Filters

Since widgets provide a visual representation of the data, they also commonly offer a rich interface for filtering: for example, clicking in a specific bar within a bar chart could filter the entire application, or at least, filter data within a map. We'll refer to this type of non-geospatial filtering as column filters.

But also, interacting with the map (such as zooming in a specific location, or drawing a circle) could trigger filters that are based on geospatial information, most commonly a specific area. We'll refer to this type of geospatial (polygon) based filtering as spatial filters.

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