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It internally implements Gaussian Kernel Density Estimation to render heatmaps. Note that this layer does not support all platforms; see "limitations" section below."><meta data-rh="true" property="og:description" content="HeatmapLayer can be used to visualize spatial distribution of data. It internally implements Gaussian Kernel Density Estimation to render heatmaps. 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itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item">API Reference<meta itemprop="position" content="1"></li><li class="breadcrumbs__item">Layers<meta itemprop="position" content="2"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active">HeatmapLayer<meta itemprop="position" content="3"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h1>HeatmapLayer</h1><div class="demo-base__DemoPlaceholder-sc-bhdrci-0 djecNU"><div class="demo-base__DemoContainer-sc-bhdrci-1 jGCMrh"><div id="deckgl-wrapper" style="position:absolute;z-index:0;left:0;top:0;width:100%;height:100%"><canvas id="deckgl-overlay" style="left:0;top:0"></canvas></div></div><div class="demo-base__DemoSourceLink-sc-bhdrci-2 ciZnDn"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M0 0h24v24H0V0z" fill="none"></path><path fill="currentcolor" d="M9.4 16.6L4.8 12l4.6-4.6L8 6l-6 6 6 6 1.4-1.4zm5.2 0l4.6-4.6-4.6-4.6L16 6l6 6-6 6-1.4-1.4z"></path></svg>Edit on Codepen</div></div><code>HeatmapLayer</code> can be used to visualize spatial distribution of data. It internally implements <a href="https://en.wikipedia.org/wiki/Kernel%20%28statistics%29#Kernel_functions_in_common_use" target="_blank" rel="noopener noreferrer">Gaussian Kernel Density Estimation</a> to render heatmaps. Note that this layer does not support all platforms; see "limitations" section below.<div class="tabs-container tabList__CuJ"><ul role="tablist" aria-orientation="horizontal" class="tabs"><li role="tab" tabindex="0" aria-selected="true" class="tabs__item tabItem_LNqP tabs__item--active">JavaScript</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_LNqP">TypeScript</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_LNqP">React</li></ul><div class="margin-top--md"><div role="tabpanel" class="tabItem_Ymn6"><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-js codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv">import {Deck} from '@deck.gl/core'; import {HeatmapLayer} from '@deck.gl/aggregation-layers'; const layer = new HeatmapLayer({ id: 'HeatmapLayer', data: 'https://raw.githubusercontent.com/visgl/deck.gl-data/master/website/sf-bike-parking.json', aggregation: 'SUM', getPosition: d => d.COORDINATES, getWeight: d => d.SPACES, radiusPixels: 25 }); new Deck({ initialViewState: { longitude: -122.4, latitude: 37.74, zoom: 11 }, controller: true, layers: [layer] }); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div></div><div role="tabpanel" class="tabItem_Ymn6" hidden=""><div class="language-ts codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-ts codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv">import {Deck} from '@deck.gl/core'; import {HeatmapLayer} from '@deck.gl/aggregation-layers'; type BikeRack = { ADDRESS: string; SPACES: number; COORDINATES: [longitude: number, latitude: number]; }; const layer = new HeatmapLayer<BikeRack>({ id: 'HeatmapLayer', data: 'https://raw.githubusercontent.com/visgl/deck.gl-data/master/website/sf-bike-parking.json', aggregation: 'SUM', getPosition: (d: BikeRack) => d.COORDINATES, getWeight: (d: BikeRack) => d.SPACES, radiusPixels: 25 }); new Deck({ initialViewState: { longitude: -122.4, latitude: 37.74, zoom: 11 }, controller: true, layers: [layer] }); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div></div><div role="tabpanel" class="tabItem_Ymn6" hidden=""><div class="language-tsx codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-tsx codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv">import React from 'react'; import DeckGL from '@deck.gl/react'; import {HeatmapLayer} from '@deck.gl/aggregation-layers'; type BikeRack = { ADDRESS: string; SPACES: number; COORDINATES: [longitude: number, latitude: number]; }; function App() { const layer = new HeatmapLayer<BikeRack>({ id: 'HeatmapLayer', data: 'https://raw.githubusercontent.com/visgl/deck.gl-data/master/website/sf-bike-parking.json', aggregation: 'SUM', getPosition: (d: BikeRack) => d.COORDINATES, getWeight: (d: BikeRack) => d.SPACES, radiusPixels: 25 }); return <DeckGL initialViewState={{ longitude: -122.4, latitude: 37.74, zoom: 11 }} controller layers={[layer]} />; } </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div></div></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="installation">Installation<a href="#installation" class="hash-link" aria-label="Direct link to Installation" title="Direct link to Installation"></a></h2>To install the dependencies from NPM:<div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv">npm install deck.gl # or npm install @deck.gl/core @deck.gl/layers @deck.gl/aggregation-layers </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div><div class="language-ts codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-ts codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv">import {HeatmapLayer} from '@deck.gl/aggregation-layers'; import type {HeatmapLayerProps} from '@deck.gl/aggregation-layers'; new HeatmapLayer<DataT>(...props: