27 lines
1.3 KiB
HTML
27 lines
1.3 KiB
HTML
---
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layout: example.html
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title: Filtering features with WebGL
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shortdesc: Using WebGL to filter large quantities of features
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docs: >
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This example shows how to use `ol/layer/WebGLPoints` with a literal style to dynamically filter a large amount
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of point geometries. The above map is based on a dataset from the NASA containing 45k recorded meteorite
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landing sites. Each meteorite is marked by a circle on the map (the bigger the circle, the heavier
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the object). A pulse effect has been added, which is slightly offset by the year of the impact.
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Adjusting the sliders causes the objects outside of the date range to be filtered out of the map. This is done
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by mutating the variables in the `style` object provided to the WebGL layer. Also note that the last snippet
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of code is necessary to make sure the map refreshes itself every frame.
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tags: "webgl, icon, sprite, filter, feature"
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experimental: true
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---
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<div id="map" class="map"></div>
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<form>
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<div id="status">Show impacts between <span class="min-year"></span> and <span class="max-year"></span></div>
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<label for="min-year">Minimum year:</label>
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<input id="min-year" type="range" min="1850" max="2015" step="1" value="1850"/>
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<label for="max-year">Maximum year:</label>
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<input id="max-year" type="range" min="1850" max="2015" step="1" value="2015"/>
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</form>
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