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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.
28 sie 2023 · Index Contours: Thicker or labeled contour lines are known as "index contours." They typically carry elevation labels and help users quickly identify the elevation of the land at specific points on the map.
A contour map consists of contour lines of a given geographical region. To keep the contour map simple and easy to read, not every contour line is marked with its elevation reading. These marked or labeled lines are known or termed as Index Contour Lines.
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.
5 lut 2022 · Learn what contour lines are and how to read them on topographic maps. Contour lines mark points of equal elevation and show the shape and slope of the terrain. Index lines are the thickest and labeled lines that indicate the elevation above sea level.
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.
