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 an other Grid Overlay.

A parameter assigned to a grid-cell can be related to one or more types of features in the project area: Buildings, Addresses, Terrains, Areas, Neighborhoods and Net Lines.

Thirdly the Average overlay supports replacing 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 over 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 determine for example the range of the operation, the default value in case none was rasterized and the amount of timeframes that should be created when rasterizing an attribute with potentially more than one value.

Averaged Input Type

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

• 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.
• 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 will have timeframes equal to the amount of timeframes of the Input Overlay. In case the input Grid Overlay does not have the same grid size as the Average Overlay, the input Grid Overlay 's value 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 cells 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 NODATA cells using its surrounding cells.

Rasterized Vector data

The Vector data that is rasterized is determined by two values: the configured layer MapLink (Average Overlay) of the Average overlay and the configured Average Type. If the Average Type is set to Grid, no vector data is rasterized for this overlay. When the MapLink is set to null, and the Average Type is set to anything other than Grid, all MapLink layers are considered. When the MapLink layer is set to a specific MapLink, only that type of data 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 a Average Overlay	FIRST
	Maplink	The attribute maplink (layer) used to select an Attribute 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		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

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 and 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

See also

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

External links

• Extended Combo and average overlay functionalities.

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Average Overlay

Group

Model Attributes

Attributes

Attribute timeframes • Default value • Distance m

Keys

Attribute

Models

Attribute • Grid

Prequels

Input

Properties

Maplink • Rasterization

Result types

Avg • Min • Max • Avg interpolated

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Overlays

Categorization

Grid • Parent • Result Child • Result Parent • Result type

Default

City

Administrative

Ownership • Ownership Grid • Zipcodes • Zoning • Neighborhoods • Municipalities • Vacancy

Environmental

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

Water

Rainfall • Flooding • Groundwater • Subsidence • 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 • Underground • Source

Network

Network Distance • Network Overview • Network Ownership