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<div class="section" id="leaflet-choropleth-app">
<h1><a class="toc-backref" href="#id1">Leaflet Choropleth App</a><a class="headerlink" href="#leaflet-choropleth-app" title="Permalink to this headline">¶</a></h1>
<div class="contents topic" id="table-of-contents">
<p class="topic-title">Table of Contents</p>
<ul class="simple">
<li><a class="reference internal" href="#leaflet-choropleth-app" id="id1">Leaflet Choropleth App</a><ul>
<li><a class="reference internal" href="#intro" id="id2">Intro</a></li>
<li><a class="reference internal" href="#choropleth-maps" id="id3">Choropleth Maps</a></li>
<li><a class="reference internal" href="#featuresrv-url" id="id4">featuresrv URL</a></li>
<li><a class="reference internal" href="#querying-features" id="id5">Querying Features</a></li>
<li><a class="reference internal" href="#relative-values" id="id6">Relative Values</a></li>
<li><a class="reference internal" href="#print" id="id7">Print</a></li>
<li><a class="reference internal" href="#using-geoserver" id="id8">Using GeoServer</a></li>
<li><a class="reference internal" href="#documentation" id="id9">Documentation</a></li>
</ul>
</li>
</ul>
</div>
<div class="section" id="intro">
<h2><a class="toc-backref" href="#id2">Intro</a><a class="headerlink" href="#intro" title="Permalink to this headline">¶</a></h2>
<p>GeoSuite includes a Leaflet Choropleth map using your pg_featurserv installation</p>
<p>The map can be access via:</p>
<blockquote>
<div><a class="reference external" href="http://domain.com/LeafletChoropleth.html">http://domain.com/LeafletChoropleth.html</a></div></blockquote>
<p>It should appear as below:</p>
<img alt="../_images/ChoroplethApp.png" src="../_images/ChoroplethApp.png" />
<img alt="../_images/spacer.png" src="../_images/spacer.png" />
<p>This map uses Leafletjs and the Leaflet Choropleth Plugin:</p>
<blockquote>
<div><a class="reference external" href="https://github.com/timwis/leaflet-choropleth">https://github.com/timwis/leaflet-choropleth</a></div></blockquote>
</div>
<div class="section" id="choropleth-maps">
<h2><a class="toc-backref" href="#id3">Choropleth Maps</a><a class="headerlink" href="#choropleth-maps" title="Permalink to this headline">¶</a></h2>
<p>A Choropleth map renders coloring based on user defined ranges.</p>
<p>In the demo map, GDP is used to determine country coloring.</p>
<p>At top right, a legend is displayed that shows the color range</p>
<img alt="../_images/gdp-1.png" src="../_images/gdp-1.png" />
<img alt="../_images/spacer.png" src="../_images/spacer.png" />
<p>This metric we are using (gdp_md), along with the color and steps between is passed via the choroplethLayer as below:</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">// Add GeoJSON</span>
<span class="gp"> $</span>.getJSON<span class="o">(</span>full_url,<span class="w"> </span><span class="k">function</span><span class="w"> </span><span class="o">(</span>geojson<span class="o">)</span><span class="w"> </span><span class="o">{</span>
<span class="go"> var choroplethLayer = L.choropleth(geojson, {</span>
<span class="go"> valueProperty: 'gdp_md',</span>
<span class="go"> scale: ['#fbfad4', 'green'],</span>
<span class="go"> steps: 5,</span>
<span class="go"> mode: 'q',</span>
<span class="go"> style: {</span>
<span class="go"> color: '#fff',</span>
<span class="go"> weight: 2,</span>
<span class="go"> fillOpacity: 0.8</span>
</pre></div>
</div>
<p>The js for our Legend is below and updating the choropleth metric requires only updating the display name:</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">// Add legend</span>
<span class="go"> var legend = L.control({ position: 'topright' })</span>
<span class="go"> legend.onAdd = function (map) {</span>
<span class="go"> var div = L.DomUtil.create('div', 'info legend')</span>
<span class="go"> var limits = choroplethLayer.options.limits</span>
<span class="go"> var colors = choroplethLayer.options.colors</span>
<span class="go"> var labels = []</span>
