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OpenLayers 3 : Beginner's Guide by Erik Hazzard, Paul Spencer, Thomas Gratier

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Types of raster sources

So far, we focused on the differences between tiled and untiled, but you also have some differences coming from the source property.

Defining a source

So, how can we define a source? What is its purpose?

Sources in OpenLayers 3 language define how and where you can access the layer. You always need a source from an ol.source subclass in order to retrieve and display layers.

Why did OpenLayers 3 development team invent this concept?

It was mainly for the organization of the code and reusability of the same principles. You gain modularity because you have only three types of layers but more sources. It enables you to decouple the type of layer you are using from the data source and the way you call it. It's simpler to manage a ...

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