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<!DOCTYPE html>
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<p><img src="https://img.shields.io/npm/v/geoviz.png" class="img-fluid" alt="npm"> <img src="https://img.shields.io/jsdelivr/npm/hw/geoviz.png" class="img-fluid" alt="jsdeliver"> <img src="https://img.shields.io/badge/license-MIT-success.png" class="img-fluid" alt="license"> <img src="https://img.shields.io/github/languages/code-size/neocarto/geoviz.png" class="img-fluid" alt="code size"> <img src="https://img.shields.io/github/stars/neocarto/geoviz?style=social.png" class="img-fluid" alt="github stars"></p>
<section id="geoviz-javascript-library" class="level1">
<h1>Geoviz JavaScript library</h1>
<p><img src="img/logo.jpeg" width="300"></p>
<p><strong>Tags</strong> <code>#cartography</code> <code>#maps</code> <code>#geoviz</code> <code>#dataviz</code> <code>#JSspatial</code> <code>#Observable</code> <code>#FrontEndCartography</code></p>
<p><code>geoviz</code> is a JavaScript library for designing thematic maps. The library provides a set of <a href="https://github.com/d3/d3">d3</a> compatible functions that you can mix with the usual d3 syntax. The library is designed to be intuitive and concise. It allow to manage different geographic layers (points, lines, polygons) and marks (circles, labels, scale bar, title, north arrow, etc.) to design pretty maps. Its use is particularly well suited to Observable notebooks. Maps deigned with <code>geoviz</code> are:</p>
<p><img src="img/thematic.svg" style="height: 30px"> <img src="img/vectorial.svg" style="height: 30px"> <img src="img/interactive.svg" style="height: 30px"> <img src="img/interoperable.svg" style="height: 30px"> <img src="img/zoomable.svg" style="height: 30px"></p>
<p>🌏 live demo <a href="https://observablehq.com/@neocartocnrs/geoviz"><code>Observable notebook</code></a> <a href="examples/simple.html"><code>simple map</code></a> <a href="examples/choropleth.html"><code>choropleth</code></a> <a href="examples/typo.html"><code>typology</code></a> <a href="examples/bubble.html"><code>bubble</code></a> <a href="examples/dorling.html"><code>dorling</code></a> <a href="examples/tiles.html"><code>Mercator tiles</code></a></p>
<p>💻 Source code <a href="https://github.com/riatelab/geoviz"><code>github</code></a></p>
<p>💡 Suggestions/bugs <a href="https://github.com/riatelab/geoviz/issues"><code>issues</code></a></p>
<section id="installation" class="level2">
<h2 class="anchored" data-anchor-id="installation">Installation</h2>
<p>In the browser</p>
<div class="sourceCode" id="cb1"><pre class="sourceCode html code-with-copy"><code class="sourceCode html"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="dt"><</span><span class="kw">script</span><span class="ot"> src</span><span class="op">=</span><span class="st">"https://cdn.jsdelivr.net/npm/geoviz"</span><span class="ot"> charset</span><span class="op">=</span><span class="st">"utf-8"</span><span class="dt">></</span><span class="kw">script</span><span class="dt">></span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>In <a href="https://observablehq.com/">Observable</a> notebooks</p>
<div class="sourceCode" id="cb2"><pre class="sourceCode js code-with-copy"><code class="sourceCode javascript"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a>geoviz <span class="op">=</span> <span class="pp">require</span>(<span class="st">"geoviz"</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</section>
<section id="marks" class="level2">
<h2 class="anchored" data-anchor-id="marks">Marks</h2>
<p>The <code>geoviz</code> library provides several graphic marks that will allow you to draw your maps. circles, semi-circles, graticules, paths, scale, legends… Each mark has a specific function.</p>
<p>📚 <strong>Map marks</strong> <a href="global.html#path"><code>path()</code></a> <a href="global.html#circle"><code>circle()</code></a> <a href="global.html#square"><code>square()</code></a> <a href="global.html#halfcircle"><code>halfcircle()</code></a> <a href="global.html#spike"><code>spike()</code></a> <a href="global.html#tile"><code>tile()</code></a></p>
<p>📚 <strong>Layout marks</strong> <a href="global.html#header"><code>header()</code></a> <a href="global.html#footer"><code>footer()</code></a> <a href="global.html#graticule"><code>graticule()</code></a> <a href="global.html#outline"><code>outline()</code></a> <a href="global.html#north"><code>north()</code></a> <a href="global.html#scalebar"><code>scalebar()</code></a> <a href="global.html#text"><code>text()</code></a> <a href="global.html#rhumbs"><code>rhumbs()</code></a> <a href="global.html#tissot"><code>tissot()</code></a></p>
