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index contour line. [symbology] On a topographic map, a contour line that is drawn with a thicker line symbol than the intermediate contour lines and usually labeled with the elevation that it represents. Depending on the contour interval, every fourth or fifth contour line may be an index contour.
27 cze 2024 · Index contours are a type of contour line. They are distinguished by their thickness or boldness and occur at regular intervals, usually every fifth contour line. The primary purpose of index contours is to provide a clearer representation of the terrain’s elevation changes.
5 lut 2022 · 1. Index lines are the thickest contour lines and are usually labeled with a number at one point along the line. This tells you the elevation above sea level. 2. Intermediate lines are the thinner, more common, lines between the index lines. They usually don't have a number label. Typically one index line occurs for every five intermediate ...
A contour map is a graphical representation of the terrain or surface of an area. Instead of showing mountains, valleys, and other features in 3D, it uses lines, called contour lines, to represent these features in 2D. 💡 Jump straight to How to Create a Contour Map.
7.3 CONTOUR LINES. Contour lines allow us to add a vertical dimension to a plan view map. Contour lines represent elevations above sea level at specific intervals within a map area.
31 sie 2019 · Instead, every 5 th contour line is labeled with an elevation, and is darkened; such a contour line is called an index contour. The use of index contours allows a map to be visually more appealing, especially when the contour lines are numerous and closely spaced to one another.
23 sie 2023 · Index contours are commonly used as a cartographic aid to assist in the visualization of contour lines. In a contour map, index contours are usually symbolized with a thicker line symbol to differentiate the index contours from intermediate contours.
