Using Text on Maps: Typography in Cartography

Typography is the art and methods of arranging type, type design, and modifying type glyphs. In traditional typography, text is composed to create a readable, coherent, and visually satisfying whole that works invisibly, without the awareness of the reader. Even distribution with a minimum of distractions and anomalies are aimed at producing clarity and transparency.  The goal is legibility and readability.

Typography for cartography can be more complex than traditional typography because of complex text placement and potential density of features, visual hierarchy, and overall look and feel. On maps, text often represent features as symbols in their own right. There is often interplay between text and other multi-layered map features such as symbols, background colors, and textures. However, the overall goal of legibility and readability remains the same.

Felix Arnold (2004) lists several ways in which cartography differs from traditional typography:

  • On maps and plans, text competes with the graphics; in books and magazines, they normally work alongside one another
  • Cannot be placed over backgrounds that share the same color as the letters
  • Typically placed over many various types of backgrounds – which are usually dark – instead of a common white background
  • Small text can be difficult to read when placed over complex, textured backgrounds
  • The eye reads text on a map letter-by-letter, instead of through word shapes
  • Single lines of text often run across the page diagonally, or on a curve
  • Type size and style changes quite a lot on maps
  • Much map text is set in quite small point sizes

Understanding Typeface

A typeface (also known as font family) is a group of fonts, designed to be used in combination and exhibiting similarities in design.

map typography font families
Typographic font families

One member of a family may be rendered in italic, another bold, another condensed or using small caps. Each font of a typeface has a specific weight, style, condensation, width, slant, italicization, ornamentation, and designer or foundry (the variants). For example, “ITC Garamond Bold Condensed Italic” means the bold, condensed-width, italic version of ITC Garamond. It is a different font from “ITC Garamond Condensed Italic” and “ITC Garamond Bold Condensed,” but all are fonts within the same font family.

Individual letters, number, punctuation mark, or other symbol, called the type glyphs, are created and modified using a variety of illustration techniques.

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Serifs are semi-structural details on the ends of some of the strokes that make up letters and symbols (also known as Roman).

Serifs, highlighted in red

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A typeface without serifs is called sans-serif, from the French sans, meaning “without” (also known as Gothic). In traditional print, sans-serif fonts are more typically used for headlines than for body text.

Sans-serif

 

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 Weight, Stretch, Size

The font weight refers to the boldness or lightness of the glyphs used to render the text. The font stretch indicates the desired amount of condensing or expansion in the glyphs used to render the text. The font size refers to the size of the font from baseline to baseline.

As cartographic methods became more mechanical in the mid-20th century, the Leroy Lettering System was developed to help cartographers produce consistent, legible text. The Leroy type style is popular on maps of that era.  Today, the font “Sublime” closely mimics the Leroy style.

Leroy Lettering System (1) Phillips, R. J., Noyes, L. and Audley, R. J. (1977). The legibility of type on maps. Ergonomics, 20, 671-682.

Selecting Fonts for Cartography

The following should be considered in your font selection (Arnold, 2004):

  • The typeface must be legible in small sizes
  • Typeface must also be slightly narrow, to avoid line lengths running too long
  • Different styles and weights of the typeface must be clearly differentiated from one another
  • Individual letters must also all appear different from one another, to help minimize misreadings and misunderstandings
  • Typeface must be able to form good word shapes, which will also directly increase legibility

TypeBrewer is a highly recommended place to begin your selection of type for your map. In the TypeBrewer system, “Formal-B” and “Informal-B” are good choices if you are using pre-loaded system fonts. “Formal B” is a good choice for web fonts. Other listed type schemes require that you obtain fonts from external sources. These provide excellent solutions for cartography, though they can sometimes be expensive.

There are many sources of fonts available for free and for purchase via the web. For example, Cisalpin is a contemporary typeface marketed as the ideal typeface for cartography.

Cisalpin commercially available typeface for cartography

Cartographic Lettering Conventions

 

The following table presents the lettering conventions of a few cartography publishing houses:

Cartographic lettering conventions (The Guild Handbook of Scientific Illustration, Second Edition)

Cartographic convention says to pair a Sarif type family and a Sans-sarif type family on your map. Within each family different variants, sizes, and colors are applied. Most professional cartographers have their favorite pairings. For example, on the CartoTalk forum, the following were listed:

  • Frutiger with Meridien
  • Rotis and Univers
  • Myriad (sans) and Kepler (serif) and/or Adobe Jensen (serif) (traditional look)
  • Nueva (serif) and Tekton (sans) (modern look)

Arrangement

The overall arrangement of type involves the selection of typefaces, point size, line length, leading (line spacing), letter-spacing (tracking), style, effects, and kerning.  In typography, kerning is the process of adjusting letter spacing in a proportional font. In a well-kerned font, the two-dimensional blank spaces between each pair of letters all have similar area.

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