HeatmapLayerProps<DataT>[]); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div>To use pre-bundled scripts:<div class="language-html codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-html codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><script src="https://unpkg.com/deck.gl@^9.0.0/dist.min.js"></script>  <script src="https://unpkg.com/@deck.gl/core@^9.0.0/dist.min.js"></script> <script src="https://unpkg.com/@deck.gl/layers@^9.0.0/dist.min.js"></script> <script src="https://unpkg.com/@deck.gl/aggregation-layers@^9.0.0/dist.min.js"></script> </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-js codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv">new deck.HeatmapLayer({}); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="properties">Properties<a href="#properties" class="hash-link" aria-label="Direct link to Properties" title="Direct link to Properties"></a></h2>Inherits from all <a href="/docs/api-reference/core/layer">Base Layer</a> and <a href="/docs/api-reference/core/composite-layer">CompositeLayer</a> properties.<h3 class="anchor anchorWithStickyNavbar_LWe7" id="render-options">Render Options<a href="#render-options" class="hash-link" aria-label="Direct link to Render Options" title="Direct link to Render Options"></a></h3><h4 class="anchor anchorWithStickyNavbar_LWe7" id="radiuspixels"><code>radiusPixels</code> (number, optional) <img loading="lazy" src="https://img.shields.io/badge/transition-enabled-green.svg?style=flat-square%22" alt="transition-enabled" class="img_ev3q"><a href="#radiuspixels" class="hash-link" aria-label="Direct link to radiuspixels" title="Direct link to radiuspixels"></a></h4><ul><li>Default: <code>30</code></li></ul>Radius of the circle in pixels, to which the weight of an object is distributed.<h4 class="anchor anchorWithStickyNavbar_LWe7" id="colorrange"><code>colorRange</code> (Color[], optional)<a href="#colorrange" class="hash-link" aria-label="Direct link to colorrange" title="Direct link to colorrange"></a></h4><ul><li>Default: <a href="http://colorbrewer2.org/#type=sequential&scheme=YlOrRd&n=6" target="_blank" rel="noopener noreferrer">colorbrewer</a> <code>6-class YlOrRd</code> <img loading="lazy" src="https://deck.gl/images/colorbrewer_YlOrRd_6.png" class="img_ev3q"></li></ul>The color palette used in the heatmap, as an array of colors [color1, color2, ...]. Each color is in the format of <code>[r, g, b, [a]]</code>. Each channel is a number between 0-255 and <code>a</code> is 255 if not supplied.See the <code>colorDomain</code> section below for how weight values are mapped to colors in <code>colorRange</code>.<h4 class="anchor anchorWithStickyNavbar_LWe7" id="intensity"><code>intensity</code> (number, optional) <img loading="lazy" src="https://img.shields.io/badge/transition-enabled-green.svg?style=flat-square%22" alt="transition-enabled" class="img_ev3q"><a href="#intensity" class="hash-link" aria-label="Direct link to intensity" title="Direct link to intensity"></a></h4><ul><li>Default: <code>1</code></li></ul>Value that is multiplied with the total weight at a pixel to obtain the final weight. A value larger than <code>1</code> biases the output color towards the higher end of the spectrum, and a value less than <code>1</code> biases the output color towards the lower end of the spectrum.<h4 class="anchor anchorWithStickyNavbar_LWe7" id="threshold"><code>threshold</code> (number, optional) <img loading="lazy" src="https://img.shields.io/badge/transition-enabled-green.svg?style=flat-square%22" alt="transition-enabled" class="img_ev3q"><a href="#threshold" class="hash-link" aria-label="Direct link to threshold" title="Direct link to threshold"></a></h4><ul><li>Default: <code>0.05</code></li></ul>The <code>HeatmapLayer</code> reduces the opacity of the pixels with relatively low weight to create a fading effect at the edge. A larger <code>threshold</code> smoothens the boundaries of color blobs, while making pixels with low relative weight harder to spot (due to low alpha value).<code>threshold</code> is defined as the ratio of the fading weight to the max weight, between <code>0</code> and <code>1</code>. For example, <code>0.1</code> affects all pixels with weight under 10% of the max.<code>threshold</code> is ignored when <code>colorDomain</code> is specified.<h4 class="anchor anchorWithStickyNavbar_LWe7" id="colordomain"><code>colorDomain</code> (number[2], optional) <img loading="lazy" src="https://img.shields.io/badge/transition-enabled-green.svg?style=flat-square%22" alt="transition-enabled" class="img_ev3q"><a href="#colordomain" class="hash-link" aria-label="Direct link to colordomain" title="Direct link to colordomain"></a></h4><ul><li>Default: <code>null</code></li></ul>Controls how weight values are mapped to the <code>colorRange</code>, as an array of two numbers [<code>minValue</code>, <code>maxValue</code>].When <code>colorDomain</code> is specified, a pixel with <code>minValue</code> is assigned the first color in <code>colorRange</code>, a pixel with <code>maxValue</code> is assigned the last color in <code>colorRange</code>, and any value in between is linearly interpolated. Pixels with weight less than <code>minValue</code> gradually fade out by reducing alpha, until 100% transparency representing <code>0</code>. Pixels with weight more than <code>maxValue</code> are capped to the last color in <code>colorRange</code>.<ul><li>If using <code>aggregation: 'SUM'</code>, values in <code>colorDomain</code> are interpreted as weight per square meter.