Definition

Noun: A contour map is a type of map that uses contour lines to represent the three-dimensional shape and elevation of the land surface on a two-dimensional plane. Each line connects points of equal elevation above a specified reference level, such as sea level.

Usage

A contour map is used to visualize topography, showing hills, valleys, slopes, and depressions. The spacing of the lines indicates steepness: closely spaced lines represent a steep slope, while widely spaced lines represent a gentle slope.

Examples

• Noun:
  • The hikers studied the contour map to plan the least strenuous route up the mountain.
  • Geologists use contour maps to understand the underlying structure of a region.

Advanced Usage

• Creating/Interpreting a Contour Map: The process involves surveying elevation data and drawing lines to connect points of equal value. Interpreting it requires understanding how the lines represent the landscape's form.
  • The ability to read a contour map is an essential skill for surveyors and outdoor enthusiasts.

Variants and Related Words

• Topographic Map (n): A more general term for a large-scale map that shows both natural and man-made features, typically using contour lines to represent relief. A contour map is a key component of a standard topographic map.
• Contour Line (n): A single line on a map joining points of equal elevation.
  • Each contour line on the map represents a specific elevation.

Synonyms

• Topographic Map: While often used interchangeably, a topographic map usually contains more detail (e.g., roads, vegetation) in addition to contour lines.
• Relief Map: This can refer to a physical 3D model or a 2D map using shading or contours to show elevation differences.

Related Phrases/Concepts

• Contour Interval: The constant difference in elevation between successive contour lines on a map.
  • The contour interval on this map is 10 meters, meaning each line is 10 meters higher than the previous one.
• Index Contour: A bolder or thicker contour line that is usually labeled with its elevation to make the map easier to read.

Noun

1. a map having contour lines through points of equal elevation