What is a index contour line
1. Index lines are the thickest contour lines and are usually labeled with a number at one point along the line. This tells you the elevation above sea level. 2. Intermediate lines are the thinner, more common, lines between the index lines. They usually don't have a number label. Typically one index line occurs for every five intermediate lines. 3. A contour line (also isoline, isopleth, or isarithm) 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. It is a plane section of the three-dimensional graph of the function f ( x , y) parallel to the ( x , y )-plane. This reference line is an index contour. As noted earlier, an index contour is one that is a bolder, darker contour line and has a value written on the line ever so often. As noted earlier, an index contour is one that is a bolder, darker contour line and has a value written on the line ever so often. A contour line is a line drawn on a topographic map to indicate ground elevation or depression. A contour interval is the vertical distance or difference in elevation between contour lines. Index contours are bold or thicker lines that appear at every fifth contour line. 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. Imagine a land surface inundated by the sea to a depth of 100 feet (30.5 metres)—that is, the intersection of a horizontal plain with the uneven surface Index Contours: Topographic maps may have many contour lines. It is not possible to label the elevation of each contour line. To make the map easier to read every fifth contour line vertically is an index contour. Index contours are shown by darker brown lines on the map. These are the contour lines that are usually labeled. The thick lines are known as "index lines" and are labeled with a number revealing the elevation. The thinner, unmarked contour lines between the index lines are called "interval lines." Use the elevation marked on index lines to calculate the elevation of interval lines.
29 Jan 2017 For example, contours on an elevation have constant heights that are the same on each line. Are these contour lines mountains or depressions?
index contour line A contour line accentuated by a heavier line weight to distinguish it from intermediate contour lines. Index contours are usually shown as every fifth contour with their assigned values, to facilitate reading elevations. An index contour is one of the ways that vertical dimension, or vertical scale, is demonstrated on a topographical map. The index contour represents the vertical scale on a map region by a thick solid line with the various elevations printed on it. Definition of index contour A contour line shown on a map in a distinctive manner for ease of identification, being printed more heavily than other contour lines and generally labeled with a value (such as figure of elevation) along its course. An isoline is a contour line that portays elevation in terms of slopes, pits, and peaks. A contour map, such as a topographic map, shows hills, valleys, and the steepness of various slopes.
Contours: Ninety percent (90%) of all contour lines shall be correctly plotted to M) between intermediate contours and 5 meters (5 M) between index contours.
These heavier contour lines are known as index contours because they generally have elevations printed on them. Whenever reporting the contour interval it is Most, if not all, USGS topo maps state the contour interval in the map's margin. Index Contours and Intermediate Contours. As seen in the picture below, each
A contour line is a line drawn on a topographic map to indicate ground elevation or depression. A contour interval is the vertical distance or difference in elevation between contour lines. Index contours are bold or thicker lines that appear at every fifth contour line.
As regular hill visitors, we know that contour lines are used to illustrate a 50m there is a darker and thicker line shown, which is what we call an INDEX contour. To determine the contour interval of a point, you must have a reference line from which to start. This reference line is an index contour (major contour line). How many lines are there between the two index contours? [There are 5 contour lines between index contours.] –. A contour interval is the vertical distance Contour lines allow you to visualise from a map the slope and undulation of the a value for each line, so instead, every 50m or 100m there is an index contour, 29 Jan 2017 For example, contours on an elevation have constant heights that are the same on each line. Are these contour lines mountains or depressions? 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
Index contours are shown by darker brown lines on the map. These are the contour lines that are usually labeled [5]. Fig. 1 Section of a topographic map. The
Contour lines, or isohypses, Index Contours are used to label the Contour Interval: Horizontal distance between two contours. • Close together: Steep slope.
As noted earlier, an index contour is one that is a bolder, darker contour line and has a value written on the line ever so often. First, find the value of the index contour addressed in the question and then follow the line until you see a number associated with the line. Because it's impractical to mark the elevation of every contour line on the map, the index contour lines are the only ones labeled. The index contours are a darker or wider brown line in comparison to the regular contour lines. You'll see the elevations marked on the index contour lines only. To determine elevations, pay attention to the amount of space in between lines. If the contours are close together, you're looking at a steep slope. Index Contours: Topographic maps may have many contour lines. It is not possible to label the elevation of each contour line. To make the map easier to read every fifth contour line vertically is an index contour. Index contours are shown by darker brown lines on the map. These are the contour lines that are usually labeled. 1. Index lines are the thickest contour lines and are usually labeled with a number at one point along the line. This tells you the elevation above sea level. 2. Intermediate lines are the thinner, more common, lines between the index lines. They usually don't have a number label. Typically one index line occurs for every five intermediate lines. 3. A contour line (also isoline, isopleth, or isarithm) 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. It is a plane section of the three-dimensional graph of the function f ( x , y) parallel to the ( x , y )-plane. This reference line is an index contour. As noted earlier, an index contour is one that is a bolder, darker contour line and has a value written on the line ever so often. As noted earlier, an index contour is one that is a bolder, darker contour line and has a value written on the line ever so often.