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A topographical map contains curved lines called contour lines. Each contour line corresponds to the points on the map that have equal elevation (Figure 1). A level curve of a function of two variables [latex]f\,(x,\ y)[/latex] is completely analogous to a counter line on a topographical map.
Part 1: Develop your topographic map reading skills by working with simplified diagrams that illustrate key elements of topographic maps. Part 2: Practice your map reading skills by interpreting snippets from topographic maps.
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A contour line (also known as a level curve) for a given surface is the curve of intersection of the surface with a horizontal plane, z = c. A representative collection of contour lines, projected onto the xy -plane, is a contour map or contour plot of the surface.
The relief for a topographic map is easily calculated by finding the highest and lowest contour line elevations on the map; you then subtract the two values to determine the vertical relief represented in the map.
- Karla Panchuk
- 2020
To order a Canadian topographic map, you must know either the location (longitude/ latitude) or the name of your area of interest (e.g. a major city, or a large body of water). You may also order by map sheet number. Paper index maps are available from local map dealers and at map libraries across Canada.
How are topographic maps able to show three-dimensional objects like hills on a two-dimensional object like a piece of paper? They do it by using contour lines. Contour Lines are curves that connect points of equal elevation. Each contour line on a map has a number that represents the elevation of the line (usually the height above sea level).
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What is a level curve on a topographical map?
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What does a topographic map show?
One special kind of map is called a topographic map. It has contour lines to show the shape and elevation of the land. They are sometimes called "level lines" because they show points that are at the same level. Here's how contour lines work: The top of this drawing is a con-tour map showing the hills that are illustrated at the bottom.
