Just Just How Elevation is Represented on Maps
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- M.A., Geography, Ca State University – Northridge
- B.A., Geography, University of California – Davis
In geography, an area’s relief may be the distinction between its greatest and cheapest elevations. As an example, with both hills and valleys in your community, the area relief of Yosemite National Park is impressive. a two-dimensional relief map shows the topography of the provided area. Real relief maps have raised areas that represent various elevations. (You’ve probably seen them in college.) Nonetheless, if you are opting for a hike, they may be not to practical to hold in your pocket.
Flat Maps
Flat maps represent relief in lots of ways. On older maps that are flat you might see areas with lines of varied depth to express variants within the steepness of places. The lines, the steeper the area with this technique, known as “hachuring,” the thicker. As mapmaking evolved, hachuring had been replaced by shaded areas that represented variants into the steepness associated with the land. These kinds of maps may show altitude notations also at different areas in the map to provide watchers some context.
Variations in level on flat maps also can also be represented utilizing various colors—usually lighter to darker for ascending elevations, aided by the darkest areas being the farthest above ocean degree. The downside with this particular method is the fact that contours within the land do not arrive.
Reading Topographic Maps
Topographic maps, that also are kinds of flat maps, usage contour lines to express level. These lines link points which are in the level that is same which means you realize that whenever you travel from a single line to a different, you will be either increasing or down in level. The lines also provide figures to them, specifying which level is represented by the true points linked by that line. The lines keep a consistent period between them—such as 100 foot or 50 meters—which are going to be noted when you look at the map’s legend. While the lines get closer together, the land becomes steeper. In the event that figures become reduced from hills as you move toward the center of an area, they represent the site of a depression and have hash marks on them to distinguish them.
Common Uses for Topographic Maps
You will find topographic maps in sports shops or websites on the internet that focus on outside enthusiasts. Since topographic maps additionally show water depths, places of rapids, waterfalls, dams, motorboat ramp access points, intermittent streams, wooded marshes and swamps, sand vs. gravel beaches, sandbars, seawalls, breakwaters, dangerous stones, levees, and mangroves, they truly are excessively helpful to campers, hikers, hunters, and anybody going fishing, rafting, or sailing. Topographic maps additionally reveal aboveground and pipelines that are buried in addition to energy and phone poles, caves, covered reservoirs, cemeteries, mine shafts, open-pit mines, campgrounds, ranger channels, wintertime activity areas, and dust roads that likely will not show up on your fundamental roadmap.
While topography relates to secure, a chart that displays the varying depths of water is named a bathymetric chart or map. These types of charts may also show differences in depths via color-coding in addition to showing depths with lines as on a topographic map. Surfers might review bathymetric maps of beaches to be able to find places where waves will likely break larger than in the areas (a high ascent in proximity to a coastline means bigger waves).
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