based on: While many maps look simple, often cartographers have used a tremendous amount of data to draw them. For example, a map that shows the population of each county in the United States (by using different colors to represent certain population levels, such as "under 5000 people," "between 5000 and 10,000 people," and so on) uses data collected by the U.S. Census Bureau. When looking at the map shown in Figure 1.1, it can be easy to forget that the Census Bureau collected much of that information from millions of individual questionnaires that Americans filled out during the official U.S. census, which occurs every 10 years. In other words, maps are the result of data aggregation, which is the process of collecting and organizing large amounts of information. Data can be aggregated at the scale analysis of an individual or family or at a scale analysis of a country or the entire world. How do map aggetate data