![]() Choropleth maps are thematic maps with colored or shaded measurements of the thematic variable aggregated over defined spatial units, such as counties. Thematic maps display spatial variation of a specific variable, for example, demographic data, in a geographic area. (2018) used object-based analysis to digitize a civil war map and aerial photos.Ĭurrently, there are many thematic maps that are not digitized and yet may provide a valuable resource for research. Early adopters include Sharma (2006) and Bracke, Miller & Kim (2008), who published similar techniques for digitization of old maps. This digitization method may not be novel, but it is seldom disseminated as an alternative to rigorous and monotonous digitization by hand for archived materials. The GIS community has not yet taken full advantage of this powerful tool, perhaps due to unfamiliarity ( Chen et al., 2018) and many potential applications are unrealized, including research of historical maps and geographies using object-based image analysis for rapid digitization. Indeed, Trimble, a geospatial company, acquired eCognition object-based image analysis software from a medical imaging company ( Trimble, 2010). Current application and development of object-based image analysis primarily is for remote sensing objectives of land use and cover mapping, but this analysis can be applied to achieve other objectives. ![]() Object-based image analysis is a relatively new avenue of research, with few publications referencing use before 2010 ( Chen et al., 2018). Researchers increasingly are developing and improving tools that can be applied to a range of topics.
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