Geographical data is plotted on a map projection. The most common are Albers and Mercator. Select the most appropriate map projection for your data. Use the Mercator projection to preserve angles and shapes in small areas. The Mercator projection is also good for presenting connection maps that show the routes and paths for directions. The standard Albers projection can be used to present U.S. census or government data. This equal-rectangular projection is a good option for thematic world mappings.