Dot Density Map: A thematic map that places dots within an enumeration unit in
proportion to the represented value to maintain the distribution and variation of
density of a phenomenon of interest (Dent et al. 2018; MacEachren and DiBiase
1991).
Flow Map: A thematic map that represents the route and/or magnitude of a
phenomenon alongside linear objects or between locations (Lechner et al. 2009).
Graduated Symbol Map: A classified proportional symbol map of interest (Gao et
al. 2019).
Isoline/Isarithm: A line derived via interpolation that connects points of equal
attribute value on a map of interest (Childs 2004).
Isoline Interval: The numerical distance between successive isolines/isarithms of
interest (Chibryakov 2021).
Isometric Map: A thematic map that makes use of isolines as a result of
interpolating values collected at sample points of interest (Steele et al. 1998).
Isoplethic Map: A thematic map that makes use of isolines on account of
interpolating values enumerated across areas of interest (Yang and Shang 2013).
Proportional Symbol Map: A thematic map that scales the size of a point symbol
proportional to the represented value of interest (Dent et al. 2018).