Contour Gradient, Field Location of Contour Gradient By Abney Level
Contour Gradient: During preliminary survey for roads during a hilly area, the specified points are first establish…
March 29, 2020
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Methods Generally Used or Indirect Method of Contouring, Arithmetical Method of Interpolation of Contour
In this method, the RLs of different points (spot levels) are taken at regular intervals along a series of lines n…
March 28, 2020
Direct Method of Contouring
Direct Method of Contouring: There may be two cases, as outlined below, Case I: When the area is oblong and cann…
March 28, 2020
Contour Line, Contour Interval, Horizontal Equivalent, Uses of Contour Map, Characteristics of Contour
Contour Line: The line of intersection of a level surface with the ground surface is known as the contour line or cont…
March 26, 2020
Source of Error and Their Elimination in Theodolite
A. Instrumental Errors The following are the major causes of instrumental error: Non-adjustment of Pla…
March 17, 2020
Method of Measurement of Deflection Angle and Magnetic Bearing
Method of Measurement of Deflection Angle: The deflection angle is that the angle by which a line is deflected f…
March 17, 2020
Method of Measuring Horizontal Angle and Vertical Angle by Theodolite
Method of Measuring Horizontal Angle: Suppose an angle AOB is to be measured. The following procedure is adopted:…
March 17, 2020
Temporary Adjustment of Theodolite
Tem porary adjustment of theodolite involves the subsequent steps. 1. Setting the Theodolite over the Station…
March 16, 2020
