Scale is described with appropriate units for the map and earth. These units are different from one another 1 inch to 5 miles 1 centimeter to 16 kilometers o Makes the scale easier to use if you know bot of the units! Or quite hard if you do not as you have to convert the units Graphic Scale o Graphic Scales draw the map unit and do not state it. They only state the earth unit. Useful on web maps Requires the user to understand the earth unit Provide a good quick size or distance estimate Only scale that remains correct when map scale is altered Scale and Detail in Digital Maps o In the digital world, we can “zoom in” and “zoom out” very quickly and easily, so we can see the effects of scale, area coverage, and window size (which we can hold constant) quickly. National Map Accuracy Standards (NMAS) o Applications: Standards established in 1941 by the U.S. Bureau of the Budget to set accuracy standards for all federally produced maps (revised in 1947). United States National Map Accuracy Standards Horizontal Accuracy: For maps on publication scales larger than 1:20,000, not more than 10% of the points tested shall be in error by more than 1/30 inch (0.03), measured on the publication scale; for maps on publication scales of 1:20,000 or smaller, 1/50 inch (0.02). These limits of accuracy shall apply to positions of well-defined points only.