The implementation of composite computer mapping 1972

Composite computer mapping (CCM) is the name assigned to a recently developed technique to enhance the quality of decision making in the administration of aid to economic development. The name accurately implies a combination of two techniques (composite mapping and computer mapping) which have been used with varying effectiveness in other mapping programs. The combination of the two does far more than add to the usefulness of them - it combines the two visual display capabilities into an unprecedented analytical tool. For many years, computers have been taught to produce various kinds of maps. The primary advantage inherent in computer mapping is the tremendous capacity for data storage and its quick retrieval. For example, the computer can be programmed to print out symbols representing various classes of data over the census tracts of a city. Such things as assessment valuation are stored and processed by the computer. A map showing relative rankings of residential valuations by census tracts serves to locate those areas of a city with the highest residential capital investment. Comparison of this map with a map representing population density can serve to indicate quality of housing relative to number of occupants. Comparison of these maps with one representing per capita income can provide further indication of social conditions. Additional maps would provide even more indications. However, an analyst would soon reach a point where his ability to use and comprehend additional maps would decline.