View source for How to create an Overlay which highlights unused land

The [[3D Visualization]] shows a combination of spatial features, such as [[Building]]s and [[Terrain Type]]s, against a backdrop of a satellite image. While this provides a complete view of the structure of the world, it can also convolute getting a clear view of the data. In addition, the presence or absence of data can sometimes be very relevant for use-cases pertaining to land utilization. For both these cases, a [[Grid Overlay]] indicating land which is or is not in use by [[Building]]s is of added value.

{{editor location|overlays|dropdown=Add Average Overlay}}

{{howto
| Add an [[Average Overlay]]
| Ensure the input layer is set to [[Building]]s
| Set the averaging distance to "0"
| Set the averaging attribute to [[Default floors (Function Value)|DEFAULT_FLOORS]]
| Set the legend as follows:
| {{howtoblock
    | Text: Empty
    | Value: 0
    | Color: Green
  }}
| {{howtoblock
    | Text: Built
    | Value: 0,1
    | Color: Red
  }}
| The result is a calculated [[Grid Overlay]] which has a value of 0 in places where no [[Building]] exist, and a value greater than 0 in places where a [[Building]] does exist.
}}

{{article end
|notes=

* The [[Default floors (Function Value)|DEFAULT_FLOORS]] Attribute exists for all [[Building]]s with a minimal value of 1, (including ones which would not commonly be associated with floors, such as trees, parking lots, and pastures ).
|seealso=
* [[Building]]
* [[Average Overlay]]
* [[Combo Overlay]]
}}