Map analysis and modelling "What distinguishes a gis from other types of information systems are its spatial analysis functions. These functions use the spatial and non-spatial attribute data in the gis database to answer questions about the real world” -Aronoff, 1989, pp 189
Analysis or modelling? a The advantage a GIS can provide is the capability for transforming the original spatial data to answer users questions Such transformations are often referred to as data analysis" capabilities in GIS o However, most so-called"analysis " capabilities of today's GIS are in fact data manipulation and maintenance functions, very rare of them are actually tell us something by "analysing spatial data
Definitions 白 What is" analysis"? O Analysis specifies data transformations which are ana lytic ca a"Analysis" is the process to resolve and separate the reference system into its parts to illuminate their nature and interrelationships, and to determine general principles of behaviour. 白 What is" modelling"? a Modelling specifies data transformations which involve the synthesis of information a The"synthesis"is the process to put together expressions of general principles with representations of parts of the reference system so as to form a replica that exhibits behaviour similar to that of the reference system
Analysis versus modelling CA theory is the product of analysis CiA model is the product of syntheses, using theory
Spatial analysis and GIs a Geographical analysis allows the study of real world processes by developing and applying models OA GIS enhances this process by providing tools which can be combined in a meaningful sequences to develop new models. These models may reveal new or previously unidentified relationships thus increasing our understanding of the real world a Results of geographical data analysis can be communicated with maps, reports, or both