Plot the following cross-staff survey of a field and calculate its area in hectares. All distances noted in the field book are in metres solution : shows the plotting of field notes of the given area not to scale. The area Can be Found out in the Following manner. 1. Area of triangle AHB … Read more
Following figure shown a page in a field book of cross staff survey. Calculate the area enlarged between the stations: 1. Area of triangle AHD = 1 / 2 x 30 x 22.50 = 337.50 m² 2. Area of Trapezium HDFJ = ( 88.0-30.0) = ( 22.50+33.80/ 2 ) = 1632 . 70m² 3. … Read more
DESIGNATION OF MAGNETIC BEARING The magnetic bearings are designated in two systems, namely 1. Whole circle bearing (WCB) and 2. Quadrantal bearing (QB) 1. Whole Circle Bearing (WCB)Whole Circle Bearing (WCB) and Quadrantal Bearing (QB): The magnetic bearing of a line, with respect to the magnetic north measured in clockwise, established by the prismatic compass … Read more
COMPASS SURVEYING — Purpose, Principles, Field Procedure, Errors And Precautions In chain surveying the area to be surveyed is divided into connected triangles and only linear measurements are taken The chain surveying is suitable when the area to be surveyed is small and fairly flat. However, when the area to be surveyed is large, then … Read more
OBSTACLES IN CHAIN SURVEYING OBSTACLES IN CHAIN SURVEYING The objects, which create obstruction or difficulty in continuing the chaining of a survey line, are called obstacles. There are many obstacles which create obstruction to the chaining or ranging, they may be pond, Hill, river, valley, building etc. Various methods are adopted to overcome these … Read more