What do gray alternate colors on a map represent?

On a topographic map, gray alternate colors primarily serve as an alternate representation of certain features, notably where brown typically indicates elevation and contour lines. The use of gray is not exclusive to any one feature but is often employed to enhance the map's readability and to distinguish different types of data effectively.

The brown color traditionally represents terrain features, particularly contours and elevation changes. When gray is used as an alternate, it aids map readers in identifying these features in a more accessible manner without overwhelming them with color variations that could lead to confusion. This strategic use of color improves clarity on the map and allows users to interpret the terrain accurately.

This understanding highlights the importance of color in conveying information in map design, enabling effective navigation and land navigation skills.