Release Level	5.4
	Release Date	2008 10
	Revision Level	1.0

Population Data

associated with polygons similar to area sources. These data (usually from a census with associated census tracks as the spatial units) form the basis for the poluation data raster used for the calculation of population exposure.

The primary entry from the object class selection leads to a ranking list of population objects, i.e., populated areas or census tracts.

The listing shows the object names, an associated symbolics address (e.g., district) and the absolute and total population numbers.

The associated map can be zoomed, and queried: to start the info mode, click the info button under the map, the click on any one of the color coded areas on the map. The name of the object will be shown. To return to the zooming mode, click the zoom button.