<p>📚 <strong>Legend marks</strong> <a href="global.html#legend/box"><code>legend.box()</code></a> <a href="global.html#legend/choro_horizontal"><code>legend.choro_horizontal()</code></a> <a href="global.html#legend/choro_vertical"><code>legend.choro_vertical()</code></a> <a href="global.html#legend/circles_half"><code>legend.circles_half()</code></a> <a href="global.html#legend/circles_nested"><code>legend.circles_nested()</code></a> <a href="global.html#legend/circles"><code>legend.circles()</code></a> <a href="global.html#legend/squares"><code>legend.squares()</code></a> <a href="global.html#legend/squares_nested"><code>legend.squares_nested()</code></a> <a href="global.html#legend/mushrooms"><code>legend.mushrooms()</code></a> <a href="global.html#legend/spikes"><code>legend.spikes()</code></a> <a href="global.html#legend/typo_horizontal"><code>legend.typo_horizontal()</code></a> <a href="global.html#legend/typo_vertical"><code>legend.typo_vertical()</code></a></p>
<p>For example:</p>
<div class="sourceCode" id="cb3"><pre class="sourceCode js code-with-copy"><code class="sourceCode javascript"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="co">// To display a geoJSON</span></span>
<span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a>viz<span class="op">.</span><span class="fu">path</span>({<span class="dt">data</span><span class="op">:</span> <span class="op">*</span>a geoJSON<span class="op">*</span>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<div class="sourceCode" id="cb4"><pre class="sourceCode js code-with-copy"><code class="sourceCode javascript"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a><span class="co">// World graticule</span></span>
<span id="cb4-2"><a href="#cb4-2" aria-hidden="true" tabindex="-1"></a>viz<span class="op">.</span><span class="fu">graticule</span>({<span class="dt">fill</span><span class="op">:</span> <span class="st">"#267A8A"</span>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<div class="sourceCode" id="cb5"><pre class="sourceCode js code-with-copy"><code class="sourceCode javascript"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a><span class="co">// A legend for choropleth maps</span></span>
<span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a>viz<span class="op">.</span><span class="fu">choro_horizontal</span>({<span class="dt">data</span><span class="op">:</span> <span class="op">*</span>an array <span class="kw">of</span> values<span class="op">*</span>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>🌏 live demo <a href="https://observablehq.com/@neocartocnrs/path-mark"><code>path</code></a> <a href="https://observablehq.com/@neocartocnrs/circle-mark"><code>circle</code></a> <a href="https://observablehq.com/@neocartocnrs/square-mark"><code>square</code></a> <a href="https://observablehq.com/@neocartocnrs/half-circle-mark"><code>halfcircle</code></a> <a href="https://observablehq.com/@neocartocnrs/spike-mark"><code>spike</code></a> <a href="https://observablehq.com/@neocartocnrs/text-mark"><code>text</code></a> <a href="https://observablehq.com/@neocartocnrs/tile-mark"><code>tile</code></a> <a href="https://observablehq.com/@neocartocnrs/legends"><code>legends</code></a></p>
</section>
<section id="container-and-render" class="level2">
<h2 class="anchored" data-anchor-id="container-and-render">Container and render</h2>
<p>To combine several marks into a single representation, we need to create an SVG container, add layers and display the result. In the container, you can specify the map size, projection, margins, etc.</p>
<p>See <a href="global.html#create"><code>create()</code></a> <a href="global.html#render"><code>render()</code></a></p>
<p>In Observable</p>
<div class="sourceCode" id="cb6"><pre class="sourceCode js code-with-copy"><code class="sourceCode javascript"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a>{</span>
<span id="cb6-2"><a href="#cb6-2" aria-hidden="true" tabindex="-1"></a><span class="kw">let</span> world <span class="op">=</span> <span class="cf">await</span> <span class="fu">FileAttachment</span>(<span class="st">"world.json"</span>)<span class="op">.</span><span class="fu">json</span>() <span class="co">// a geoJSON of world countries</span></span>
<span id="cb6-3"><a href="#cb6-3" aria-hidden="true" tabindex="-1"></a><span class="kw">let</span> svg <span class="op">=</span> geoviz<span class="op">.</span><span class="fu">create</span>({<span class="dt">projection</span><span class="op">:</span> d3<span class="op">.</span><span class="fu">geoEqualEarth</span>()}) <span class="co">// an SVG container</span></span>
<span id="cb6-4"><a href="#cb6-4" aria-hidden="true" tabindex="-1"></a>svg<span class="op">.</span><span class="fu">outline</span>({<span class="dt">fill</span><span class="op">:</span> <span class="st">"#267A8A"</span>})</span>
<span id="cb6-5"><a href="#cb6-5" aria-hidden="true" tabindex="-1"></a>svg<span class="op">.</span><span class="fu">graticule</span>({<span class="dt">stroke</span><span class="op">:</span> <span class="st">"white"</span><span class="op">,</span> <span class="dt">strokeWidth</span><span class="op">:</span> <span class="fl">0.4</span>})</span>
