Average Overlay

The Average Overlay of the urbanization attribute.

The Average Overlay is a multi purpose Grid Overlay which displays (smoothed) values. These values can originate from spatial features, such as buildings, terrains, areas and neighborhoods. Alternatively, the values can originate from another Grid Overlay.

Spatial Features

A parameter assigned to a grid-cell can be related to one or more types of features in the project map: Buildings, Addresses, Terrains, Areas, Neighborhoods and Net Lines. The way this value is selected depends on the Averaged Input Type and calculation parameters.

Interpolate NODATA

The Average overlay can also be configured to replace NO_DATA values with interpolated non NO_DATA values using surrounding cells within a specified distance.

Additional information displayed in hover panel

The Average Overlay of the urbanization attribute and additional information in the hover panel.

When clicking on a specific location in the map of the Average Overlay, the hover panel gives additional information about the actual value in that specific grid cell.

Calculation

The Average Overlay works by first rasterizing input values. These values can be obtained from Vector data or a Grid Overlay.

Once rasterized, the configured result type determines the operation applied on these values.

Additional parameters define the operation range, the default value if none is rasterized, and the number of timeframes for attributes with multiple values.

Averaged Input Type

You can also configure in what way a value for this overlay will be rasterized.

Key

• First: Selects the first value encountered among all considered Vector data types. See Rasterized Vector data for the order.
• Min: Selects the minimum value among all considered Vector data types.
• Max: Selects the maximum value among all considered Vector data types.
• Single layer: Only Vector data of the configured Maplink (Average Overlay) is rasterized.

Icon	Key	Unit	Range	Description	Default value
	KEY	m	-3.4028235E38 to 3.4028235E38	Key used to retrieve a value from one or more Layers for a specific grid cell. Grid cell value will be averaged over the selected distance.	0

Grid

Use the values of another Grid Overlay when specified as input, instead of an Attribute. NO_DATA values of the referenced Overlay result in NO_DATA values in the grid. The Average Overlay inherits the number of timeframes from the Input Overlay. If their grid sizes differ, the input grid is automatically resized.

Name	Prequel	Underlying data	Unit	Range	No data	Description
INPUT	INPUT	Average Prequel		- infinity to infinity		The Grid Overlay that provides the Average Overlay with its initial values.

Average Result Type

The configured Average Overlay result type determines how a cell's value is calculated. The following result types are supported for the Average Overlay:

Icon	Result type	Unit	Mode	Description
	AVG			A cell's value is the average of itself and its surrounding cells.
	MIN			A cell's value is the minimum of itself and its surrounding cells.
	MAX			A cell's value is the maximum of itself and its surrounding cells.
	AVG_INTERPOLATED			Replace NO_DATA cells using their surrounding cells.

Rasterized Vector data

Rasterized vector data depends on the Maplink (Average Overlay) and Average Input Type. If the input type is 'Grid', no vector data is used. Otherwise, all MapLink layers are considered if MapLink is null; otherwise, only the specified MapLink is rasterized.

The Average Overlay currently supports the following MapLinks (in order): Net Lines, Addresses, Buildings, Terrains, Areas, Neighborhoods.

Icon	Property	Description	Default value
	Rasterization	The rasterization method of an Average Overlay	FIRST
	Maplink	The attribute maplink (layer) used to select an Key when rasterizing a Average Overlay	None (null)

Calculation

The way of averaging is defined by several Attributes, and can most easily be set using the Average Overlay Wizard.

The calculation can be configured via the following attributes:

Icon	Attribute	Unit	Range	Description	Default value
	ATTRIBUTE_TIMEFRAMES	integer	1 to 1000	The amount of timeframes to display when basing input on Attribute arrays.	1
	DEFAULT_VALUE			The default value used for a cell when no spatial data overlaps that cell.	0
	DISTANCE_M	m	0 to 2000.0	The radius within which an average value must be computed.	100
	SURFACE_ONLY	boolean	0 to 1	Whether the configured attribute should only be sampled from the Surface layer.	1

Notes

Input overlay step in the Water Overlay wizard.

• Input Overlays are overlays that can provide insight in the data used for complex Overlay models (e.g the Water Overlay). These input Overlays can be added automatically as Average Overlays to your project by selecting them in the Input Overlay step of a Wizard.

How-to's

• How to add and remove an Overlay
• How to edit an overlay legend

Average Overlay Variants:

• How to create an Average Overlay based on another Grid Overlay.
• How to fill NO_DATA values in a grid overlay by interpolation using an Average Overlay.
• How to create an Average Overlay based on feature attributes.
• How to configure an Average Overlay to gain insight into grid cell values.
• How to smooth Grid Overlay results
• How to remove a waterway from the heightmap
• How to create an Overlay showing the presence of structures
• How to create an Overlay which highlights unused land

See also

• Model attributes (Average Overlay)
• Attribute model (Average Overlay)
• Grid model (Average Overlay)

API Endpoints

• Api session event editor overlay set rasterization
• Api session event editor overlay set result type
• Api session event editor overlay set attribute
• Api session event editor overlay set avg distance
• Api session event editor overlay set prequel

External links

• Extended Combo and average overlay functionalities.

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Average Overlay

Group

Model Attributes

Attributes

Attribute timeframes • Default value • Distance m • Surface only

Keys

Key

Models

Attribute • Grid

Prequels

Input

Properties

Maplink • Rasterization

Result types

Avg • Min • Max • Avg interpolated

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Overlays

Categorization

Grid • Overlay Type • Parent • Result Child • Result Parent • Result type • Key

Default

City

Administrative

Ownership • Ownership Grid • Zipcodes • Zoning • Neighborhoods • Municipalities • Scenario

Environmental

Heat Stress • Shadow • Traffic Density • Traffic Noise • Traffic NO2 • Livability

Water

Rainfall • Flooding • Groundwater • Watershed

Grid Calculation

Average • Combo • Distance • Sight Distance • Travel Distance • Inference • Iteration

Geo Data

GeoTIFF • WCS • WMS • Image • Area • Attribute • Function

Topography

Satellite • Digital Surface Model • Digital Terrain Model • Building Floors • Underground • Source

Network

Network Distance • Network Overview • Network Ownership