How to Read Topographic Maps

A topographic map (also known as an elevation map) is a map that illustrates height or depth. The key to reading this map is to simply use the key.

Difficulty: Moderate

Instructions

Things You'll Need:

• topographic map

1. 
   Topographic maps show heights

   Notice a topographical map has a variety of colors.
   
   Usually these colors radiate out concentrically. In other words, they look almost like bulls-eyes only the rings are not perfect circles. They are organic in shape.

2. 
   Topographic maps are color coded

   Notice that the colors gradate.
   
   The colors on a standard topographic map will usually gradate. That is, they radiate out in an order that corresponds with the color wheel: blue, green, yellow, orange, red, and so on, with variations in between.

3. 
   Topographic maps have keys to explain.

   Look for the map key.
   
   The map key will tell you the elevation that each color represents, within a range. For example, it might show you that anything colored green is 0 to 500 feet tall.

4. Be aware that standard topographic maps follow the general rule that dark green is around sea level, light green is higher, yellow higher, orange higher, brown is higher, and purple is highest. Again, check the map key for precise elevation for the specific map that you are looking at.

Tips & Warnings

• Not all elevation maps use standard colors. Check the map key for the specific map you are looking at.