<span id="cb6-6"><a href="#cb6-6" aria-hidden="true" tabindex="-1"></a>svg<span class="op">.</span><span class="fu">path</span>({<span class="dt">data</span><span class="op">:</span> world<span class="op">,</span> <span class="dt">fill</span><span class="op">:</span> <span class="st">"#F8D993"</span><span class="op">,</span> <span class="dt">stroke</span><span class="op">:</span> <span class="st">"#ada9a6"</span><span class="op">,</span> <span class="dt">strokeWidth</span><span class="op">:</span><span class="fl">0.5</span><span class="op">,</span> <span class="dt">tip</span><span class="op">:</span>d <span class="kw">=></span> d<span class="op">.</span><span class="at">properties</span><span class="op">.</span><span class="at">NAMEen</span>})</span>
<span id="cb6-7"><a href="#cb6-7" aria-hidden="true" tabindex="-1"></a>svg<span class="op">.</span><span class="fu">header</span>({<span class="dt">fontSize</span><span class="op">:</span> <span class="dv">30</span><span class="op">,</span> <span class="dt">text</span><span class="op">:</span> <span class="st">"A Simple World Map"</span><span class="op">,</span> <span class="dt">fill</span><span class="op">:</span> <span class="st">"#267A8A"</span><span class="op">,</span> <span class="dt">fontWeight</span><span class="op">:</span> <span class="st">"bold"</span><span class="op">,</span> <span class="dt">fontFamily</span><span class="op">:</span> <span class="st">"Tangerine"</span>})</span>
<span id="cb6-8"><a href="#cb6-8" aria-hidden="true" tabindex="-1"></a><span class="cf">return</span> svg<span class="op">.</span><span class="fu">render</span>() <span class="co">// render</span></span>
<span id="cb6-9"><a href="#cb6-9" aria-hidden="true" tabindex="-1"></a>}</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>Same thing with Vanilla JavaScript</p>
<div class="sourceCode" id="cb7"><pre class="sourceCode js code-with-copy"><code class="sourceCode javascript"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a><span class="kw">let</span> world <span class="op">=</span> <span class="st">"./world.json"</span> <span class="co">// a geoJSON of world countries</span></span>
<span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a>d3<span class="op">.</span><span class="fu">json</span>(world)<span class="op">.</span><span class="fu">then</span>(data <span class="kw">=></span> {</span>
<span id="cb7-3"><a href="#cb7-3" aria-hidden="true" tabindex="-1"></a><span class="kw">let</span> svg <span class="op">=</span> geoviz<span class="op">.</span><span class="fu">create</span>({<span class="dt">projection</span><span class="op">:</span> d3<span class="op">.</span><span class="fu">geoEqualEarth</span>()}) <span class="co">// an SVG container</span></span>
<span id="cb7-4"><a href="#cb7-4" aria-hidden="true" tabindex="-1"></a>svg<span class="op">.</span><span class="fu">outline</span>({<span class="dt">fill</span><span class="op">:</span> <span class="st">"#267A8A"</span>})</span>
<span id="cb7-5"><a href="#cb7-5" aria-hidden="true" tabindex="-1"></a>svg<span class="op">.</span><span class="fu">graticule</span>({<span class="dt">stroke</span><span class="op">:</span> <span class="st">"white"</span><span class="op">,</span> <span class="dt">strokeWidth</span><span class="op">:</span> <span class="fl">0.4</span>})</span>
<span id="cb7-6"><a href="#cb7-6" aria-hidden="true" tabindex="-1"></a>svg<span class="op">.</span><span class="fu">path</span>({<span class="dt">data</span><span class="op">:</span> data<span class="op">,</span> <span class="dt">fill</span><span class="op">:</span> <span class="st">"#F8D993"</span><span class="op">,</span> <span class="dt">stroke</span><span class="op">:</span> <span class="st">"#ada9a6"</span><span class="op">,</span> <span class="dt">strokeWidth</span><span class="op">:</span><span class="fl">0.5</span><span class="op">,</span> <span class="dt">tip</span><span class="op">:</span>d <span class="kw">=></span> d<span class="op">.</span><span class="at">properties</span><span class="op">.</span><span class="at">NAMEen</span>})</span>
<span id="cb7-7"><a href="#cb7-7" aria-hidden="true" tabindex="-1"></a>svg<span class="op">.</span><span class="fu">header</span>({<span class="dt">fontSize</span><span class="op">:</span> <span class="dv">30</span><span class="op">,</span> <span class="dt">text</span><span class="op">:</span> <span class="st">"A Simple World Map"</span><span class="op">,</span> <span class="dt">fill</span><span class="op">:</span> <span class="st">"#267A8A"</span><span class="op">,</span> <span class="dt">fontWeight</span><span class="op">:</span> <span class="st">"bold"</span><span class="op">,</span> <span class="dt">fontFamily</span><span class="op">:</span> <span class="st">"Tangerine"</span>})</span>
<span id="cb7-8"><a href="#cb7-8" aria-hidden="true" tabindex="-1"></a><span class="bu">document</span><span class="op">.</span><span class="at">body</span><span class="op">.</span><span class="fu">appendChild</span>(svg<span class="op">.</span><span class="fu">render</span>()) <span class="co">// render</span></span>
