GIS: Contour maps are a fundamental component of GIS, which is used for spatial analysis, urban planning, natural resource management, and more. Steeper terrain might require a smaller interval to accurately depict elevation changes. Spot elevations are used in larger open areas showing elevations so the viewer knows that a contour line was not missed in large flat areas.Ĭontour Interval Selection: The choice of contour interval depends on the scale of the map and the terrain's complexity. They are used to show the top of a hill that is above the contour line, but not high enough to make drawing a contour line at the next interval. Spot Elevations: Spot elevations go on the tops and saddles of the elevation terrain. For hills, the highest point is found at the center of concentric contour lines. Inside a closed loop, the elevation is lower than the contour line values. 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.ĭepressions and Hills: Contour lines form closed loops around depressions (like valleys) and hills. When contour lines are close together, it signifies a steep slope, whereas widely spaced lines indicate flatter terrain. Topography Representation: Contour maps effectively illustrate the topography of an area, showing features like hills, valleys, ridges, and depressions. A smaller contour interval provides more detailed information about elevation changes but results in more contour lines on the map. Closer contour lines indicate steeper slopes, while widely spaced contour lines indicate more gradual slopes.Ĭontour Interval : The contour interval is the difference in elevation between two adjacent contour lines. Each contour line represents a specific elevation value, and the interval between contour lines is known as the "contour interval." The spacing between contour lines reflects the steepness of the terrain. Contour Lines : Contour lines are continuous lines on a map that connect points of the same elevation.
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