Design For GIS Component Based On Spatial Direction Reasoning

RS and GPS provide technical support for collection of spatial information, and GIS creates the theoretical and technical architecture of spatial information processing and application from the aspect of quantity. However, spatial information is complex. Considering quantity, spatial information is mass. The kinds of spatial information not only have numerical type, character type, but also have figure type and image type. The correlation between spatial information is inherent. So, quantitative research of spatial information is not enough, and qualitative research is necessary.Qualitative spatial reasoning that is generated by combining qualitative reasoning, spatial reasoning and artificial intelligence (AI) has been a hotspot in the research of AI. Different from the researches of structure, action, function and their interconnections of physical system in qualitative physics, qualitative spatial reasoning analyzes and processes the human cognition of geometric spatial common knowledge. Different from the researches of modeling, descriptions, representations, relations'analysis and processing of spatial objects in spatial reasoning researching, qualitative spatial reasoning faces to the qualitative characters and qualitative relations of spatial objects. Qualitative spatial reasoning researches representation and process of human's qualitative cognition for spatial objects and their relations in geometric space.In geography space, compared with spatial topological relations, spatial direction relations without doubt have more abroad applications and more closed to the human's life, they should occupy more important position and exert greater effect in spatial information field. However, experts obtain little production about direction relations than topological relations research, and there is scarcely any application applying spatial direction relations into GIS software. At present, more and more users are unsatisfied with the simple functions, such as graph query, plotting, so powerful spatial analysis is demanded for GIS in more projects in order to provide exact and timely decision for manager. The existing GIS components just only offer some simple operations with respect to spatial information and attribute data, and they are empty of powerful functions to deal with spatial relations, such as reasoning, analyzing, obtaining spatial relations. Thus, the GIS component with direction reasoning and query functions is instant demand for GIS development.Based on 2-dimensional spatial objects and profound analysis for representation...