Describe in brief errors in plane table survey.

Describe in brief errors in plane table survey.
by

1 Answer

Answer :

1) The board not being horizontal.

2) The table not being accurately centered.

3) The table not being Correctly oriented.

4) The objects not being sited accurately.

5) The alidade not being correctly centered on the station point on the paper.

6) The rays not being accurately drawn through the station point.

7) Inaccuracy in plotting.

8) The expansion and contraction of the paper.
by

Related questions

Describe in brief errors in compass survey.

Description : Describe in brief errors in compass survey.

Last Answer : Errors in Compass Surveying. The errors are classified as: 1. Instrumental errors. 2. Personal or Observational errors. 3. Errors due to External Influences (Natural errors etc.).  (1 ... in magnetic declination. (iii) Local attraction due to proximity of electric lines, steel structures etc.

Describe in brief resection method of plane table surveying.

Description : Describe in brief resection method of plane table surveying.

Last Answer : This method is used for establishing the instrument stations only. After fixing the stations, details are located either by radiation or intersection. The characteristic feature of resection is that the point ... of resection are (1)The Two Point Problem, and (2)Three Point Problem.

Describe in brief errors in levelling.

Description : Describe in brief errors in levelling. 

Last Answer : The sources of error in levelling are as below 1) Instrumental errors: Error due to imperfect adjustment, Sluggish bubble, Faulty Focusing tube, Erroneous leveling staff. 2) Personal errors: ... length. Use umbrella to shelter the instrument, use sun shade, avoid levelling work during wind. 

State advantages of plane table survey one each with respect to booking and suitability

Description : State advantages of plane table survey one each with respect to booking and suitability

Last Answer : Booking of observations: i) Field work and plotting work done simultaneously ii) ) Notes of measurement are seldom required and possibility of mistakes in booking is eliminated. Suitability of PT ... and work where great accuracy is not required. ii) Mostly suitable for survey in plain terrain

Explain the radiation method of plane table survey with neat sketch.

Description : Explain the radiation method of plane table survey with neat sketch. 

Last Answer : This method is used when all the points to be plotted are visible from single instrument station. Steps are: 1. Select a suitable point P on the ground such that all the details are visible from it. 2. Center and ... , pc, pd, pe respectively. Join a, b, c, d, and e to give the outline.

State merits and demerits of plane table survey.

Description : State merits and demerits of plane table survey. 

Last Answer : Merits: 1) It is the most rapid method of surveying.  2)There is no need for field book as plotting is done along with the field work, so the problem of mistakes in booking field notes does not arise. ... to carry. 5) The map cannot be replotted to defferent scale as there is no field book. 

State the principle of plane table survey.

Description : State the principle of plane table survey. 

Last Answer : Principle of plane table survey 1. The rays drawn from different points should pass through a single point i.e. position of station point.  2. The position of table should be same as that of previous station i.e. orientation should be done at each changed station.

State four advantages and four disadvantages of plane table survey

Description : State four advantages and four disadvantages of plane table survey

Last Answer : Advantages: 1. A field book is not required. 2. Errors of booking in field book avoided. 3. Errors of plotting can be readily checked. 4. Suitable in magnetic area. 5. Survey work with ... cannot be done in rainy season. 5. Difficult to re-plot as field notes are not available.

Explain temporary adjustment of plane table survey.

Description : Explain temporary adjustment of plane table survey.

Last Answer : 1. Setting over the station: The plane table is fixed on tripod and adjust the table in such a way that table is approximately level. 2. Leveling the table: The tubular or spirit level is placed in two ... . The table can be oriented in two ways. i. Using trough compass. ii. By back sighting.

List any four accessories required for plane table survey.

Description : List any four accessories required for plane table survey.

Last Answer : 1. Plane table. 2. Plumbing U-fork. 3. Alidade. 4. Spirit level. 5. Trough compass. 6. Plumb bob.

Enlist different accessories of plane table survey with their use.

Description : Enlist different accessories of plane table survey with their use. 

Last Answer : i) The plane table: It is used for fixing a drawing sheet over it.  To locate the position of the objects on the sheet by drawing rays and plotting to suitable scale. ii) The Alidade (plain Alidade ... v) U-Fork or Plumbing fork with plumb bob: It is used for centering the table over the station. 

State the suitability of plane table survey

Description : State the suitability of plane table survey

Last Answer : The plane tabling is generally suitable for surveys in which high precision is not required. It is mainly employed for small-scale or medium size mapping.

