Index contour lines
Every fifth contour line is an Index Contour, distinguished using a heavier line style to enhance identification. All contour lines are solid and unbroken except Intermediate Contour Line. The contour lines falling between index contours are called intermediate contours. They are drawn with a finer line than the index 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 The darker contour lines (like (A)) are called Index Contours. If you follow an index line, you will eventually find a place where the elevation of that line is given . (E) Index. Starting at zero elevation or mean sea level, every fifth contour line is a heavier line. These are known as index contour lines. Typically, each index
Index contours are shown by darker brown lines on the map. These are the contour lines that are usually labeled. The example at right is a section of a topographic
返回到列表. 计曲线. index-contour-line. 地形图上比其他线粗一些的等值线，通常用 其所表示的高度来标注。 根据等值线间距，每4 条或5 条等值线可能是一个计曲线。 Index contours are shown by darker brown lines on the map. These are the contour lines that are usually labeled. The example at right is a section of a topographic 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 8 Mar 2018 Index contours help the map reader get a better feel for the interval (the vertical distance between contours) we use thicker lines to highlight Index contours are bold or thicker lines that appear at every fifth contour line. image of topographic map. If the numbers associated with specific contour lines are 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.
At every fourth or fifth contour line, the line is printed heavier, and labeled with the elevation. These reference lines are called index contours and help to indicate
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
For a quick definition, a contour line joins points of equal and constant values. For example, contours on an elevation have constant heights that are the same on each line. For example, contours on an elevation have constant heights that are the same on each line.
ArcGIS geoprocessing tool that identifies types of contours and applies hypsographic codes to input The interval or distance between index contour lines. 5 Oct 2015 Therefore, an index contour is set to make it easier to read. For the less steep areas, the contour lines are displayed with wider spacing, while 3 May 2008 Every fourth or fifth contour line is shown with a thicker line. This thicker contour line is called an index contour and, if you follow it, you'll
Index contours are less frequent, are shown with a heavier brown line, and are labeled with the corresponding elevation. Some general rules for contour lines
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. A contour line accentuated by a heavier line weight to distinguish it from intermediate contour lines. it is a contour line of elevation Control index contour, or just index contour. Two successive index contours on a map would be 5 meters apart. The interval is how far apart two contour lines are, so since the contour interval is 5 meters the answer is 5 meters.
The brown lines are the contour lines. The thin lines are the normal contours, the thick brown lines are the index contours. Notice that elevations are only marked on the thick lines. Because we only have a piece of the topographic map we can not look at the margin to find the contour interval. But since we know the elevation of the two index contours we can calculate the interval ourselves. To find the elevation interval between contour lines, divide the elevation difference between index lines by the number of contour lines from one index line to the next. In the example above, the distance, 200, is divided by the number of lines, 5. The contour interval equals 200 ÷ 5 = 40, or 40-foot contour intervals.