In general this is a hard problem. Using the models base as basic building blocks one can construct systems to study specific issues in detail. This is illustrated in Figure 2 where the multi-level models are represented . The functionality deals with three issues basically input, output, and process. Broadly input consists of data import and model management utilities.
Utility exists to transfer data into and out of the database.
Features such as rivers could be overlaid on the graphs. Standard geography views are included. For example ariel photographs and satellite photos can be overlaid. Interpolation routine to shape key inputs such as rate of economic growth, etc. using multiple interpolation methods are available. The philosophical concepts in this paper has been taken in a large part from the Mesarovic, McGinnis and West, 1996.