by Verona Hirthe
Published 3 years ago
Updated 2 years ago
How many methods of contouring are present? Explanation: There are 2 methods of contouring: direct and indirect. In direct method, the points of elevation are located physically and then plotted on the map. Indirect method uses contouring with the help of grids.
What are the method of contouring?
There are basically 2 methods of contouring – Direct Method and Indirect Method.Direct Method of Contouring : High degree of precision is required for large-scale maps with small contour interval. ... Indirect Method of Contouring : It is suitable for undulated ground and hilly areas.
How many methods are there in indirect contouring?
Two methodsTwo methods of Contouring are Direct and Indirect Method.
What are the 4 rules of contour lines?
Rule 1 - every point of a contour line has the same elevation. Rule 2 - contour lines separate uphill from downhill. Rule 3 - contour lines do not touch or cross each other except at a cliff. Rule 4 - every 5th contour line is darker in color.
What are the 5 Rules of contour lines?
2.10: Rules of Topographic MapsContour lines always separate points of higher elevation (uphill) from lower elevation (downhill).Contour lines never cross or intersect. ... Contour lines never split or divide. ... Contour lines always close to form a shape, usually an irregular circle.
What is contour and its types?
There are 3 kinds of contour lines you'll see on a map: intermediate, index, and supplementary. 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.
What is direct method of contouring?
Explanation: In the direct method, the contour to be plotted is actually traced on the ground. Points which happen to fall on the desired contour are only surveyed, plotted and finally joined to obtain the particular contour.
What are 4 features on a topographic map?
Topographic maps show contours, elevation, forest cover, marsh, pipelines, power transmission lines, buildings and various types of boundary lines such as international, provincial and administrative, and many others.
What are contour lines?
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.
What are contour lines answer?
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.
What are the 5 basic colors used on a topographic map?
Red for highway classifications, built-up areas, fence lines, and U.S. Public Land Survey lines. Green for areas of woodland, scrub, orchards, and vineyards. Brown for topographic features, including contour lines. Purple for photorevised data, not field checked, consisting of a variety of added features.
What is the shape of contour lines?
At a stream junction, contour lines form an “M” or “W” shape. This can be interpreted as two “V-shaped contours intersecting.
What is a depression contour?
Depressions. Contour lines that show a depression, crater, or sinkhole on a map are represented by dashed lines (hachure marks) on the inside of a contour line. The elevation of the first depression contour is the same as the nearest regular contour line.
Which is are indirect methods of forming contours?
Indirect Method: Their positions are then plotted on the plan and the contours drawn by interpolation. This method of contouring is also known as contouring by spot levels. This method is commonly employed in all kinds of surveys as this is cheaper, quicker and less tedious as compared with the direct method.
What are the methods of contour interpolation?
Interpolation of contour: Following are the three main methods of interpolation; Estimation method. Arithmetic calculation method. Graphical method.
What is Tachometric method of indirect contouring?
Tacheometric Method: Tacheometric method of indirect contouring involves the setting out of the radial lines by making different angles with respect to a reference line. On each of the radial lines, the tacheometric readings are then taken on the levelling staff kept at different points.
Which of the following is an indirect method of survey?
Among indirect methods are surveys, exit interviews, focus groups, and the use of external reviewers.
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