<span id="cb7-9"><a href="#cb7-9" aria-hidden="true" tabindex="-1"></a>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>🌏 live demo <a href="https://observablehq.com/@neocartocnrs/containers"><code>containers</code></a> <a href="https://observablehq.com/@neocartocnrs/insets"><code>insets</code></a></p>
</section>
<section id="svg-filters" class="level2">
<h2 class="anchored" data-anchor-id="svg-filters">SVG filters</h2>
<p>Design Attractive maps is important. That’s why the geoviz library also lets you easily add SVG effects to your map.</p>
<p>📚 <strong>Effects</strong> <a href="global.html#effect/blur"><code>effect.blur()</code></a> <a href="global.html#effect/clipPath"><code>effect.clipPath()</code></a> <a href="global.html#effect/radialGradient"><code>effect.radialGradient()</code></a> <a href="global.html#effect/shadow"><code>effect.shadow()</code></a></p>
<p>🌏 live demo <a href="https://observablehq.com/@neocartocnrs/effect"><code>effects</code></a> <a href="https://observablehq.com/@neocartocnrs/layout-marks"><code>layout</code></a></p>
</section>
<section id="the-plot-function" class="level2">
<h2 class="anchored" data-anchor-id="the-plot-function">The plot function</h2>
<p>The <code>plot()</code> function in allows you to call up all the layer types available in the library via a single function. It is the main function of the library.</p>
<p>See <a href="global.html#plot"><code>plot()</code></a></p>
<p>We can rewrite the previous example.</p>
<div class="sourceCode" id="cb8"><pre class="sourceCode js code-with-copy"><code class="sourceCode javascript"><span id="cb8-1"><a href="#cb8-1" aria-hidden="true" tabindex="-1"></a>{</span>
<span id="cb8-2"><a href="#cb8-2" aria-hidden="true" tabindex="-1"></a><span class="kw">let</span> world <span class="op">=</span> <span class="cf">await</span> <span class="fu">FileAttachment</span>(<span class="st">"world.json"</span>)<span class="op">.</span><span class="fu">json</span>() <span class="co">// a geoJSON of world countries</span></span>
<span id="cb8-3"><a href="#cb8-3" aria-hidden="true" tabindex="-1"></a><span class="kw">let</span> svg <span class="op">=</span> geoviz<span class="op">.</span><span class="fu">create</span>({<span class="dt">projection</span><span class="op">:</span> d3<span class="op">.</span><span class="fu">geoEqualEarth</span>()}) <span class="co">// an SVG container</span></span>
<span id="cb8-4"><a href="#cb8-4" aria-hidden="true" tabindex="-1"></a>svg<span class="op">.</span><span class="fu">plot</span>({<span class="dt">type</span><span class="op">:</span><span class="st">"outline"</span><span class="op">,</span> <span class="dt">fill</span><span class="op">:</span> <span class="st">"#267A8A"</span>})</span>
<span id="cb8-5"><a href="#cb8-5" aria-hidden="true" tabindex="-1"></a>svg<span class="op">.</span><span class="fu">plot</span>({<span class="dt">type</span><span class="op">:</span><span class="st">"graticule"</span><span class="op">,</span> <span class="dt">stroke</span><span class="op">:</span> <span class="st">"white"</span><span class="op">,</span> <span class="dt">strokeWidth</span><span class="op">:</span> <span class="fl">0.4</span>})</span>
<span id="cb8-6"><a href="#cb8-6" aria-hidden="true" tabindex="-1"></a>svg<span class="op">.</span><span class="fu">plot</span>({<span class="dt">type</span><span class="op">:</span><span class="st">"path"</span><span class="op">,</span> <span class="dt">data</span><span class="op">:</span> world<span class="op">,</span> <span class="dt">fill</span><span class="op">:</span> <span class="st">"#F8D993"</span><span class="op">,</span> <span class="dt">stroke</span><span class="op">:</span> <span class="st">"#ada9a6"</span><span class="op">,</span> <span class="dt">strokeWidth</span><span class="op">:</span><span class="fl">0.5</span><span class="op">,</span> <span class="dt">tip</span><span class="op">:</span>d <span class="kw">=></span> d<span class="op">.</span><span class="at">properties</span><span class="op">.</span><span class="at">NAMEen</span>})</span>
<span id="cb8-7"><a href="#cb8-7" aria-hidden="true" tabindex="-1"></a>svg<span class="op">.</span><span class="fu">plot</span>({<span class="dt">type</span><span class="op">:</span><span class="st">"header"</span><span class="op">,</span> <span class="dt">fontSize</span><span class="op">:</span> <span class="dv">30</span><span class="op">,</span> <span class="dt">text</span><span class="op">:</span> <span class="st">"A Simple World Map"</span><span class="op">,</span> <span class="dt">fill</span><span class="op">:</span> <span class="st">"#267A8A"</span><span class="op">,</span> <span class="dt">fontWeight</span><span class="op">:</span> <span class="st">"bold"</span><span class="op">,</span> <span class="dt">fontFamily</span><span class="op">:</span> <span class="st">"Tangerine"</span>})</span>
