Cartography
Cartography Week 12, Lecture 2: Miscellaneous **Clicker Quiz Land uses are nominal categories, hence the palette with a discrete colour different than its neighbours is acceptable (Qualitative palette) Quintiles: data classification technique used to determines using the number of features to be mapped
Scaling of graduated and proportional symbols Refers to the size of symbol in relation to the data
Two Kinds: Graduated and Proportional A) Graduated Symbols
Range grading: single symbol size to represent a range of data values Three decisions: o Number of classes o Method of classification: same as choropleth o Symbol sizes: ArcMap default provides a graduated range based on equal increments of point size data
B) Proportional Symbols
Mathematical: function applied to attribute vale, most commonly square root, to determine the diameter of the symbol Perceptual: numerous empirical studies have shown perceived size of proportional symbols does not correspond to mathematical size of larger symbols o ArcMap—called Appearance compensation (Flannery)
Reviewed maps, used clicker to ‘grade’ maps
Scaling of graduated and proportional symbols Refers to the size of symbol in relation to the data
Two Kinds: Graduated and Proportional A) Graduated Symbols
Range grading: single symbol size to represent a range of data values Three decisions: o Number of classes o Method of classification: same as choropleth o Symbol sizes: ArcMap default provides a graduated range based on equal increments of point size data
B) Proportional Symbols
Mathematical: function applied to attribute vale, most commonly square root, to determine the diameter of the symbol Perceptual: numerous empirical studies have shown perceived size of proportional symbols does not correspond to mathematical size of larger symbols o ArcMap—called Appearance compensation (Flannery)
Reviewed maps, used clicker to ‘grade’ maps
