U.S. Census Summary Tape File and DDViewer . One of the more important features of both the concentric zone and sector models of land use was that residential areas are likely to be differentiated according to a number characteristics. In the case of Charlotte, North Carolina race is a differentiating charcateristic of residentail areas as shown in Map 3. Areas shaded in yellow have the lowest proportion of African Americans and areas shaded in brown have the highest proportion. Differentiation is common in American cities and Charlotte is no different in that respect.
Social areas are also evident along other socio-economic dimensions.
U.S. Census Summary Tape File and DDViewer . Household income is another feature that distinguishes neighborhoods. Continuing with the Charlotte example, Map 4 illustrates the distribution of households by income level. There are several features of this map that are noteworthy. First, as indicated by the brown portions of the map, higher income households generally tend to live further from the central city.