Before you Map: Audience, Medium, and Purpose
There is no inherently good map—only a map that is well-designed and properly suited to its audience, medium, and purpose. Before creating a map, you should ask yourself (and if possible, your clients) several questions (Brewer 2015).
Audience—who is going to use this map?
- Will your map readers be novices or experts? Do they have advanced knowledge related to the data you intend to map? You would create, for example, a different map of crime hotspots for criminologists than for the public.
- Are your intended map readers knowledgeable about the area to be mapped? Those unfamiliar with a location might need more detail to understand its geographic context.
- How much time will a typical reader spend with your map? Some audiences will be happy to explore and analyze your map, while others may hope to understand the message of your map at a glance.
- Is your map accessible? Consider how colorblindness or other visual impairments might affect your readers’ interpretation of your map.
Medium—how will this map be displayed?
- Maps are viewed in a vast number of formats—in desktop browsers, on mobile phone screens, in brightly-lit rooms on large-screen projectors, as well as printed in magazines, brochures, newspapers, posters, etc.
- In addition to the broad media category (e.g., mobile phone browser vs. poster), predict the specifics of your map's final viewing format as much as possible—details such as the map’s size on a webpage or a reader’s viewing distance from a poster can make a big difference in both a map's utility and aesthetics.
- If your map will be viewed in multiple media formats, you will likely have to create multiple versions of your map, each optimized for its respective display medium.
Purpose—what is the intended function of your map?
- Maps are used for many purposes (e.g., for navigation, for understanding spatial trends in data, for site selection, for communicating the results of a research project, etc.) Different purposes necessitate different maps.
- When making design decisions, consider how they will influence the success of your users in completing their expected map-use tasks. Maps for driving navigation, for example, are generally more useful when detailed terrain data is excluded, creating a simpler interface. In a hiking map, however, such information is essential.
- Considering in what scenarios a map will be used is also important—users of maps for emergency response, for example, will likely be stressed and working under inflexible time constraints.
In this course and beyond, you will make many different kinds of maps. Some will be advertisements, some will be scientific documents - some may be just for fun. No matter the mapping project or process you use, pausing to reflect upon the who, what, and why of your map will always lead to better results.
Consider a mobile or desktop mapping application that you use frequently, such as Google Maps. What changes might you make to this mapping tool if a client asked you to alter it for a different, singular purpose—for example, as a wayfinding tool for young children, or for assisting police during emergency response?
Chapter 1: Planning Maps. Brewer, Cynthia. 2015. Designing Better Maps: A Guide for GIS Users. 2nd ed. Esri Press. (note: pages. 1-3 are required reading for this lesson, but you may find the rest of the chapter helpful as well.)