State any four sources of errors in compass survey

Description : State any four sources of errors in compass survey 

Last Answer : Following are the sources of errors in compass survey1. Instrumental survey-  a. Needle may not be perfectly straight and might not be balanced properly over the station.  b. Graduations of the rings ... substances near the station.  b. Magnetic field may vary on account of some natural causes. 

Explain errors occurred due to manipulation and sighting in plane tabling.

Description : Explain errors occurred due to manipulation and sighting in plane tabling.

Last Answer : i) The board not being horizontal- This error affects chiefly the measurement of vertical angles. ii) The table not being accurately centered. The plotted position of the occupied station not ... and correct any displacement. v) The defective sighting- The object not being correctly sighted.

What are the sources of errors in plane tabling?

Description : What are the sources of errors in plane tabling?

Last Answer : The following are the sources of errors in plane tabling 1) The board not being horizontal 2) The table not being accurately centered 3) The table not being Correctly oriented 4) The objects ... through the station point 7) Inaccuracy in plotting 8) The expansion and contraction of the paper 

Describe back sighting method of orientation of plane table surveying.

Description : Describe back sighting method of orientation of plane table surveying.

Last Answer : Backsight method of orientation 1. Assume we have to orient the table at next station B' represented on paper by point b'. 2.the line ba' is drawn on previous station A'. 3.the alidade is kept ... A'. 4. When the plotted line ab' coincides with line AB' and table will be oriented.

Differentiate between plane and geodetic survey on any four points.

Description : Differentiate between plane and geodetic survey on any four points. 

Last Answer : Difference between Plane Surveying and Geodetic Surveying Points Plane Surveying Geodetic Surveying Definition Plane surveying is that type of surveying in which mean surface of ... Traditional survey equipment is used Precise and modern survey equipment are required

Explain intersection method of plane survey.

Description : Explain intersection method of plane survey.

Last Answer : Intersection method of plane tabling 1. Lay out a base line AB and measure it and Plot a distance ab' on sheet using any scale. 2.Set up instrument at A' with a' over A' 3.Orient the table by ... sighted rays bd, bg, bf, bc are drawn to determine points intersection, d, g, f, c.

Describe instrumental errors in leveling.

Description : Describe instrumental errors in leveling.

Last Answer : The leveling process requires two instruments namely level and staff. The instrumental errors related to these are1. Error due to imperfect permanent adjustment: When the instrument is not in perfect ... the leveling staff may not be perfect. These errors can be neglected for ordinary work.

Describe in brief profile levelling.

Description : Describe in brief profile levelling.

Last Answer : The operation of taking levels along the center line of any alignment at regular interval is called longitudinal or profile levelling. Along the alignment, spots are marked at regular interval ... the points are plotted against their chainage to obtain ground profile along the alignment.

Describe in brief obstacles in chaining.

Description : Describe in brief obstacles in chaining.

Last Answer : There are 3 types of obstacles 1. Obstacle to ranging 2. Obstacle to chaining 3. Obstacle to both ranging & chaining. 1) Obstacle to Ranging: The type of obstacle in which the ... type of obstacle the problem lies in prolonging the line beyond the obstacle & determining the distance across it.

Describe in brief with neat sketch: i) Base line ii) Check line

Description : Describe in brief with neat sketch: i) Base line ii) Check line

Last Answer : i) Base line:  Base line is generally the longest line running roughly through the middle of the area. It is laid on a level ground as far as possible. The whole frame work is built upon this line. ... on the opposite side or a line joining some fixed point on any two sides of the triangle. 

Describe in brief process of chaining on sloping ground.

Description : Describe in brief process of chaining on sloping ground.

Last Answer : In direct method which is also known as stepping method horizontal distance is directly measured as shown in fig. Horizontal distance between A and B is required to be measured. Procedure: i) A ... iii) The next step start from the C and the method is continued till point B reached. 

Describe in brief primary classification of surveying

Description : Describe in brief primary classification of surveying

Last Answer : Primary Classification Geodetic Survey The geodetic surveying is that type of surveying which takes into account the curvature of earth's surface. It is generally adopted for large area (more than ... large scale such as Bridges, Dams, Location and Construction of canals, highways, railways etc.

State the situation where plane table is suitable.

Description : State the situation where plane table is suitable. 

Last Answer : 1) It is most suitable for preparing small scale maps 2) It is suitable in magnetic are where compass survey is not reliable 3) It is most suitable for filling in details between stations fixed by triangulation 4) It is suitable where accuracy is not required.

Draw sketch and explain method of traversing of plane table surveying.

Description : Draw sketch and explain method of traversing of plane table surveying. 

