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[[File:Average_overlay_example.JPG|thumb|250px|left|The Average Overlay of the urbanization attribute.]]
The Average Overlay is a multi purpose [[Grid overlay|Grid Overlay]] which displays (smoothed) values. These values can originate from spatial features, such as [[building]]s, [[terrain]]s, [[area]]s and [[neighborhood]]s. Alternatively, the values can originate from an other [[Grid Overlay]].


==Purpose of the Average Overlay==
A parameter assigned to a grid-cell can be related to one or more types of features in the [[project area]]: [[Building]]s, [[Address]]es, [[Terrain]]s, [[Area]]s, [[Neighborhood]]s and [[Net Line]]s.
A typical use-case of the Average Overlay is to display model data used in visualize parameters part of a simulation model (e.g. the rainfall overlay). A parameter assigned to a grid-cell can be related to one or more polygon layers. Such layers can be buildings, terrain, areas or neighborhoods.  


==Generating an Average Overlay:==
Thirdly the Average overlay supports replacing {{nodata}} values with interpolated non {{nodata}} values using surrounding cells within a specified distance.
Steps to generate an Average Overlay:
{{clear}}
* Go to the overlays tab, and select Add Avg
* ''Step 1: Choose a selection type:'' If you wish to create a spatial smooting, press Create an average Grid Overlay, if you wish to Gain insight into Grid Cell Values, press the latter option
* ''Step 2: Select an attribute value you wish to visualize:'' By pressing select you can select from a long list of attributes
* ''Step 3: Select, Select Layer:'' Attributes can be assigned to one of more polygon data layers: buildings, Terrains, Areas and Neighborhoods. In this step you can select the following options for assigning parameter values:
# Filter occurrence in Layers: an attribute value is selected from order of occurrence in the polygon data layer value mentioned above
# Minimum values in Layers. The minimum value is selected from all layers above
# Maximum values in Layers. The maximum value is selected from all layers above
# Specific Layer only. A specific layer can be selected.
* ''Step 4:'' Only when selected Create Grid Overlay in Step 1: a smoothing distance value


Press finish to generate the average overlay
==Additional information displayed in hover panel==
[[File:Average_hover_panel.JPG|thumb|250px|left|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.
{{clear}}
 
==Calculation==
The Average Overlay works by first rasterizing input values. These values can be obtained from Vector data or a [[Grid Overlay]].
 
Once [[#Rasterized Vector data|rasterized]], the configured result type determines the operation applied on these values.
 
Additional parameters determine for example the [[Distance m (Average Overlay)|range of the operation]], the [[Default value (Average Overlay)|default value]] in case none was rasterized and the [[Attribute timeframes (Average Overlay)|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 [[Rasterization (Average Overlay)|rasterized]]:
* '''First''': Selects the first value encountered among all considered Vector data types. See [[Average Overlay#Rasterized Vector data|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]]. {{nodata}} values of the referenced Overlay result in {{nodata}} values in the grid. The Average Overlay will have [[timeframe]]s equal to the amount of [[timeframe]]s 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.
{{Overlay prequels|suppresscategory=true|
{{:Input prequel (Average Overlay)}}
}}
 
===Average Result Type===
The configured [[Result type (Average Overlay)|Average Overlay result type]] determines how a cells value is calculated. The following result types are supported for the Average Overlay:
 
{{result types|suppresscategory=true|allowselflinks=true|
{{:Avg result type (Average Overlay)}}
{{:Min result type (Average Overlay)}}
{{:Max result type (Average Overlay)}}
{{:Avg interpolated result type (Average Overlay)}}
}}
 
===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 Overlay#Average Type|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 Line]]s, [[Address]]es, [[Building]]s, [[Terrain]]s, [[Area]]s, [[Neighborhood]]s.
 
{{Overlay property|suppresscategory=true|
{{:Rasterization (Average Overlay)}}
{{:Maplink (Average Overlay)}}
}}
 
===Calculation===
The way of averaging is defined by several [[Attribute]]s, and can most easily be set using the ''Average Overlay Wizard''.
 
The calculation can be configured via the following attributes:
{{overlay attributes|suppresscategory=true|allowselflinks=true|
  {{:Attribute timeframes (Average Overlay)}}
  {{:Default value (Average Overlay)}}
  {{:Distance m (Average Overlay)}}
}}
 
{{article end
|notes=
[[File:wateroverlay_wizard_input_overlay_step.jpg|thumb|right|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 Overlay]]s to your project by selecting them in the ''Input Overlay'' step of a Wizard.
|seealso=
*[[Model attributes (Average Overlay)]]
*[[Attribute model (Average Overlay)]]
*[[Grid model (Average Overlay)]]
|howtos=
* [[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]]
|external=
* [https://www.tygron.com/en/idea/extended-combo-and-average-overlay-functionalities  Extended Combo and average overlay functionalities.]
}}
{{AverageOverlay nav}}
{{Overlay nav}}

Latest revision as of 13:46, 15 March 2024

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

Average Overlay Variants:

See also

External links

Average Overlay
Group
Attributes
Attribute timeframes • Default value • Distance m
Keys
Attribute
Models
Attribute • Grid
Prequels
Input
Properties
Maplink • Rasterization
Result types
Avg • Min • Max • Avg interpolated


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


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