<span class="go"> // Add min & max</span>
<span class="go"> div.innerHTML = `</span>
<span class="go"> <div class="labels"></span>
<span class="go"> <div class="quarter1">` + limits[0] + `</div></span>
<span class="go"> <div class="quarter2">` + Math.round(((limits[limits.length - 1]-limits[0])*.25)+limits[0]) + `</div></span>
<span class="go"> <div class="quarter3">` + Math.round(((limits[limits.length - 1]-limits[0])*.75)+limits[0]) + `</div></span>
<span class="go"> <div class="quarter4">` + limits[limits.length - 1] + `</div></span>
<span class="go"> </div>`</span>
<span class="go"> limits.forEach(function (limit, index) {</span>
<span class="go"> labels.push('<li style="background-color: ' + colors[index] + '"></li>')</span>
<span class="go"> })</span>
<span class="go"> div.innerHTML += '<ul>' + labels.join('') + '</ul> <span>'+humanize('Median GDP')+'</span>'</span>
<span class="go"> return div</span>
<span class="go"> }</span>
<span class="go"> legend.addTo(map);</span>
<span class="go"> });</span>
</pre></div>
</div>
</div>
<div class="section" id="featuresrv-url">
<h2><a class="toc-backref" href="#id4">featuresrv URL</a><a class="headerlink" href="#featuresrv-url" title="Permalink to this headline">¶</a></h2>
<p>If you need to change the url for any reason, go to /var/www/html/LeafletChoroDemo.html and edit line 155:</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">var full_url = "https://<YourIP>:9001/collections/public.countries/items.json?limit=100&continent=Europe";</span>
</pre></div>
</div>
<p>Change <YourIP> to your server IP or hostname.</p>
<p>Note: If you are not using SSL, update the line to use ‘HTTP’ and port to 9000</p>
</div>
<div class="section" id="querying-features">
<h2><a class="toc-backref" href="#id5">Querying Features</a><a class="headerlink" href="#querying-features" title="Permalink to this headline">¶</a></h2>
<p>In our demo app, we are only limiting the number of items retured (100) and the continent (Europe):</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">var full_url = "http://carmen.webgis1.com:9000/collections/public.countries/items.json?limit=100&continent=Europe";</span>
</pre></div>
</div>
<p>As you can see, this results in a large number of Properies being displayed on click.</p>
<p>We can change this using the pg_featurserv query parameters.</p>
<p>Let’s add below to limit the Properties displayed to country name, estimated population, and gdp:</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">&properties=name,pop_est,gdp_md</span>
</pre></div>
</div>
<p>Our url now becomes:</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">var full_url = "http://carmen.webgis1.com:9000/collections/public.countries/items.json?limit=100&continent=Europe&properties=name,pop_est,gdp_md";</span>
</pre></div>
</div>
<p>Clicking on the map, the properties now becomes more manageable:</p>
<img alt="../_images/query-2.png" src="../_images/query-2.png" />
<img alt="../_images/spacer.png" src="../_images/spacer.png" />
</div>
<div class="section" id="relative-values">
<h2><a class="toc-backref" href="#id6">Relative Values</a><a class="headerlink" href="#relative-values" title="Permalink to this headline">¶</a></h2>
<p>It’s important to note that while properties are the value from the database the Choropleth function shows values relative to our query.</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">var full_url = "http://carmen.webgis1.com:9000/collections/public.countries/items.json?limit=100&continent=Europe&properties=name,pop_est,gdp_md";</span>
</pre></div>
</div>
<p>If we look at the shading for Belarus, for example, it’s GDP is rendered relative to the items (Europe, in our case)</p>
<img alt="../_images/belarus.png" src="../_images/belarus.png" />
<img alt="../_images/spacer.png" src="../_images/spacer.png" />
<p>Let’s now change our Query to remove ‘&continent=Europe’ and increase the limit to 500 to include all countries</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">var full_url = "http://carmen.webgis1.com:9000/collections/public.countries/items.json?limit=500&properties=name,pop_est,gdp_md";</span>