Last Answer : Procedure: 1.Set plane table over station A use plumbing fork for transferring station point from ground on sheet. Draw the direction of magnetic meridian with the help of compass. 2. With the ... scale Similarly, the table can be set at other successive station and traverse is completed.

Explain ‘Intersection Method’ of plane table surveying with neat sketch. Also give situation when intersection method is used.

Description : Explain ‘Intersection Method’ of plane table surveying with neat sketch. Also give situation when intersection method is used.

Last Answer : 1. Lay out a base line AB and measure it and Plot a distance ab' on sheet using any scale. 2.Set up instrument at A' with a' over A' 3.Orient the table by placing alidade ... the case of the survey of mountainous country. 5. The only linear measurement required is that of a base line.

Explain Orientation of plane table by Back-sighting Method.

Description : Explain Orientation of plane table by Back-sighting Method.

Last Answer : Ans:- The method of setting up the plane table at each of the successive stations parallel to the position it occupied at the starting station is known as an Orientation. Orientation must be done when ... and bisection of the ranging rod at a are perfect then orientation is said to perfect.  

State the use of alidade in plane table surveying

Description : State the use of alidade in plane table surveying

Last Answer : 1) It is used for sighting the objects to be located.  2) It is used for drawing the rays. 

What is orientation of plane table? State the procedure of any one method of orientation.

Description : What is orientation of plane table? State the procedure of any one method of orientation.

Last Answer : Orientation of plane table: It means placing table in parallel positions at all stations (or at successive station) 1. Orientation using trough compass: Here north direction is marked at first station ... rotated till ranging rod at previous station is exactly bisected. The table is then clamped. 

State the limitations of plane table surveying.

Description : State the limitations of plane table surveying.

Last Answer : 1) It is not suitable for work in wet climate 2) Several accessories are required to be carried hence possibility lost. 3) Replotting of survey work to different scale is difficult in absence of ... ) It is not intended for accurate work. 6) The plane table is essentially a tropical instrument.

Write errors in leveling and corresponding precaution

Description : Write errors in leveling and corresponding precaution

Last Answer : i) Instrument error with respect to bubble tube, leveling staff. 1.If bubble tube is sluggish it may apparently be in the center though the bubble line is not horizontal. Precaution - ... reading. Precaution- Leveling should be properly done by bringing the bubble of bubble tube at Centre.

Enlist different errors in compass surveying.

Description : Enlist different errors in compass surveying.

Last Answer : Various errors in compass surveying are classified asi) Instrumental errors. ii) Personal errors or observational errors iii) Errors caused due to external errors (natural errors) i) ... magnetic declination. c) Local attraction due to proximity of magnetic substances or magnetic field.

Explain in brief linear measurement using : i) Pacing ii) Digital Tape

Description : Explain in brief linear measurement using : i) Pacing ii) Digital Tape 

Last Answer : i) Pacing : This method is used only for knowing approximate distance between the objects. In preliminary survey this method can be used for linear measurement. This method consists of counting the ... and compact and measures accurate reading. The maximum measuring length of digital tape is 4.8m 

State different types of leveling. Explain any one in brief.

Description : State different types of leveling. Explain any one in brief.

Last Answer : Types of Levelling  1. Simple Levelling.  2. Differential Levelling.  3. Fly Levelling.  4. Longitudinal or profile leveling.  5. Cross-Section Levelling.  6. Check Levelling.  1. ... B are taken. The difference of these readings gives the difference of level between A and B. 

Explain in brief linear measurements using: {i) Chaining (ii) Digital Tape

Description : Explain in brief linear measurements using: {i) Chaining (ii) Digital Tape

Last Answer : i. Chaining:  a. Linear measurement with chain carried out by two chainmen-Leader and follower.  b. The follower keeps the chain handle at starting station point, holds firmly it and directs the ... is at right spot, press the button and tape measures, calculates and displays distance on screen.

Enlist method of ranging and explain any one in brief.

Description : Enlist method of ranging and explain any one in brief.

Last Answer : Ranging The method of establishing intermediate points on a straight line between the two fixed points is known as ranging. It is done before chaining started. It may be done by eye or by using some ... which are nearer to line AB. Repeat same process until points M and N are established.

What consideration would you have while selecting survey stations and survey lines in a chain survey?

Description : What consideration would you have while selecting survey stations and survey lines in a chain survey?

Last Answer : Following points to be considered while selecting survey stations and survey lines 1) Main survey station should be mutually visible. 2) All triangles should be well conditioned. 3) The survey line should lie ... of the area so as to form the frame work of triangles on it to cover maximum area. 