<span id="cb8-8"><a href="#cb8-8" aria-hidden="true" tabindex="-1"></a><span class="cf">return</span> svg<span class="op">.</span><span class="fu">render</span>() <span class="co">// render</span></span>
<span id="cb8-9"><a href="#cb8-9" aria-hidden="true" tabindex="-1"></a>}</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</section>
<section id="the-draw-function" class="level2">
<h2 class="anchored" data-anchor-id="the-draw-function">The draw function</h2>
<p>The <code>draw()</code> function is inspired by the <a href="https://observablehq.com/@neocartocnrs/hello-bertin-js?collection=@neocartocnrs/bertin"><code>bertin</code></a> library. It allows you to draw the entire map using a single function. As in <code>bertin</code>, all the necessary information is stored in a single JSON, containing general parameters and an array of objects describing the layers to be displayed and overlaid. <em>Under the wood, the function draw() use the <a href="https://riatelab.github.io/geoviz/global.html#plot"><code>plot()</code></a> function.</em></p>
<div class="sourceCode" id="cb9"><pre class="sourceCode js code-with-copy"><code class="sourceCode javascript"><span id="cb9-1"><a href="#cb9-1" aria-hidden="true" tabindex="-1"></a>geoviz<span class="op">.</span><span class="fu">draw</span>({</span>
<span id="cb9-2"><a href="#cb9-2" aria-hidden="true" tabindex="-1"></a> <span class="dt">layers</span><span class="op">:</span> [</span>
<span id="cb9-3"><a href="#cb9-3" aria-hidden="true" tabindex="-1"></a> { <span class="dt">type</span><span class="op">:</span> <span class="st">"outline"</span><span class="op">,</span> <span class="dt">fill</span><span class="op">:</span> <span class="st">"#267A8A"</span>}<span class="op">,</span></span>
<span id="cb9-4"><a href="#cb9-4" aria-hidden="true" tabindex="-1"></a> { <span class="dt">type</span><span class="op">:</span> <span class="st">"graticule"</span><span class="op">,</span> <span class="dt">stroke</span><span class="op">:</span> <span class="st">"white"</span><span class="op">,</span> <span class="dt">strokeWidth</span><span class="op">:</span> <span class="fl">0.4</span> }<span class="op">,</span></span>
<span id="cb9-5"><a href="#cb9-5" aria-hidden="true" tabindex="-1"></a> { <span class="dt">type</span><span class="op">:</span> <span class="st">"layer"</span><span class="op">,</span> <span class="dt">data</span><span class="op">:</span> world<span class="op">,</span> <span class="dt">fill</span><span class="op">:</span> <span class="st">"#F8D993"</span><span class="op">,</span> <span class="dt">stroke</span><span class="op">:</span> <span class="st">"#ada9a6"</span><span class="op">,</span> <span class="dt">strokeWidth</span><span class="op">:</span><span class="fl">0.5</span><span class="op">,</span> <span class="dt">tip</span><span class="op">:</span>d <span class="kw">=></span> d<span class="op">.</span><span class="at">properties</span><span class="op">.</span><span class="at">NAMEen</span> }<span class="op">,</span></span>
<span id="cb9-6"><a href="#cb9-6" aria-hidden="true" tabindex="-1"></a> {<span class="dt">type</span><span class="op">:</span> <span class="st">"header"</span><span class="op">,</span> <span class="dt">fontSize</span><span class="op">:</span> <span class="dv">30</span><span class="op">,</span> <span class="dt">text</span><span class="op">:</span> <span class="st">"A Simple World Map"</span><span class="op">,</span> <span class="dt">fill</span><span class="op">:</span> <span class="st">"#267A8A"</span><span class="op">,</span> <span class="dt">fontWeight</span><span class="op">:</span> <span class="st">"bold"</span><span class="op">,</span> <span class="dt">fontFamily</span><span class="op">:</span> <span class="st">"Tangerine"</span>}</span>
<span id="cb9-7"><a href="#cb9-7" aria-hidden="true" tabindex="-1"></a> ]</span>
<span id="cb9-8"><a href="#cb9-8" aria-hidden="true" tabindex="-1"></a>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</section>
<section id="statistical-cartography" class="level2">
<h2 class="anchored" data-anchor-id="statistical-cartography">Statistical cartography</h2>
<p>In addition of mapping static marks, the <code>plot()</code> and <code>draw()</code> functions lets you quickly create statistical maps (including legends) with very few parameters (and many others as options). Let’s see some examples.</p>
<section id="proportional-symbols" class="level3">
<h3 class="anchored" data-anchor-id="proportional-symbols">Proportional symbols</h3>
<p>By using <a href="global.html#plot/prop"><code>type = "prop"</code></a>, you can design a map with proportionnal symbols (“circle”, “square”, “halfcircle”,“spike”). Find below a minimal example.</p>
<div class="sourceCode" id="cb10"><pre class="sourceCode js code-with-copy"><code class="sourceCode javascript"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a>geoviz<span class="op">.</span><span class="fu">plot</span>({type <span class="op">=</span> <span class="st">"prop"</span><span class="op">,</span> data <span class="op">=</span> <span class="op">*</span>a geoJSON<span class="op">*,</span> <span class="kw">var</span> <span class="op">=</span> <span class="op">*</span>a field<span class="op">*</span>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>📚 <a href="global.html#plot/prop"><code>plot/prop()</code></a></p>
