Shadow Overlay

This article is a stub. The following information should be added:

• expand on calculation, without solely relying on heat calculation
• speed over heat is not the primary feature and should be moved to note or less prominent location on article
• image of result

The Shadow Overlay stores the result of a Shade calculation caused by the sun. The sun's altitude and azimuth are stored as model attribute in the Shadow Overlay.

The sun's altitude and azimuth can be automatically configured using the Shadow Overlay Wizard. It allows users to specify dates; one or more days, each with one or more hours of that day. These dates, in combination with the project's world location are used to obtain the altitude and azimuth of the sun. Each individual date corresponds to a separate timeframe of the Shadow Overlay.

The shadow calculation takes into account both the Terrain Elevation and the Building Elevation. Additionally, the Foliage Height can be specified, or calculated automatically using a Foliage crown factor.

Notes

• Shadow overlay is identical to the Shade result type of an Heat Overlay. However, using this specific Overlay is approximately 10 times faster then calculating the Shade with the overhead of the complete DPRA Heat Module.

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Shadow Overlay

Model attributes

Dates • Max foliage radius • Max shadow distance • Sun altitude • Sun azimuth

Shadow features

Foliage Area • Foliage crown factor • Foliage height

Prequels

Building elevation • Foliage height • Terrain elevation

Calculation models

Foliage height • Shade

Result types

Shade • Foliage

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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 • Shadow • 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