Prequels (Shadow Overlay)

Prequel overlays can be linked to the Shadow Overlay to initiate particular parts of the model with more accuracy and detail.

Name	Prequel	Underlying data	Unit	Range	No data	Description
Building elevation	BUILDING_ELEVATION	Shadow Prequel	m (datum)	-10000 to 10000	Clamped to range	Used for initializing the digital surface model used for this Shadow Overlay.
Foliage height	FOLIAGE_HEIGHT	Shadow Prequel	m	0 to 100	Clamped to range	Used for initializing the relative foliage heights.
Terrain elevation	TERRAIN_ELEVATION	Shadow Prequel	m (datum)	-10000 to 10000	Clamped to range	Used for initializing the digital terrain model used for this Shadow Overlay.

---

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