<p>🌏 live demo <a href="https://observablehq.com/@neocartocnrs/prop"><code>prop</code></a></p>
</section>
<section id="choropleth" class="level3">
<h3 class="anchored" data-anchor-id="choropleth">Choropleth</h3>
<p>By using <a href="global.html#plot/choro"><code>type = "choro"</code></a>, you can design a choropleth map. Find below a minimal example.</p>
<div class="sourceCode" id="cb11"><pre class="sourceCode js code-with-copy"><code class="sourceCode javascript"><span id="cb11-1"><a href="#cb11-1" aria-hidden="true" tabindex="-1"></a>geoviz<span class="op">.</span><span class="fu">plot</span>({type <span class="op">=</span> <span class="st">"choro"</span><span class="op">,</span> data <span class="op">=</span> <span class="op">*</span>a geoJSON<span class="op">*,</span> <span class="kw">var</span> <span class="op">=</span> <span class="op">*</span>a field<span class="op">*</span>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>📚 <a href="global.html#plot/choro"><code>plot/choro()</code></a></p>
<p>🌏 live demo <a href="https://observablehq.com/@neocartocnrs/choropleth"><code>choropleth</code></a></p>
</section>
<section id="typology" class="level3">
<h3 class="anchored" data-anchor-id="typology">Typology</h3>
<p>By using <a href="global.html#plot/typo"><code>type = "typo"</code></a>, you can design a qualitative typo map. Find below a minimal example.</p>
<div class="sourceCode" id="cb12"><pre class="sourceCode js code-with-copy"><code class="sourceCode javascript"><span id="cb12-1"><a href="#cb12-1" aria-hidden="true" tabindex="-1"></a>geoviz<span class="op">.</span><span class="fu">plot</span>({type <span class="op">=</span> <span class="st">"typo"</span><span class="op">,</span> data <span class="op">=</span> <span class="op">*</span>a geoJSON<span class="op">*,</span> <span class="kw">var</span> <span class="op">=</span> <span class="op">*</span>a field<span class="op">*</span>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>📚 <a href="global.html#plot/typo"><code>plot/typo()</code></a></p>
<p>🌏 live demo <a href="https://observablehq.com/@neocartocnrs/typo"><code>typology</code></a></p>
</section>
<section id="proportional-symbols-choropleth" class="level3">
<h3 class="anchored" data-anchor-id="proportional-symbols-choropleth">Proportional symbols + choropleth</h3>
<p>By using <a href="global.html#plot/propchoro"><code>type = "propchoro"</code></a>, you can design a map with proportionnal symbols with graduated colors. Find below a minimal example.</p>
<div class="sourceCode" id="cb13"><pre class="sourceCode js code-with-copy"><code class="sourceCode javascript"><span id="cb13-1"><a href="#cb13-1" aria-hidden="true" tabindex="-1"></a>geoviz<span class="op">.</span><span class="fu">plot</span>({type <span class="op">=</span> <span class="st">"propchoro"</span><span class="op">,</span> data <span class="op">=</span> <span class="op">*</span>a geoJSON<span class="op">*,</span> var1 <span class="op">=</span> <span class="op">*</span>a field<span class="op">*,</span> var2 <span class="op">=</span> <span class="op">*</span>a field<span class="op">*</span>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>📚 <a href="global.html#plot/propchoro"><code>plot/propchoro()</code></a></p>
<p>🌏 live demo <a href="https://observablehq.com/@neocartocnrs/prop"><code>prop</code></a></p>
</section>
<section id="proportional-symbols-typology" class="level3">
<h3 class="anchored" data-anchor-id="proportional-symbols-typology">Proportional symbols + typology</h3>
<p>By using <a href="global.html#plot/proptypo"><code>type = "proptypo"</code></a>, you can design a map with proportionnal symbols with qualitative colors. Find below a minimal example.</p>
<div class="sourceCode" id="cb14"><pre class="sourceCode js code-with-copy"><code class="sourceCode javascript"><span id="cb14-1"><a href="#cb14-1" aria-hidden="true" tabindex="-1"></a>geoviz<span class="op">.</span><span class="fu">plot</span>({type <span class="op">=</span> <span class="st">"proptypo"</span><span class="op">,</span> data <span class="op">=</span> <span class="op">*</span>a geoJSON<span class="op">*,</span> var1 <span class="op">=</span> <span class="op">*</span>a field<span class="op">*,</span> var2 <span class="op">=</span> <span class="op">*</span>a field<span class="op">*</span>})</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>📚 <a href="global.html#plot/proptypo"><code>plot/proptypo()</code></a></p>
<p>🌏 live demo <a href="https://observablehq.com/@neocartocnrs/prop"><code>prop</code></a></p>
</section>
</section>
<section id="interactivity" class="level2">
<h2 class="anchored" data-anchor-id="interactivity">Interactivity</h2>
