errors in chain surveying ppt

The line joining KG determines the direction of the chain line past the obstacle, and the obstructed length BK = AG-AB-GK = DA – AB – GK. Chain surveying is the branch of surveying in which only linear measurements are made in the field. All the surveying tools and surveying equipment should be selected in such that they are free from any errors. For chain surveying, at least two men are required, but frequently three people are employed. Guide to Compass Surveying | Open and Closed Traverse . T raverse in surveying is the series of connected survey lines whose distance is measured with the help of tape & chain and direction is measured with the help of compass or theodolite, from one point to another point in the field is called traverse in surveying.. TYPES of Traverse OPEN TRAVERSE. v A check can be made on both forward and backward bearings. Solve this simple math problem and enter the result. DISAVANTAGES OF PRISMATIC COMPASS SURVEY. surveying, the following strategies must be followed: Follow techniques that will help detect and eliminatealltheblunders. Surveying and Geomatics Topic Instructor: Prof. Ken Snelgrove Lect 7 - Sept 24/07 Slide 2 of 7 Taping Distance Errors Quantified Incorrect Tape Length Correction: (Section 6.14.1) Steel tapes may become damaged over time through “kinking”, “stetching” or through breakage and repair. No one considered redesigning the equipment or building in system This is most suitable adapted to small plane areas with very few details. of repetitions. Quick Check 3.9 Problem: Suppose you measure three numbers as follows: x = 200§2; y = 50§2; z = 40§2; where the three uncertainties are independent and random. Each link is a steel rod bent into a tight loop on each end and connected to the next link with a small steel ring. E.g. The chain survey is the simplest method of surveying. instrumental errors. This type of surveying is used over small and leveled areas. Reconnaissance: It is the preliminary inspection of the area to be surveyed. Teodolite Measurement and Errors; Measurement of Horizontal and Vertical Distance Simultaneously . 5.5 Land Surveying and Conventional Techniques for Measuring Positions on the Earth’s Surface. 18. 30838893 chain-survey 1. It derives its name from the fact that the If the surveying area is large, chain surveying is not adopted for surveying rather compass surveying is employed. In the chain survey, only measurements are taken in the field, and the rest work, such as plotting calculation, etc. Because systematic errors are repetitive and tend to accumulate in a series of measurements, they are also referred to as cumulative errors. Obstacles to Chaining In this type the ends of lines are visible but chaining is obstructed. 3. The idea of working this way is to prevent the accumulation of errors and to control and localize minor errors which, otherwise, would expand to greater magnitudes if the reverse process is followed, thus making the work uncontrolled at the end. Plane Table Surveying: In plane table surveying, the fieldwork and plotting are done using a graphical method. THEODOLITE SURVEYING MEASUREMENT OF HORIZONTAL ANGLES: ii) Repetition Method. What are the different sources of errors in chain surveying? Eliminate or correct all systematic errors by frequent calibration and adjustment of the instruments Minimize the random errors by using good instrumentsandfieldprocedures. v It requires high knowledge. 2) Station Marking. INTRODUCTION: Overview of plane surveying (chain, compass and plane table), Objectives, Principles, and classifications. It is composed of 100 links, with a link being 0.66 feet or 7.92 inches long. (i) To start the chaining of a line the follower holds the zero end of the chain in contact with the peg at the beginning of the line and presses the handle with his feet and stands firmly over it. Chain Surveying: Chain surveying is the simplest method of surveying in which the linear measurements are directly taken in the field and the angular measurements are not taken. In chain surveying, the positions of main stations and directions of main survey … Although … Ease, accuracy, and worldwide availability have made ‘GPS’ a household term. If carefully done, it gives quite accurate results. The end of each link are bent into a loop and connected together by means of three oval rings. v All readings can be made quickly and easily. Traverse in Surveying. The station can be mark when the station criteria had been full fill. Linear measurements refer to horizontal distances measured by chain or tape. Yet, none of the power or capabilities of GPS would have been possible without traditional surveyors paving the way. The length of chain is measured from one handle to other handle. Types of Surveying . The chain is composed of 100 or 150 pieces of galvanized mild steel wire called links, joined together with oval rings and handles at both ends. In this method ,the same angle is added several times mechanically and the correct value of the angle is obtained by dividing the accumulated reading by the no. Taking Offsets. are done in the office. chaining, Ranging, Chaining on uneven slopping ground, Errors in Chaining, Corrections. Numerical Examples for Chain Surveying | Errors in Surveying. Not correcting for these effects gives rise to systematic errors, i.e. Running survey lines. If the plot for surveying has numerous obstacles and undulations which prevents chaining. Under the same measurement conditions, these errors will have the same magnitude and direction (positive or negative). In surveying, tape correction(s) refer(s) to correcting measurements for the effect of slope angle, expansion or contraction due to temperature, and the tape's sag, which varies with the applied tension. same errors, and the addition in quadrature rule requires that the various errors be independent. are done in the office. effects which act in a predictable manner and therefore can be corrected by mathematical methods. Angular measurements refer to the magnetic bearing or horizontal angle taken by a prismatic compass or theodolite. This is suitable for the survey of small areas with simple details and an area that is fairly flat. v It requires areas with no magnetic materials. (i). Surveying Primary divisions of surveying: 1. Forgetting once chain length; Making mistakes in using a calculator; Accidental Errors: Surveying errors can occur due to unavoidable circumstances like variations in atmospheric conditions which are entirely beyond the control of the observer. Survey data is portrayed graphically by the construction of maps, profiles, cross sections, and diagrams. or any other measurements are done these possible sources of errors should be highly considered for an accurate measurement. In this survey only measurements are taken in the field, and the rest work, such as plotting calculation etc. o A B HORIZONTAL ANGLE AOB 30. Various geometric properties may be used to find obstructed length CB as shown in Fig. UNIT – II: DISTANCES AND DIRECTION: Distance measurement conventions and methods; use of chain and tape, Electronic distance measurements, Meridians, Azimuths and Bearings, declination, computation of angle. If carefully done, it gives quite accurate results. Or what are the steps involved in chain survey? no angular measurements are made. Chain Surveying – Chain triangulation, Survey stn., lines, locating ground features, field work, instruments for setting out basic problems in chaining, obstacles in chaining Module –II (10 Hrs) 4. Examples of such obstructions are ponds, lakes, marshy land etc. Instrumental errors: incorrect length of the chain (Cumulative Errors). Eden. • Factors Which Influence the Use of Chains • Measured distances are limited to the length of the chain, usually 50 or 100 meters. Systematic errors are caused by the surveying equipment, observation methods, and certain environmental factors. Use step-by-step propagation to find the quantity q = x=(y ¡ z) with its uncertainty. This method is used for very accurate work. This is most suitably adapted to small plane areas with very few details. This was the only means through which directions and the horizontal … 10/5/01 6. Reply. October 5, 2018 at 6:41 pm that is very good but you need to put a lot of information on the whole topic that will be adequate for the reader. When any surveying such as land survey, topographical survey, building survey, structural survey, boundary survey, property survey etc. These surveys are of high precision and extend over large areas. They are: (1) The surveyor, who does the reading and booking, (2) The leader, and (3) The follower. v It can be combined with other methods like chain survey nd plane table survey. v It reduce errors than chain survey. Compass surveying can be defined as the method of surveying in which the directions of the survey lines is determined by means of a compass and also by using tape or a chain. The common station marking are wood peg and nails. v It requires areas with no ferrous materials. WHITE PAPER | PHARMA BIOTECH The nurse was fired due to gross negligence, but the systems were not re-evaluated. 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