Example 
The GIS will be used to operate the source-based 
assessment model. For example, to analyze the impacts 
of coal mining on prime farmland: 
¢ the source is mining 
¢ the agent is the physical dispersal of soil 
¢ the receptor is the land 
The GIS coverages (topologically linked geographic 
features and their descriptive data) would be: 
¢ the mine locations 
4 soil identification and distribution 
¢ land cover 
The final products would pees imeiagoreand an 
analysis conducted by the user to support the agency’ s 
decision-making process. 
