Index Contour Line Definition Geography
It is a plane section of the three-dimensional graph of the function f parallel to the -plane. These are lines that show high and low areas of land.
What Is Contour Interval Its Calculation And Uses In Surveying
Colors and symbols are used to represent other features on the land such as water vegetation roads boundaries urban areas and structures.
Index contour line definition geography. Contour lines represent the shape and elevation of the land such as ridges valleys and hills. For example contours on an elevation have constant heights that are the same on each line. In cartography a contour line joins points of equal elevation above a given level such as mean sea level.
A contour interval is the vertical distance or difference in elevation between contour lines. Contour line a line on a map representing an imaginary line on the land surface all points of which are at the same elevation above a datum plane usually mean sea level. Thinner solid lines called intermediate contours are used to depict lesser elevations that are referenced to the height information provided by the maps legend.
Contour lines are spaced by contour intervals and represent areas on land that lie the same distance above sea level taken to be zero feet 0 by convention. They join together places of the same height and form patterns that help us to imagine what the land actually looks like. A contour line of a function of two variables is a curve along which the function has a constant value so that the curve joins points of equal value.
Index lines are the thickest contour lines and are usually labeled with a number at one point along the line. The ratio of a distance on the map to the corresponding distance on the ground. Contour lines are a maps way of showing you how high the land is.
Most topographical maps contain only the index contour and intermediate contour lines but some also contain supplementary contour lines. Index contours are bold or thicker lines that appear at every fifth contour line. Physical Geography a line on a map or chart joining points of equal height or depth.
Two well-known examples where such lines are commonly are height lines on topographical maps and showing areas with the same pressure or temperature on weather charts. Index contour line A contour line accentuated by a heavier line weight to distinguish it from intermediate contour lines. Contour lines allow you to visualize the 3D world on a 2D map and identify specific features of the landscape such as valleys ridges slopes mountains hills and spurs.
Index contours are usually shown as every fifth contour with their assigned values to facilitate reading elevations. All the points where the function has the same value are connected. Collins English Dictionary Complete and Unabridged 12th Edition 2014 HarperCollins Publishers 1991 1994 1998 2000 2003 2006 2007 2009 2011 2014.
There are 3 kinds of contour lines youll see on a map. Contour lines are an application of level sets. This is an essential skill needed when using topographic maps to navigate in the wilderness or areas that lack identifiable man-made features 2.
That covers a quadrangle that measures 75 minutes of longitude and latitude on all sides so these are also referred to as 75-minute maps quadrangle maps or quad maps modern topographic maps for Alaska have a scale of 125000 and cover a variable distance of longitude. The index contour represents the vertical scale on a map region by a thick solid line with the various elevations printed on it. For a quick definition a contour line joins points of equal and constant values.
A figure on a compass map nautical chart or monument used to display the orientation of the cardinal directions. A map of Stove with height lines. This tells you the elevation above sea level.
CONTOUR LINES Contour lines connect places of equal altitude Contour lines depict various landforms on a map By reading the contour lines we can determine what the terrain in an area looks like. Each topographic map has a unique name. When they are far.
The diagram illustrates how contour lines show relief by joining points of equal elevation. The contour lines join up areas of the same height and when they are close together it means the hill or mountain is steep. Intermediate index and supplementary.
A contour line is a line drawn on a topographic map to indicate ground elevation or depression. A contour map is a map illustrated with contour lines for example a topographic map which thus shows valleys and hills and the steepness or gen. For example contours on an elevation have constant heights that are the same on each line.
This chapter starts with tips on how to read the margins of a topographic map. They usually dont have a number label. North East South and West.
From Longman Dictionary of Contemporary English contour contour ˈkɒntʊə ˈkɑːntʊr noun countable 1 SHAPE the shape of the outer edges of something such as an area of land or someones body the contours of the hills the contours of her face 2 also contour line SG a line on a map that shows points that are of equal heights above sea level Examples from the Corpus contour Science in this sense came to stand as a meta-discourse framed by the broader contours of the. Contour maps offer a deceptively high amount of information when analyzed skillfully and can be accessed on command using online mapping sites and applications. Intermediate lines are the thinner more common lines between the index lines.
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