Overlay

An overlay is a layer visualized on top of the 3D world to highlight specific properties. Overlays provide quick insight in the spatial layout of a specific subject, such as the variation of height and ownership. The visualized properties can originate from the current state of the project or from a result of a spatial calculation.

However, most overlays that can be added to a project use an underlying computation model, which rasterize the spatial data in the project and apply calculations to it to produce various results. These computational overlays can range from simple distance and average operations to complex water simulations.

How do overlays relate to the Tygron Platform interface

Overlays are implemented in the Tygron Platform as part of the interface. Properties such as ownership and zoning are important pieces of information to the user, but would be very overwhelming to display at all times. Instead, a user can activate on overlay to make these pieces of information visible. In principle, all spatially varied information is accessible as an overlay.

How to access overlays in a project

File:Overlays-Icons.jpg

How to show an overlay in the viewer app.

Overlays available to stakeholders appear as buttons on the right side of the interface. Clicking on any of these buttons will switch the view to the specific overlay. Clicking on the "City" overlay will switch the view back to default. Some overlays are automatically added when a project is created. Some overlays are closely related to indicators, such as Heatstress and Livability.

Parent Overlay

Overlays can be grouped together as multiple Child Overlays under a single Parent Overlay. This allows for a large amount of Overlays to be organized into an easier-to-use hierarchy. Hovering over any of the Overlays in the Overlay menu will show additional icons for the Child Overlays of that Overlay, if any exist.

Every Overlay is considered a Parent Overlay, unless it has a Parent Overlay set, in which case it becomes a Child Overlay of that Parent Overlay. Overlays with Child Overlays cannot be a Child Overlay to another Overlay. Result child type Overlays are always Child Overlays of other Overlays.

When a parent overlay is removed, it's child overlays are not removed, unless the child overlay is a result child type overlay. Otherwise, they simply have no parent overlay set anymore and become a parent overlay themselves.

List of available Overlays

Icon	Name	Category	Type	Displays
	City	Default	None	The default view without any overlay
	Ownership	Default	Feature	Ownership of constructions/ plots
	Ownership Grid	Administrative	Grid	Ownership of constructions/ plots
	Municipalities	Administrative	Feature	Municipalities in the project area
	Neighborhoods	Default	Feature	Neighborhoods in the project area
	Vacancy	Administrative	Feature	Constructions marked as vacant are highlighted
	Zipcodes	Administrative	Feature	Postal codes
	Zoning	Administrative	Feature	Zoning (related to zoning plans)
	Aerius	Environmental	Grid	Impact of traffic on NOX and NH3 polution on Natura 2000 areas in the Netherlands
	Heat	Environmental	Grid	Urban heat stress
	Livability	Environmental	Grid	Livability score
	Traffic Density	Environmental	Grid	Traffic density
	Traffic Noise	Environmental	Grid	Impact of traffic noise polution on surrounding area
	Traffic NO2	Environmental	Grid	Impact of traffic NO2 polution on surrounding area
	Flooding	Water	Grid	Impact of flooding on inundation
	Groundwater	Water	Grid	Underground water tables
	Rainfall	Water	Grid	Impact of rainfall on inundation
	Subsidence	Water	Grid	Areas subject to subsidence
	Watershed	Water	Grid	Discharge areas based on DTM or Water overlay's flow direction.
	Waterwijzer	Water	Grid	Crop yield loss based on ground water levels and type of soil.
	Average	Distance	Grid	Smoothened values of grid cells
File:Overlay icon distance sight.png	Distance Sight	Distance	Grid	Combined distance zone with line of sight
	Distance Zone	Distance	Grid	Defined contour around an object
	Disturbance Distance	Distance	Grid	Contour based on sound disturbance
	Safety Distance	Distance	Grid	Contour based on safety distance
	Travel Distance	Distance	Grid	Contour based on travel distance
File:Overlay icon areas.png	Areas	Custom	Feature	Selection of Areas
	Attribute	Custom	Feature	Presence of a specific attribute in a data layer
	Combo	Custom	Grid	Combines up to three grid overlays using mathematical functions and boolean operators.
	Custom Color Area	Custom	Feature	One or more areas for which a separate color and name can be set
	Geotiff	Custom	Grid	External data in Geotiff format
	Image	Custom	Grid	A custom image
	Source	Custom	Feature	Datasets/sources currently in use for generating the project
File:Overlay icon function highlight.png	Function Highlight	Landscape	Feature	Highlights specified functions/ constructions
	Digital Surface Model	Landscape	Grid	Height of the terrain and building heights (DSM)
	Digital Terrain Model	Landscape	Grid	Height of the terrain (DTM)
	Underground	Landscape	Feature	Underground composition
	Network Overview	Networks	Feature	Lines, loads and cluster topography of a network
	Network Ownership	Networks	Feature	Ownership of lines, loads and clusters of a network

Notes

• The following overlays are available by default when creating a new project: City, Neighborhoods, Ownership and Zoning
• Grid overlays have the ability to show the difference between the maquette and the original state. The difference visualization uses its own legend. The option to show the difference can be turned on or off per Grid Overlay.
• Overlays can be given Attributes. Some of these Attributes are used by their calculation model.
• Some overlays can have visulizations of different results of one calculation, which are the result types. For example, for the Water Overlay the result types include the surface last value result type and the groundwater result type for water above and below ground respectively.
• Some overlays store multiple timeframes of results. Examples are the Water Overlay and the Heat Overlay. Each timeframe is a complete snapshot of results of the entire project area. These results can be viewed in sequence. When these overlays are visualized in the 2D map, the last timeframe is shown.

How-to's

• How to add and remove an Overlay

See Also

• 

  Overlays
  

  Overlay results

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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 • Aerius

Water

Rainfall • Flooding • Groundwater • Subsidence • Watershed • Waterwijzer

Raster Calculation

Average • Combo • Distance • Sight Distance • Travel Distance

Geo Data

Area • Attribute • GeoTIFF • WCS • WMS • Image

Topography

Digital Surface Model • Digital Terrain Model • Underground • Function • Source

Network

Network Distance • Network Overview • Network Ownership

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Current Situation

Current Situation

Buildings • Terrains • Administrative • Areas • Networks • Overlays • Indicators • Panels • Globals •  Queries • Geo Import

Buildings

Function • Function Override • Traffic Units

Terrain

Height sector • Elevation model • Elevation GeoTIFF • Elevation Grid Overlay • Ground Price • Terrain Type • Terrain Type Override

Administrative

Neighborhood • Zone • Permission Popup • Plot • Zip Code

Geo Import

Source • GeoShare

Network

Net Cluster • Net Function • Net Line • Net Load • Net Node • Net Setting

Editor

Current Situation • Future Design • Multi Scenario • Tools • Community