<p>Maps created by geoviz are zoomable and interactive.</p>
<p>🌏 live demo <a href="https://observablehq.com/@neocartocnrs/tooltip"><code>tooltip</code></a> <a href="https://observablehq.com/@neocartocnrs/zooming"><code>pan and zoom</code></a> <a href="https://observablehq.com/@neocartocnrs/interactivity"><code>interactivity</code></a></p>
</section>
<section id="helpers" class="level2">
<h2 class="anchored" data-anchor-id="helpers">Helpers</h2>
<p>Finally, geoviz provides a toolbox of useful functions for cartography.</p>
<p>📚 <a href="global.html#tool/addonts"><code>tool.addfonts()</code></a> <a href="global.html#tool/centroid"><code>tool/centroid()</code></a> <a href="global.html#tool/choro"><code>tool.choro()</code></a> <a href="global.html#tool/typo"><code>tool.typo()</code></a> <a href="global.html#tool/dissolve"><code>tool.dissolve()</code></a> <a href="global.html#tool/dodge"><code>tool.dodge()</code></a> <a href="global.html#tool/featurecollection"><code>tool.featurecollection()</code></a> <a href="global.html#tool/geotable"><code>tool.geotable()</code></a> <a href="global.html#tool/rewind"><code>tool.rewind()</code></a> <a href="global.html#tool/merge"><code>tool.merge()</code></a> <a href="global.html#tool/proj4d3"><code>tool.proj4d3()</code></a> <a href="global.html#tool/project"><code>tool.project()</code></a> <a href="global.html#tool/unproject"><code>tool.unproject()</code></a> <a href="global.html#tool/replicate"><code>tool.replicate()</code></a> <a href="global.html#tool/ridge"><code>tool.ridge()</code></a> <a href="global.html#tool/random"><code>tool.random()</code></a> <a href="global.html#tool/radius"><code>tool.radius()</code></a></p>
<p>🌏 live demo <a href="https://observablehq.com/@neocartocnrs/handle-geometries"><code>Handle geometries</code></a></p>
</section>
</section>
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for (var i=0; i<noterefs.length; i++) {
const ref = noterefs[i];
tippyHover(ref, function() {
// use id or data attribute instead here
let href = ref.getAttribute('data-footnote-href') || ref.getAttribute('href');
try { href = new URL(href).hash; } catch {}
const id = href.replace(/^#\/?/, "");
const note = window.document.getElementById(id);
if (note) {
return note.innerHTML;
} else {
return "";
}
});
}
const xrefs = window.document.querySelectorAll('a.quarto-xref');
const processXRef = (id, note) => {
// Strip column container classes
const stripColumnClz = (el) => {
el.classList.remove("page-full", "page-columns");
if (el.children) {
for (const child of el.children) {
stripColumnClz(child);
}
}
}
stripColumnClz(note)
if (id === null || id.startsWith('sec-')) {
// Special case sections, only their first couple elements
const container = document.createElement("div");
if (note.children && note.children.length > 2) {
container.appendChild(note.children[0].cloneNode(true));
for (let i = 1; i < note.children.length; i++) {
const child = note.children[i];
if (child.tagName === "P" && child.innerText === "") {
continue;
} else {
container.appendChild(child.cloneNode(true));
break;
}
}
if (window.Quarto?.typesetMath) {
window.Quarto.typesetMath(container);
}
return container.innerHTML
} else {
if (window.Quarto?.typesetMath) {
window.Quarto.typesetMath(note);
}
return note.innerHTML;
}
} else {
// Remove any anchor links if they are present
const anchorLink = note.querySelector('a.anchorjs-link');
if (anchorLink) {
anchorLink.remove();
}
if (window.Quarto?.typesetMath) {
window.Quarto.typesetMath(note);
}
// TODO in 1.5, we should make sure this works without a callout special case
if (note.classList.contains("callout")) {
return note.outerHTML;
} else {
return note.innerHTML;
}
}
}
for (var i=0; i<xrefs.length; i++) {
const xref = xrefs[i];
tippyHover(xref, undefined, function(instance) {
instance.disable();
let url = xref.getAttribute('href');
let hash = undefined;
if (url.startsWith('#')) {
hash = url;
} else {
try { hash = new URL(url).hash; } catch {}
}
if (hash) {
const id = hash.replace(/^#\/?/, "");
const note = window.document.getElementById(id);
if (note !== null) {
try {
const html = processXRef(id, note.cloneNode(true));
instance.setContent(html);
} finally {
instance.enable();
instance.show();
}
} else {
// See if we can fetch this
fetch(url.split('#')[0])
.then(res => res.text())
.then(html => {
const parser = new DOMParser();
const htmlDoc = parser.parseFromString(html, "text/html");
const note = htmlDoc.getElementById(id);
if (note !== null) {
const html = processXRef(id, note);
instance.setContent(html);
}
}).finally(() => {
instance.enable();
instance.show();
});
}
} else {
// See if we can fetch a full url (with no hash to target)
// This is a special case and we should probably do some content thinning / targeting
fetch(url)
.then(res => res.text())
.then(html => {
const parser = new DOMParser();
const htmlDoc = parser.parseFromString(html, "text/html");
const note = htmlDoc.querySelector('main.content');