State the two uses of survey based on geodetic surveying

Description : State the two uses of survey based on geodetic surveying

Last Answer : Two uses of survey based on geodetic surveying:- i) To determine the precise position s on the surface of the earth. ii) Preparation of maps of large area like map of a country, state ... ) Establishment of GTS bench Marks across the country. iv) Preparation of military maps for defense purposes.

Defines the terms : i) Survey Station ii) Survey Line iii)Offset iv)Triangulation

Description : Defines the terms : i) Survey Station ii) Survey Line iii)Offset iv)Triangulation 

Last Answer : i) Survey Station : It is the point on ground from which various observations are taken around it. ii) Survey Line : It is the straight line joining two successive survey stations ... iv)Triangulation : The frame work consist of number of connected well conditional triangle is called Triangulation.

What are the objectives of following one each. i)Topographic Survey ii)Cadastral Survey iii)Engineering Survey iv)Mine Survey

Description : What are the objectives of following one each. i)Topographic Survey ii)Cadastral Survey iii)Engineering Survey iv)Mine Survey

Last Answer : i) Topographic Survey : To determine natural features like river, streams , lakes , hills etc and artificial features like roads , railways , canal , town and villages .  ii) Cadastral ... Mine Survey :To explore mineral deposits and to guide tunneling and other operations associated with mining. 

State any two uses of survey.

Description : State any two uses of survey.

Last Answer : Survey is useful for following: 1. To prepare a map or plan of the surveyed area for attaching it to legal documents. 2. To plot control points of boundries of locality 3. To determine ... . 5. To decide suitable gradient and camber of road depending on equal volume of cutting and filling.

Explain in detail classification of survey.

Description : Explain in detail classification of survey. 

Last Answer : A. primary classification-  1. Plane surveying: In this survey curvature of the earth is not taken in to consideration.  2. Geodetic surveying: In this survey curvature of the earth is taken ... 3. Based on nature of field:  1.Land surveying  2.Marine surveying  3.Astronomical surveying

State the uses of following instruments in survey: i)Cross staff ii) Chain iii) Pegs iv) Arrows

Description : State the uses of following instruments in survey: i)Cross staff ii) Chain iii) Pegs iv) Arrows

Last Answer : i) Cross-Staff: To set up perpendicular or right angle to given chain line OR to find foot of perpendicular from given object to a chain line. ii) Chain: Chains are used for measuring distances. iii) ... on survey lines. iv) Arrows : They are used to mark the end of each chain during chaining. 

State the classification of surveys based on i) The nature of the field of survey. ii) The object of survey.

Description : State the classification of surveys based on i) The nature of the field of survey. ii) The object of survey. 

Last Answer : i)The nature of the field of survey.  1.Land surveying.  2.Marine surveying or Hydrographic surveying.  3.Astronomical surveying.  ii) The object of survey. 1.Geological surveying. 2.Mine surveying. 3.Archaeological surveying. 4. Military surveying. 5. Engineeringsurveying.

Write the uses of following survey instruments i) Ranging Rod ii) Pegs iii) Cross-staff iv) Plumb bob

Description : Write the uses of following survey instruments i) Ranging Rod ii) Pegs iii) Cross-staff iv) Plumb bob

Last Answer : i) Ranging Rod : Ranging rod are used for ranging. ii) Pegs : Pegs are used for marking the positions of stations or terminals points of survey lines. iii) Cross-staff : It is used ... It is also used for accurate centering of the surveying instruments like theodolite, compass, plane table etc. 

State the different point to be considered in selection of survey station for a closed traverse

Description : State the different point to be considered in selection of survey station for a closed traverse 

Last Answer : 1) Main survey stations should be inter visible. 2) The main survey lines should form well-conditioned triangles. 3) Each triangle or portion of skeleton must be provided with sufficient check lines. ... ) Survey line must be as few as possible so that the frame work can be plotted conveniently.

State the situations under which chain survey is most suitable

Description : State the situations under which chain survey is most suitable

Last Answer : Situations under which chain survey is most suitable 1) It is suitable for moderately small areas 2) When the ground is fairly level with simple details ( free from obstructions such as trees, building, poles etc ) 

State two principles of survey.

Description : State two principles of survey.

Last Answer : Following are the two principles of survey. 1) To work from whole to part. 2) To locate a point at least by two independent processes.

Classify survey as per instruments used.

Description : Classify survey as per instruments used.

Last Answer : Classification of Survey as per Instruments. 1) Chain Survey 2) Compass Survey 3) Plane Table Survey 4) Theodolite Survey 5) Tachometric Survey 6) Photogrammetric Survey