A map key is a set of instructions used to understand the symbols, colors, and representations on a map, making the map's information decipherable. It's essential for interpreting what different features on the map actually mean.
Essentially, a map key (often also referred to as a map legend) acts as a decoder for the map. It explains the various symbols used to represent real-world features like:
- Roads: Different types of roads (highways, local roads, etc.) are often represented by lines of varying thickness, color, or style.
- Rivers and Lakes: These are typically shown in blue.
- Buildings: Often depicted as small squares or rectangles.
- Landmarks: Specific symbols might represent hospitals, schools, parks, or other points of interest.
- Elevation: Colors or contour lines might be used to show changes in elevation.
A map key is crucial because without it, you wouldn't know what any of these symbols represent. Imagine trying to navigate with a map where you don't know what the blue lines mean – are they rivers or something else? The key eliminates this confusion.
While a map key often includes symbols and colors, a map legend often encompasses a broader range of information, including explanations of symbols, colors, scale, orientation (usually indicated by a north arrow), and potentially even information about data sources and map projections. In practical use, the terms "map key" and "map legend" are frequently used interchangeably.
In summary, the map key is your guide to understanding the visual language of a map.
