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Contour
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- A contour is a horizontal curve that’s the locus of all points on the map with the same elevation (Figure 3-35).
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.
Nov 3, 2022 · A dynamic map showing 3DEP 1-meter DEM availability for the United States and its Territories. This map is created using services from The National Map. Use The National Map Viewer to explore GIS data, see availability of USGS topographic maps, and create your own web 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
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).
A topographic map is an extremely useful type of map that adds a third dimension (vertical) to an otherwise two-dimensional map defined by the north, south, east, and west compass directions.
Level curves are the equivalent of contours on a topographical map. In such a map the terrain is shown by drawing curves through all points which have the same height above sea level. The numbers on the curves in the map shown below are the heights above sea level in metres.
Explain how to read and interpret a topographic map. Explain how bathymetric maps are used to determine underwater features. Describe what a geologic map shows.
