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ndvi.html
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<html>
<head>
<meta charset="utf-8" />
<meta
name="viewport"
content="initial-scale=1,maximum-scale=1,user-scalable=no"
/>
<title>Client side raster function support</title>
<link
rel="stylesheet"
type="text/css"
href="https://js.arcgis.com/calcite-components/1.0.7/calcite.css"
/>
<script
type="module"
src="https://js.arcgis.com/calcite-components/1.0.7/calcite.esm.js"
></script>
<!-- <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.7.0/styles/a11y-light.min.css" integrity="sha512-WDk6RzwygsN9KecRHAfm9HTN87LQjqdygDmkHSJxVkVI7ErCZ8ZWxP6T8RvBujY1n2/E4Ac+bn2ChXnp5rnnHA==" crossorigin="anonymous" referrerpolicy="no-referrer" /> -->
<!-- <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.7.0/styles/intellij-light.min.css" integrity="sha512-rxoFrVtnfvSuel468Qr3r4djCRmFKs4DiJXUnOeaA/+uac9DkEOTEhfkcwUNiGTiA4jr6pBvXk6leEhweuGaVg==" crossorigin="anonymous" referrerpolicy="no-referrer" /> -->
<link
rel="stylesheet"
href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.7.0/styles/atom-one-light.min.css"
/>
<script src="//cdnjs.cloudflare.com/ajax/libs/highlight.js/11.7.0/highlight.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.9.1/chart.min.js"></script>
<link
rel="stylesheet"
href="https://jsdev.arcgis.com/4.26/esri/themes/light/main.css"
/>
<script src="https://jsdev.arcgis.com/4.26/"></script>
<style>
html,
body {
padding: 0;
margin: 0;
height: 100%;
width: 100%;
}
.content {
display: flex;
flex-direction: column;
align-items: stretch;
padding: 0;
margin: 0;
height: 100%;
width: 100%;
}
#viewDiv {
flex-grow: 1;
}
#chartDiv {
padding: 10px;
width: 360px;
}
/**
* Hover tooltip
*/
.tooltip {
position: absolute;
pointer-events: none;
transition: opacity 200ms;
opacity: 0;
}
.tooltip > div {
margin: 0 auto;
padding: 12px;
border-radius: 4px;
box-shadow: 0px 1px 2px rgb(0 0 0 / 30%);
transform: translate3d(-110%, -110%, 0);
backdrop-filter: blur(24px);
background-color: #ffffffaa;
z-index: 9999;
}
.esri-expand__content {
background-color: white;
}
.codeblock {
padding: 0;
margin: 0;
}
.codeblock > code {
white-space: pre-wrap;
overflow: auto;
font-size: 22px;
}
.hljs {
background: inherit;
}
</style>
</head>
<body>
<calcite-shell>
<calcite-panel heading="Raster Functions: NDVI example">
<div class="content">
<div id="viewDiv"></div>
</div>
</calcite-panel>
</calcite-shell>
</body>
<div
id="chartDiv"
class="esri-widget"
style="
display: flex;
flex-direction: column;
align-items: center;
justify-content: stretch;
"
>
<div style="display: flex; flex-direction: column; align-items: center">
<span
style="
font-size: 11px;
color: #666666;
font-weight: bolder;
font-family: Arial;
"
>NDVI</span
>
<span
id="ndviValueDiv"
style="
font-size: 36px;
padding-top: 12px;
font-weight: bold;
color: #309100;
padding-bottom: 8px;
font-variant-numeric: tabular-nums;
"
></span>
</div>
<canvas
id="spectral-chart"
height="300"
width="360"
class="esri-widget"
></canvas>
</div>
<calcite-panel id="codeDiv">
<div style="padding: 12px">
<calcite-block open>
<pre class="codeblock"><code class="language-javascript">const ndvi = new RasterFunction({
functionName: "NDVI",
functionArguments: {
visibleBandID: 3, // Red band id
infraredBandID: 4, // NIR band id
