Prequel
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A Prequel is an Grid Overlay which serves as input for another (geographical) calculation model, in place of Keyed Attribute values.
In most cases, a Grid Overlay calculation will reference the presence of Attribute values which are related to vector data, such as Constructions or Areas. This is then rasterized to provide input for the calculation model. For a number of calculation models, it is possible to configure a Prequel instead. This is a Grid Overlay, the output of which serves as that same kind of input.