if (note !== null) {
// This should only happen for chapter cross references
// (since there is no id in the URL)
// remove the first header
if (note.children.length > 0 && note.children[0].tagName === "HEADER") {
note.children[0].remove();
}
const html = processXRef(null, note);
instance.setContent(html);
}
}).finally(() => {
instance.enable();
instance.show();
});
}
}, function(instance) {
});
}
let selectedAnnoteEl;
const selectorForAnnotation = ( cell, annotation) => {
let cellAttr = 'data-code-cell="' + cell + '"';
let lineAttr = 'data-code-annotation="' + annotation + '"';
const selector = 'span[' + cellAttr + '][' + lineAttr + ']';
return selector;
}
const selectCodeLines = (annoteEl) => {
const doc = window.document;
const targetCell = annoteEl.getAttribute("data-target-cell");
const targetAnnotation = annoteEl.getAttribute("data-target-annotation");
const annoteSpan = window.document.querySelector(selectorForAnnotation(targetCell, targetAnnotation));
const lines = annoteSpan.getAttribute("data-code-lines").split(",");
const lineIds = lines.map((line) => {
return targetCell + "-" + line;
})
let top = null;
let height = null;
let parent = null;
if (lineIds.length > 0) {
//compute the position of the single el (top and bottom and make a div)
const el = window.document.getElementById(lineIds[0]);
top = el.offsetTop;
height = el.offsetHeight;
parent = el.parentElement.parentElement;
if (lineIds.length > 1) {
const lastEl = window.document.getElementById(lineIds[lineIds.length - 1]);
const bottom = lastEl.offsetTop + lastEl.offsetHeight;
height = bottom - top;
}
if (top !== null && height !== null && parent !== null) {
// cook up a div (if necessary) and position it
let div = window.document.getElementById("code-annotation-line-highlight");
if (div === null) {
div = window.document.createElement("div");
div.setAttribute("id", "code-annotation-line-highlight");
div.style.position = 'absolute';
parent.appendChild(div);
}
div.style.top = top - 2 + "px";
div.style.height = height + 4 + "px";
div.style.left = 0;
let gutterDiv = window.document.getElementById("code-annotation-line-highlight-gutter");
if (gutterDiv === null) {
gutterDiv = window.document.createElement("div");
gutterDiv.setAttribute("id", "code-annotation-line-highlight-gutter");
gutterDiv.style.position = 'absolute';
const codeCell = window.document.getElementById(targetCell);
const gutter = codeCell.querySelector('.code-annotation-gutter');
gutter.appendChild(gutterDiv);
}
gutterDiv.style.top = top - 2 + "px";
gutterDiv.style.height = height + 4 + "px";
}
selectedAnnoteEl = annoteEl;
}
};
const unselectCodeLines = () => {
const elementsIds = ["code-annotation-line-highlight", "code-annotation-line-highlight-gutter"];
elementsIds.forEach((elId) => {
const div = window.document.getElementById(elId);
if (div) {
div.remove();
}
});
selectedAnnoteEl = undefined;
};
// Handle positioning of the toggle
window.addEventListener(
"resize",
throttle(() => {
elRect = undefined;
if (selectedAnnoteEl) {
selectCodeLines(selectedAnnoteEl);
}
}, 10)
);
function throttle(fn, ms) {
let throttle = false;
let timer;
return (...args) => {
if(!throttle) { // first call gets through
fn.apply(this, args);
throttle = true;
} else { // all the others get throttled
if(timer) clearTimeout(timer); // cancel #2
timer = setTimeout(() => {
fn.apply(this, args);
timer = throttle = false;
}, ms);
}
};
}
// Attach click handler to the DT
const annoteDls = window.document.querySelectorAll('dt[data-target-cell]');
for (const annoteDlNode of annoteDls) {
annoteDlNode.addEventListener('click', (event) => {
const clickedEl = event.target;
if (clickedEl !== selectedAnnoteEl) {
unselectCodeLines();
const activeEl = window.document.querySelector('dt[data-target-cell].code-annotation-active');
if (activeEl) {
activeEl.classList.remove('code-annotation-active');
}
selectCodeLines(clickedEl);
clickedEl.classList.add('code-annotation-active');
} else {
// Unselect the line
unselectCodeLines();
clickedEl.classList.remove('code-annotation-active');
}
});
}
const findCites = (el) => {
const parentEl = el.parentElement;
if (parentEl) {
const cites = parentEl.dataset.cites;
if (cites) {
return {
el,
cites: cites.split(' ')
};
} else {
return findCites(el.parentElement)
}
} else {
return undefined;
}
};
var bibliorefs = window.document.querySelectorAll('a[role="doc-biblioref"]');
for (var i=0; i<bibliorefs.length; i++) {
const ref = bibliorefs[i];
const citeInfo = findCites(ref);
if (citeInfo) {
tippyHover(citeInfo.el, function() {
var popup = window.document.createElement('div');
citeInfo.cites.forEach(function(cite) {
var citeDiv = window.document.createElement('div');
citeDiv.classList.add('hanging-indent');
citeDiv.classList.add('csl-entry');
var biblioDiv = window.document.getElementById('ref-' + cite);
if (biblioDiv) {
citeDiv.innerHTML = biblioDiv.innerHTML;
}
popup.appendChild(citeDiv);
});
return popup.innerHTML;
});
}
}
});
</script>
</div> <!-- /content -->
</body></html>