Abstract: Heat map is an intuitive and accurate presentation tool for spatial observation, which is wildly used in many fields. Based on analyzing and setting the various layer weights and technical grades of road, the methods of inverse distance weight, histogram equalization, density compensation and repetitive parameter iteration are used comprehensively. And this paper constructs the rule architecture of heat map to demonstrate the distribution state and development level of roads in certain region. The heat map rule architecture describes the rules of road weighting, line-to-surface modification, dot density adjustment and liner fitting, and so on, which can extract and demonstrate road development level accurately. Based on road data in some some Asian and African countries of global geographic information construction projection, information abstraction and heat map distribution test have been done to verify the feasibility and reliability of the rules.

Key words: road network constraints, kernel density analysis, heat map, geographic object, road weighting