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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.
The latitude and longitude coordinates of NRCan maps are found along the edge of a map (for example see the map of Canadian geology we studied in Chapter 1). On USGS topographic maps the latitude and longitude coordinates are found at the corners of the map (Figure 7.2).
- Karla Panchuk
- 2020
A contour diagram is, in essence, a \topographical map" of the graph of z = f(x; y). A topographical map is a two-dimensional visualization of three-dimensional terrain through the so-called level curves or contours corresponding to points of equal elevation. Example 1.
Aug 31, 2019 · Constructing a topographic map by drawing in contours can be easily done if a person remembers the following rules regarding contour lines: Contour lines represent lines connecting points of equal elevation above sea level; Contour lines never cross, split, or die off
- When Should I Construct A profile?
- How Do I Construct A Topographic profile?
- Where Are Smooth Curves Used in The Geosciences?
- References and Resources
In introductory geoscience courses, a profile is appropriate when you are asked to construct a cross-section. Topographic profiles are used to understand what a topographic map is telling you in a specific area (or, you can think about it as giving you a "side view" of the landscape along a specific line on the map). Interestingly, many geologists ...
Examine the topographic map image to the left (you can click on the image to make it larger, or you can download the map and a profile (Acrobat (PDF) 2.3MB Jul18 11) to try the steps below on your own). Before you start, you might want to review some of the rules about topographic maps (you can find rules at Idaho State U.'s field exercise, U. of M...
Topographic profiles are used in many applications in the geosciences. Some of the topics where you will need to recognize and draw a topographic profile are: 1. topographic maps 2. earthquakes 3. structural geology (and geologic cross-sections) 4. glacial geology 5. coastal geology 6. geomorphology
Several universities have tutorials on how to construct a topographic profile. Here are just a few: 1. University of Wisconsin, Stevens Point, has a flash animation to walk you through the construction of a profile. 2. Idaho State University has step-by-step instructions for constructing a topographic profile. 3. University of Texas at Austin has s...
Aug 18, 2022 · Topographic Contours. Many maps of land areas have series of curved lines, called contours, that represent the topography of the area. Such a map is called a topographic map. A contour is a horizontal curve that’s the locus of all points on the map with the same elevation (Figure 3-35).
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After completing this chapter, you should be able to: Recognize topographic patterns and geologic patterns; Read and construct contour lines; Determine gradients; Read map scales and convert fractional scales; Construct a topographic profile
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