手法を比較

	Cartogram Construction	Spatial Gini Concentration Index
分野	Human Geography	Human Geography
系統	Process / pipeline	Process / pipeline
提唱年	2004	1991
提唱者	Cartogram tradition (diffusion method by Gastner & Newman; circular method by Dorling)	Corrado Gini (coefficient); locational adaptation in regional science / economic geography
種類	Map transformation that rescales region area to represent a variable	Descriptive index of how unevenly an activity is distributed across space
原典	Gastner, M. T., & Newman, M. E. J. (2004). Diffusion-based method for producing density-equalizing maps. Proceedings of the National Academy of Sciences, 101(20), 7499–7504.	Duncan, O. D., & Duncan, B. (1955). A methodological analysis of segregation indexes. American Sociological Review, 20(2), 210–217.
別名	Value-by-Area Map, Area Cartogram, Density-Equalizing Map, Anamorphic Map	Locational Gini Coefficient, Spatial Gini Index, Geographic Concentration Index, Gini Index of Spatial Inequality
関連	4	4
概要	A cartogram is a map in which the area of each region is rescaled so that it is proportional to some variable — population, votes, GDP — rather than to its true geographic size. The aim is to correct the visual bias of ordinary maps, where large but sparsely populated regions dominate the eye while small, populous ones nearly vanish, by making each region as big as the quantity it represents. Cartogram construction is the family of techniques that produce these value-by-area maps, ranging from contiguous density-equalizing diffusion to non-contiguous circle and rectangle methods, each balancing the accuracy of areas against the recognizability of shapes.	The spatial (or locational) Gini concentration index adapts the classic Gini coefficient to geography, summarizing in a single number between zero and one how unevenly an activity — an industry, a population group, a resource — is distributed across spatial units relative to a benchmark such as total population or land area. It is the workhorse measure for quantifying geographic concentration and agglomeration in economic geography.