scientificOutput: false
}
});
const colormap = new RasterFunction({
functionName: "Colormap",
functionArguments: {
colormapName: NDVI3,
raster: ndvi
}
});
layer.rasterFunction = colormap;
</code></pre>
<calcite-fab
id="runButton"
kind="brand"
icon="play-f"
scale="l"
style="right: 12px; bottom: 12px; position: absolute"
></calcite-fab>
</calcite-block>
</div>
</calcite-panel>
<script>
require([
"esri/intl",
"esri/Map",
"esri/views/MapView",
"esri/layers/support/RasterFunction",
"esri/layers/support/rasterFunctionConstants",
"esri/layers/GraphicsLayer",
"esri/layers/ImageryTileLayer",
"esri/Graphic",
"esri/core/promiseUtils",
"esri/widgets/Expand",
], (
intl,
Map,
MapView,
RasterFunction,
rasterFunctionConstants,
GraphicsLayer,
ImageryTileLayer,
Graphic,
promiseUtils,
Expand
) =>
(async () => {
// useful links
// scientific index outputs values between -1.0 and 1.0, which represents vegetation density and vigor. Negative values are mainly generated from clouds, water, and snow, and values near zero are mainly generated from rock and bare soil. Very low values (0.1 and below) of NDVI correspond to barren areas of rock, sand, or snow. Moderate values (0.2 to 0.3) represent shrub and grassland, while high values (0.6 to 0.8) indicate temperate and tropical rainforests.
// https://pro.arcgis.com/en/pro-app/latest/help/analysis/raster-functions/ndvi-function.htm
const url =
"https://tiledimageservices.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/Glacier_landsat_8/ImageServer";
const ndvi = new RasterFunction({
functionName: "NDVI",
functionArguments: {
visibleBandID: 3,
infraredBandID: 4,
scientificOutput: false, // when true -1 to 1
},
});
const colormap = new RasterFunction({
functionName: "Colormap",
functionArguments: {
colormapName: rasterFunctionConstants.colormapName.NDVI3,
raster: ndvi,
},
});
const layer = new ImageryTileLayer({
url,
// bandIds: [3, 2, 1],
// rasterFunction: colormap,
});
const map = new Map({
basemap: "topo-vector",
layers: [layer],
});
map.basemap.loadAll().then(() => {
map.basemap.baseLayers.forEach((layer) => {
layer.effect = "grayscale(1) opacity(0.5)";
});
});
view = new MapView({
container: "viewDiv",
map: map,
center: [-113.543, 48.6109],
scale: 349736,
constraints: {
snapToZoom: false,
},
});
// view.ui.add(
// new Expand({
// expandIconClass: "esri-icon-menu", // see https://developers.arcgis.com/javascript/latest/guide/esri-icon-font/
// // expandTooltip: "Expand LayerList", // optional, defaults to "Expand" for English locale
// view: view,
// content: document.getElementById("codeDiv"),
// }),
// "top-right"
// );
view.ui.add(document.getElementById("codeDiv"), "top-right");
view.whenLayerView(layer).then(() => {
view.goTo(layer.fullExtent.clone().expand(1.1));
});
const spectralCanvas = document.getElementById("spectral-chart");
const chart = createSpectralChart(spectralCanvas);
const runButton = document.getElementById("runButton");
runButton.addEventListener("click", () => {
view.ui.add(document.getElementById("chartDiv"), "bottom-left");
layer.bandIds = null;
layer.rasterFunction = colormap;
// const tooltip = createTooltip();
// tooltip.hasData = false;
// tooltip.appendContent(document.getElementById("chartDiv"));
const debouncedUpdate = promiseUtils.debounce(async (event) => {
const point = view.toMap({ x: event.x, y: event.y });
