In this type of surveying plotting of the plan and field observations can be done simultaneously. This can be achieved by many methods as follows.In tracing method, plane table is located at a point from where three points are visible. Please enter your email address. Then alidade is placed over a and sight station A, then line Aa cuts the line bx at somewhere which is located as point c at station C.In this case, an auxiliary point D is considered nearer to C. Locate the plane table at D according to the line ab parallel to AB. and perform the whole from that point. "Resection (surveying)" redirects here.

From point O, sight the points A,B,C,D and E using alidade, locate and plot the points as a,b,c,d and e in the drawing sheet.In this method we can locate the point by plotting two rays from two known stations. Accuracy increases as the angle between the two position lines approaches 90 degrees.Resection continues to be employed in land and inshore navigation today, as it is a simple and quick method requiring only an inexpensive magnetic compass and map/chart.

DIFFERENT METHODS OF SURVEYING M. Seedat, S. Thusi, M.Zaca, L. Mnembe, N. Ndaba – Survey and Land Information Dept.

It is not to be confused with Glossary of the Mapping Sciences, American Society of Civil Engineers, page 451.

VIP members get additional benefits.Login to The Constructor to ask questions, answer people’s questions, write articles & connect with other people. Plane table is placed at apposition from where all the three points are visible. The rays form small triangle which is called triangle of error. Repeat this procedure until error becomes zero.There are many analytical methods are developed in three-point problem condition. Radiation 2. Compass Surveying . In this case theheights of the first control point A and those of the closing point C are entered intothe total station together with each instrument and reflector height as individualmeasurements are taken.Some traverse programs allow the user to fix the positions of additional pointsalong the traverse called side shots. Now set the table on P and make it centered and level. In case of plane table surveying Geometrical conditions of site are manuscript in the map sheet using plane table and alidade after that topographic details are arranged on the map.General equipment used for conducting plane table survey areFix the plane table to the tripod stand. Finally traverse lines are plotted on the drawing sheet.Resection is a method of plane table surveying in which location of plane table is unknown and it is determined by sighting it to known points or plotted points.

6.5. It is obviouslynot possible to set up an instrument at these but it is possible to obtain theircoordinates by using intersection.Since they are usually in elevated positions they can be seen when the lines ofsight to other control points at ground level become obscured as constructionproceeds.A and B are points in a control network with known coordinates (EA , NA) and (EB ,NB).
Intersection by baseline . 2 • Surveying has to do with the determination of the relative spatial location of points on or near the surface of the earth. It is preferred when the distance between the stations is too large, or the station’s arc inaccessible, or the ground is undulating. Only one linear measurement is required as in the intersection method of plane tabling. VIP members get additional benefits.Lost your password?

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