Create Urban Database

WallMan provides two kinds of shapes for the creation of buildings. The rectangular and the polygonal shape.

Table 1. Shapes for the creation of buildings.

	Polygonal shape Each click with the left mouse button creates an edge of the polygon. A click with the right mouse button closes the polygon by connecting the last edge with the first.
	Rectangular shape First click with the left mouse button starts the rectangle, a second click finishes it.

With these tools four kinds of objects can be created:

Table 2. Objects created from the shapes for the creation of buildings.

	Standard building (no special type selected)
	Virtual building Excludes areas from the computation. Useful if large areas which don’t have to be computed lie inside a city (for example, lakes)
	Vegetation object Adds an additional attenuation to rays that go through it. Pixels inside these objects will be computed (opposed to that in virtual buildings)
	Courtyard / Tower Buildings that lie inside other buildings have to be defined as courtyard (lower than surrounding building) or tower (higher than surrounding building)

New objects automatically have the height the 3rd coordinate is currently set to.