</pre></div>
</div>
<p>As we can see, the GDP for Belarus relative to the world (and not just Europe) shows a deeper shade of green,as do the other countries of Europe as we are now seeing GDP relative to all countries and not just Europe.</p>
<img alt="../_images/belarus-3.png" src="../_images/belarus-3.png" />
<img alt="../_images/spacer.png" src="../_images/spacer.png" />
</div>
<div class="section" id="print">
<h2><a class="toc-backref" href="#id7">Print</a><a class="headerlink" href="#print" title="Permalink to this headline">¶</a></h2>
<p>Printing for the demo app is enabled by the leaflet.browser.print plugin:</p>
<blockquote>
<div><a class="reference external" href="https://github.com/Igor-Vladyka/leaflet.browser.print">https://github.com/Igor-Vladyka/leaflet.browser.print</a></div></blockquote>
<p>The print plugin offers Portrait, Landscape, Auto, and Custom options</p>
<p><strong>1. Click the print icona and select Auto</strong></p>
<img alt="../_images/print.png" src="../_images/print.png" />
<img alt="../_images/spacer.png" src="../_images/spacer.png" />
<p><strong>2. On click a new window will open atop the current window as below. Select “Save as PDF” from the dropdown.</strong></p>
<img alt="../_images/print-page.png" src="../_images/print-page.png" />
<img alt="../_images/spacer.png" src="../_images/spacer.png" />
<p><strong>3. Depending on your device, you may have additional print/save options as well</strong></p>
<img alt="../_images/print-options.png" src="../_images/print-options.png" />
<img alt="../_images/spacer.png" src="../_images/spacer.png" />
</div>
<div class="section" id="using-geoserver">
<h2><a class="toc-backref" href="#id8">Using GeoServer</a><a class="headerlink" href="#using-geoserver" title="Permalink to this headline">¶</a></h2>
<p>As you may have noticed, our map requires only a json feed.</p>
<p>In the demo, we are using pg_featurserv, but we can change this to GeoServer with 3 simple changes:</p>
<p><strong>1. In your GeoServer instance, go to Layer Preview and select GeoJson under WFS for the USA Popular layer</strong></p>
<img alt="../_images/json-1.png" src="../_images/json-1.png" />
<img alt="../_images/spacer.png" src="../_images/spacer.png" />
<p><strong>2. Substiture the full url for pg_featurserv url</strong></p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">var full_url = "http://domain.com/geoserver/topp/ows?service=WFS&version=1.0.0&request=GetFeature&typeName=topp:states&maxFeatures=50&outputFormat=application/json";</span>
</pre></div>
</div>
<p><strong>3. Update line 159 to FAMILIES</strong></p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">valueProperty: 'FAMILIES',</span>
</pre></div>
</div>
<p><strong>4. Update line 208 to FAMILIES</strong></p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">div.innerHTML += '<ul>' + labels.join('') + '</ul> <span>'+humanize('FAMILIES')+'</span>'</span>
</pre></div>
</div>
<p><strong>5. Refreshing the page should now show our USA Population layer with FAMILIES as you metric:</strong></p>
<img alt="../_images/geoserver-1.png" src="../_images/geoserver-1.png" />
<img alt="../_images/spacer.png" src="../_images/spacer.png" />
</div>
<div class="section" id="documentation">
<h2><a class="toc-backref" href="#id9">Documentation</a><a class="headerlink" href="#documentation" title="Permalink to this headline">¶</a></h2>
<p><a class="reference external" href="https://access.crunchydata.com/documentation/pg_featureserv/latest/">https://access.crunchydata.com/documentation/pg_featureserv/latest/</a></p>
<p><a class="reference external" href="https://github.com/timwis/leaflet-choropleth">https://github.com/timwis/leaflet-choropleth</a></p>
<p><a class="reference external" href="https://github.com/CrunchyData/pg_featureserv">https://github.com/CrunchyData/pg_featureserv</a></p>
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