- 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.
What are the indirect methods of contouring?
These methods are commonly employed in small scale surveys of large areas or during mapping of irregular surface or steep slope. There are two different ways usually employed for indirect method of contouring:
Grid method and
.
Radial line method
.
Which method is the most accurate method of contouring?
- A quick-method.
- Adopted for large surveys only.
- Most accurate method.
- Suitable for hilly terrains.
What is contour line method?
Contour lines are
curved, straight or a mixture of both lines on a map describing the intersection of a real or hypothetical surface with one or more horizontal planes
. The configuration of these contours allows map readers to infer the relative gradient of a parameter and estimate that parameter at specific places.
How many methods of contouring are there?
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 is grade contouring?
Contour grading means
grading that creates or results in land surfaces that reflect the pre- graded natural terrain
, or that simulates natural terrain (i.e. rounded, non-planer surfaces and rounded, non-angular intersections between surfaces).
Which method of contouring is most suitable for hilly terrain?
Cross Section method
This method is generally used for hilly terrain to produce contour lines.
What is the difference between direct method and indirect method of contouring?
Direct method- In direct method contour to be plotted is actually
traced
on the ground. … Indirect method- In this method, spot level is taken at the regular interval along predetermine line on the ground the work is then plotted on plan and then the required contour line is drawn by the process of interpolation.
What is Tacheometric method of 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.
What is contouring and its characteristics?
Contours show distinct characteristic features of the terrain as follows: i)
All points on a contour line are of the same elevation
. ii) No two contour lines can meet or cross each other except in the rare case of an overhanging vertical cliff or wall. iii) Closely spaced contour lines indicate steep slope.
What is the contour interval?
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. If the numbers associated with specific contour lines are increasing, the elevation of the terrain is also increasing.
When the distance is measured parallel to NS line is called as?
Which of the following statement is wrong? The distance measured parallel to the north-south line is called
latitude of the line
. The distance measured parallel to the east-west line is called departure of the line.
What represents a series of closely spaced contour lines?
A series of closely spaced contour lines represents a.
steep slope
.
What are 3 types of contour lines?
Contour lines are of three different kinds. They are
the Index lines, Intermediate lines and the Supplementary lines
.
What are the 5 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 basic features of contour lines?
- Must close on themselves, on or off the map.
- Perpendicular to the direction of max. …
- Slope between them is assumed uniform.
- The distance between them indicates the steepness of the slope, gentle or steep.
- Irregular signify rough, smooth signify gradual slopes.
