innsbruck/2024/${source}/${filename}`);
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if (res.ok) return filename;
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} catch {}
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}
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}
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}
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return null;
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}
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function transformBounds(bbox, fromCRS) {
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const [sw, ne] = [proj4(fromCRS, "EPSG:4326", [bbox[0], bbox[1]]), proj4(fromCRS, "EPSG:4326", [bbox[2], bbox[3]])];
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return [[sw[1], sw[0]], [ne[1], ne[0]]];
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}
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async function loadGeotiff(source, filename) {
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const tiff = await GeoTIFF.fromArrayBuffer(await (await fetch(`../data/innsbruck/2024/${source}/${filename}`)).arrayBuffer());
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const image = await tiff.getImage();
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const rasters = await image.readRasters();
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const width = image.getWidth();
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const height = image.getHeight();
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const bbox = image.getBoundingBox();
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const geoKeys = image.getGeoKeys();
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const crsCode = geoKeys.ProjectedCSTypeGeoKey ? `EPSG:${geoKeys.ProjectedCSTypeGeoKey}` :
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geoKeys.GeographicTypeGeoKey !== 4326 ? `EPSG:${geoKeys.GeographicTypeGeoKey}` : "EPSG:4326";
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const bandIndices = [0, 1, 2];
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const [blue, green, red] = bandIndices.map(i => Array.from(rasters[i]));
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const normalize = (arr) => {
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let min = Infinity, max = -Infinity;
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for (const v of arr) if (!isNaN(v) && v > 0) { min = Math.min(min, v); max = Math.max(max, v); }
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return arr.map(v => Math.max(0, Math.min(255, ((v - min) / (max - min || 1)) * 255)));
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};
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const [rNorm, gNorm, bNorm] = [red, green, blue].map(normalize);
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const canvas = Object.assign(document.createElement("canvas"), { width, height });
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const ctx = canvas.getContext("2d");
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ctx.imageSmoothingEnabled = false;
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const imgData = ctx.createImageData(width, height);
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for (let i = 0; i < rNorm.length; i++) {
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const idx = i * 4;
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if (rNorm[i] === 0 && gNorm[i] === 0 && bNorm[i] === 0) {
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imgData.data[idx + 3] = 0;
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} else {
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imgData.data[idx] = rNorm[i];
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imgData.data[idx + 1] = gNorm[i];
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imgData.data[idx + 2] = bNorm[i];
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imgData.data[idx + 3] = 255;
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}
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}
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ctx.putImageData(imgData, 0, 0);
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const bounds = crsCode === "EPSG:4326" ? [[bbox[1], bbox[0]], [bbox[3], bbox[2]]] : transformBounds(bbox, crsCode);
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if (overlays[source]) maps[source].removeLayer(overlays[source]);
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overlays[source] = L.imageOverlay(canvas.toDataURL(), bounds, { opacity: 0.7 }).addTo(maps[source]);
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maps[source].fitBounds(bounds);
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}
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const fmtDate = (d) => `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, "0")}-${String(d.getDate()).padStart(2, "0")}`;
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const dateFromDays = (days) => fmtDate(new Date(start.getTime() + days * 86400000));
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const daysFromDate = (dateStr) => {
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const [y, m, d] = dateStr.split("-").map(Number);
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return Math.floor((new Date(y, m - 1, d) - start) / 86400000);
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};
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async function updateImages() {
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const date = dateFromDays(parseInt(slider.value));
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dateDisplay.textContent = date;
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history.replaceState({}, "", `?date=${date}`);
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drawTimeseries();
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for (const source of ["s2", "s3"]) {
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const filename = await findFile(date, source);
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if (filename) {
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try {
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await loadGeotiff(source, filename);
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} catch (e) {
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console.error(`Error loading ${source}:`, e);
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}
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}
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}
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}
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const urlDate = new URLSearchParams(location.search).get("date");
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if (urlDate) slider.value = daysFromDate(urlDate);
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slider.addEventListener("input", updateImages);
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loadTimeseries().then(updateImages);
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</script>
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</body>
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</html>
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