const results = await layer.identify(point);
if (results.value) {
chart.data.datasets[0].data = results.value;
chart.update(0);
// tooltip.hasData = true;
document.getElementById("ndviValueDiv").innerHTML =
intl.formatNumber((results.processedValue - 100) / 100, {
minimumFractionDigits: 2,
});
} else {
// tooltip.hasData = false;
}
});
let graphic = new Graphic({
symbol: {
type: "simple-marker",
color: "red",
size: "12px",
outline: {
color: "rgba(128, 0, 0, 0.5)",
width: "6px",
},
},
});
map.layers.add(
new GraphicsLayer({
graphics: [graphic],
effect: "drop-shadow(0px 1px 2px rgb(0, 0, 0, 30%))",
})
);
let ctrl = new AbortController();
view.on("pointer-leave", (event) => {
// tooltip.enabled = false;
graphic.visible = false;
});
view.on("pointer-enter", (event) => {
// tooltip.enabled = true;
graphic.visible = true;
});
view.on("pointer-move", (event) => {
// tooltip.move({ x: event.x, y: event.y });
graphic.geometry = view.toMap({ x: event.x, y: event.y });
debouncedUpdate(event).catch((error) => {
if (!promiseUtils.isAbortError(error)) {
throw error;
}
});
});
});
function createSpectralChart(canvas) {
return new Chart(canvas.getContext("2d"), {
type: "line",
data: {
labels: [
"Coastal - 0.45",
"Blue - 0.51",
"Green - 0.59",
"Red - 0.67",
"NIR - 0.88",
"SWIR1 - 1.65",
"SWIR2 - 2.229",
"Cirrus - 1.38",
],
datasets: [
{
borderColor: "rgb(75, 192, 192)",
tension: 0.1,
},
],
},
options: {
scales: {
yAxis: {
title: {
display: true,
text: "Digital Number",
},
min: 4500,
max: 22000,
},
x: {
title: {
display: true,
text: "Band Ids - wavelength (micrometer)",
},
grid: {
color(context) {
switch(context.tick.value) {
case 3:
case 4:
return "rgb(255, 99, 132)";
default:
return Chart.defaults.borderColor
}
}
},
ticks: {
font(context) {
switch(context.tick.value) {
case 3:
case 4:
return {
size: 14,
weight: "bolder"
};
default:
return Chart.defaults.font
}
}
}
},
},
plugins: {
legend: {
display: false,
},
title: {
display: true,
text: "Spectral profile",
},
},
},
});
}
function createTooltip() {
const tooltip = document.createElement("div");
const style = tooltip.style;
tooltip.setAttribute("role", "tooltip");
tooltip.classList.add("tooltip");
const textElement = document.createElement("div");
textElement.classList.add("esri-widget");
tooltip.appendChild(textElement);
view.surface.insertBefore(tooltip, view.surface.children[0]);
let x = null;
let y = null;
let targetX = 0;
let targetY = 0;
let enabled = false;
let hasData = false;
// move the tooltip progressively
function move() {
x += (targetX - x) * 0.1;
y += (targetY - y) * 0.1;
if (Math.abs(targetX - x) < 1 && Math.abs(targetY - y) < 1) {
x = targetX;
y = targetY;
} else {
requestAnimationFrame(move);
}
style.transform =
"translate3d(" + Math.round(x) + "px," + Math.round(y) + "px, 0)";
}
function updateVisibility() {
if (hasData && enabled) {
style.opacity = 1;
} else {
style.opacity = 0;
}
}
return {
move(point) {
if (!enabled || x === null) {
x = point.x;
y = point.y;
}
targetX = point.x;
targetY = point.y;
move();
},
setContent: (text) => {
textElement.innerHTML = text;
},
appendContent(content) {
textElement.appendChild(content);
},
set enabled(value) {
enabled = value;
updateVisibility();
},
set hasData(value) {
hasData = value;
updateVisibility();
},
};
}
hljs.highlightAll();
})());
</script>
</html>