</li><li>If using <code>aggregation: 'MEAN'</code>, values in <code>colorDomain</code> are interpreted as weight.</li></ul>When this prop is not specified, the maximum value is automatically determined from the current viewport, and the domain is set to [<code>maxValue * threshold</code>, <code>maxValue</code>]. This default behavior ensures that the colors are distributed somewhat reasonably regardless of the data in display. However, as a result, the color at a specific location is dependent on the current viewport and any other data points within view. To obtain a stable color mapping (e.g. for displaying a legend), you need to provide a custom <code>colorDomain</code>.<h4 class="anchor anchorWithStickyNavbar_LWe7" id="aggregation"><code>aggregation</code> (string, optional)<a href="#aggregation" class="hash-link" aria-label="Direct link to aggregation" title="Direct link to aggregation"></a></h4><ul><li>Default: <code>'SUM'</code></li></ul>Operation used to aggregate all data point weights to calculate a pixel's color value. One of <code>'SUM'</code> or <code>'MEAN'</code>. <code>'SUM'</code> is used when an invalid value is provided.The weight of each data object is distributed to all the pixels in a circle centered at the object position. The weight that a pixel receives is inversely proportional to its distance from the center. In <code>'SUM'</code> mode, pixels that fall into multiple circles will have the sum of all weights. In <code>'MEAN'</code> mode, pixels that fall into multiple circles will have their weight calculated as the weighted average from all the neighboring data points. And the weight of the pixel determines its color. <h4 class="anchor anchorWithStickyNavbar_LWe7" id="weightstexturesize"><code>weightsTextureSize</code> (number, optional)<a href="#weightstexturesize" class="hash-link" aria-label="Direct link to weightstexturesize" title="Direct link to weightstexturesize"></a></h4><ul><li>Default: <code>2048</code></li></ul><code>weightsTextureSize</code> specifies the size of weight texture. Smaller texture sizes can improve rendering performance. Heatmap aggregation calculates the maximum weight value in the texture and the process can take 50-100 ms for 2048x2048 texture, but only 5-7ms for 512x512 texture. Smaller texture sizes lead to visible pixelation.<h4 class="anchor anchorWithStickyNavbar_LWe7" id="debouncetimeout"><code>debounceTimeout</code> (number, optional)<a href="#debouncetimeout" class="hash-link" aria-label="Direct link to debouncetimeout" title="Direct link to debouncetimeout"></a></h4><ul><li>Default: <code>500</code></li></ul><code>debounceTimeout</code> is an interval in milliseconds during which changes to the viewport don't trigger aggregation. Large datasets combined with a large <code>radiusPixels</code> can cause freezes during user interactions due to aggregation updates. Setting positive debounceTimeout delays aggregation updates and prevents freezes during the interaction. As a side effect, the user has to wait to see updated results after the end of the interaction. <h3 class="anchor anchorWithStickyNavbar_LWe7" id="data-accessors">Data Accessors<a href="#data-accessors" class="hash-link" aria-label="Direct link to Data Accessors" title="Direct link to Data Accessors"></a></h3><h4 class="anchor anchorWithStickyNavbar_LWe7" id="getposition"><code>getPosition</code> (<a href="/docs/developer-guide/using-layers#accessors">Accessor<Position></a>, optional)<a href="#getposition" class="hash-link" aria-label="Direct link to getposition" title="Direct link to getposition"></a></h4><ul><li>Default: <code>object => object.position</code></li></ul>Method called to retrieve the position of each point.<h4 class="anchor anchorWithStickyNavbar_LWe7" id="getweight"><code>getWeight</code> (<a href="/docs/developer-guide/using-layers#accessors">Accessor<number></a>, optional)<a href="#getweight" class="hash-link" aria-label="Direct link to getweight" title="Direct link to getweight"></a></h4><ul><li>Default: <code>1</code></li></ul>Method called to retrieve weight of each point. By default each point will use a weight of <code>1</code>.<h2 class="anchor anchorWithStickyNavbar_LWe7" id="limitations">Limitations<a href="#limitations" class="hash-link" aria-label="Direct link to Limitations" title="Direct link to Limitations"></a></h2>The <code>HeatmapLayer</code> performs aggregation on the GPU. This feature is fully supported in evergreen desktop browsers, but limited in the following platforms due to partial WebGL support:<ul><li>iOS Safari: WebGL context does not support rendering to a float texture. The layer therefore falls back to an 8-bit low-precision mode, where weights must be integers and the accumulated weights in any pixel cannot exceed 255.</li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="source">Source<a href="#source" class="hash-link" aria-label="Direct link to Source" title="Direct link to Source"></a></h2><a href="https://github.com/visgl/deck.gl/tree/9.0-release/modules/aggregation-layers/src/heatmap-layer" target="_blank" rel="noopener noreferrer">modules/aggregation-layers/src/heatmap-layer</a></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/visgl/deck.gl/tree/master/website/../docs/api-reference/aggregation-layers/heatmap-layer.md" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 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