Map symbology: How to choose effective symbols for web maps
Blog post from Felt
Map symbology is the cartographic use of visual elements such as color, size, shape, patterns, and line styles to represent geographic features and make spatial data more understandable. Effective symbology improves readability, establishes visual hierarchy, reveals patterns, and supports faster decisions by giving users a consistent visual language across maps. Point, line, and polygon symbols represent locations, routes or networks, and bounded areas, respectively, while styling choices vary according to whether data is categorical, quantitative, or continuous. Sequential, diverging, and qualitative color schemes, along with proportional sizing, recognizable shapes, transparency, textures, and directional line indicators, can communicate different types of spatial relationships and magnitudes. The text also emphasizes that organizations benefit from standardized symbology conventions across teams and projects, and presents cloud-native GIS platforms such as Felt as tools for maintaining consistent styling, connecting large data sources, and enabling collaborative mapping at enterprise scale.
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