7.1.5. Symbolization

• Use of points, lines, and polygons to represent features.

Cartography uses symbols to create maps that show real-world features. Points symbolize specific locations, such as cities or landmarks. Lines represent linear features, like roads or rivers. Polygons illustrate areas, like parks or land parcels. This use of different symbols helps viewers quickly understand what is being represented on the map.

Think of a map as a recipe: just as a recipe uses different icons for various ingredients, like dots for spices or lines for pasta, a map uses points for cities, lines for roads, and polygons for countries to convey information about the landscape.

– Size: Quantity or magnitude.

The size of a symbol on a map often correlates to the quantity or magnitude of the feature it represents. For example, a larger circle might indicate a city with a larger population, while a smaller circle may represent a city with fewer inhabitants. This visual distinction helps to quickly convey the scale of various features.

Imagine using different-sized balls in a game to represent the scores of various teams; larger balls signify higher scores. Similarly, in cartography, a larger symbol on the map indicates a more significant or more populated city.

– Shape: Type of feature.

The shape of a symbol conveys the type of feature being represented. For example, triangles might symbolize mountains, while squares could represent buildings. Different shapes allow map users to instantly identify the nature of features at a glance.

Think about using icons on a phone to represent different apps: a camera icon signals the photo app, while a music note represents the music player. Similarly, distinct shapes on a map signal different geographical or cultural features.

– Color: Thematic differentiation or intensity.

Color is a powerful tool in cartography that aids in thematic differentiation and conveys meaning. For instance, different colors can represent varying land uses, such as residential, commercial, or industrial areas. Additionally, color intensity might indicate levels, such as darker shades representing higher population density.

Consider how traffic lights use color to convey information: red means stop, green means go. In maps, colors similarly direct the viewer's understanding of different areas or themes, guiding them through the information presented.

– Pattern: Texture representation (e.g., forest, water).

Patterns or textures in symbology offer another means of conveying information. For example, a series of dots might represent forests, while wavy lines might symbolize water bodies. These patterns help to visually differentiate between various land uses or geographical features.

Think of how fabric or wallpaper uses patterns to create visual interest. Just as floral designs signify nature, striped patterns may evoke the feel of water, similar patterns on a map give a sense of what kind of landscapes exist in particular areas.

--