Visual Variables: System of Graphics

This lecture explores the system of graphics used in cartographic representations, focusing on visual marks, visual variables, and their properties. It discusses the proper usage of these elements and their implications for information perception, emphasizing the importance of visual grammar and semiology in regulating their use. The lecture delves into the interactions between visual marks, the properties of visual variables such as position, size, value, shape, orientation, hue, and resolution, and their zonal implications. It also covers the system of graphics, including the eight visual variables, types of objects, properties, and relationships. Additionally, it addresses the internal variation of visual variables, class thresholds, the effectiveness of images, and the computational encoding of colors.