Plane table surveying involves simultaneously conducting fieldwork and plotting on a drawing board. It is well-suited for small mapping projects and adding detail to existing maps. Key equipment includes a plane table, alidade, spirit level, and accessories for orientation like a compass. Common surveying methods are radiation, intersection, traversing, and resection. Benefits include direct plotting in the field and checking accuracy, while drawbacks are unsuitability for large or precise projects.
These slides deal with the techniques and methods of the plain table survey. Graphical method of surveying in which the fieldwork and plotting are done simultaneously.
These slides deal with the techniques and methods of the plain table survey. Graphical method of surveying in which the fieldwork and plotting are done simultaneously.
Plane table surveying is a convenient method to recognize the field or plot . It is generally used in the small area or plots where you can fill interior details . It is a graphical method of surveying
.The main principle of plane tabling is parallelism, in this method we have a sheet on the board when the rays or lines drawn on the sheet are parallel to the field .
Plane Table Surveying is a graphical method of survey in which the field observations and plotting are done simultaneously.
It is simple and cheaper than theodolite survey. It is most suitable for small scale maps.
The plan is drawn by the surveyor in the field, while the area to be surveyed is before his eyes. Therefore, there is no possibility of omitting the necessary measurements.
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Plane table surveying is a convenient method to recognize the field or plot . It is generally used in the small area or plots where you can fill interior details . It is a graphical method of surveying
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Plane Table Surveying is a graphical method of survey in which the field observations and plotting are done simultaneously.
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The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
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2. Plane Table Surveying
- Plane table is a graphical methodof surveying in which
the field work and the plotting is done simultaneously.
- It is adopted in small mapping.
- It is also ideally suited to filling detail on a map already
prepare and available on the drawing sheets.
- It can also be used to prepare a fresh map with the
linear measurements being taken with a chain or tape.
4. Plane Table And Tripod
A simple plane table is a drawing board provided with
a ball and socket arrangement for leveling the table
,with an arrangement to fix the table to a tripod.
5.
6. Alidade
- a plane alidade consists of a metallic rule with a fine
beveled edge called the fiduucial edge.
- This edge used for drawing line.
- For sighting-by placing the ruling edge along the points or
lines marked on the sheet.
- Two frame are attached vertically at its end.
- The eye vane-a small metal frame with a silt.
- The object vane-a frame with a fine hair placed vertically
,for bisecting – the part directed towards the object.
- The center of the eye vane and hair of the object vane
provides the line of site.
9. Telescopic Alidade
The alidade which is fitted with a telescope is known
as a telescopic alidade.
It is used to take inclined sights.
It increases the range and accuracy of the sights.
It consists of a small telescope with a level tube.
A graduated scale is mounted on the horizontal axis.
One side of the metal ruler is used as the working edge
along which lines are drawn.
The angles of elevation or depression can be read on
the vertical circle.
10.
11. Spirit Level
Spirit level can be used to level the plane table.
It can be tubular level which can be placed in two
perpendicular positions and leveled.
12.
13.
14. Trough Compass
A compass is used for orienting the plane table when it
has to be used in more than one station.
When the table is shifted to another station ,the
compass is placed along the meridian previously
drawn and the table is rotated to make the needle read
zero.
The table is then oriented to the same position it
occupied at the previous station.
15.
16. Plumbing fork
The plumb bob is fitted on to a folded frame (fork).
The straight edge can be placed on the table and the
bottom leg on the frame is under the table.
The top leg has a fine point which can be kept on a
plotted point.
18. Plane Tabling Methods
The plane table can be used in four ways-
i) radiation
ii) intersection
iii) traversing
iv) resection
Plane table is generally used with the traverse drawn
on a sheet for filling details or
Can also be used for doing a fresh survey.
These methods cover both these aspects of surveying
with the plane table.
19. Radiation Method
It requires the plane table to occupy a single station .
Orientation table is not required.
To conduct the survey of an area ,the table is kept at a
convenient station P commanding a full view of the
area to be surveyed.
20.
21. Intersection Method
This method requires setting the table up at minimum
of two stations.
Orientation is essential and be can done by back
sighting.
Two station A and B are selected so that they
command a full view of the area to be surveyed.
22.
23. Traversing Method
This method is used to connect the two or more
stations , however it is similar to the compass
traversing but are done simultaneously.
Traversing is a method of surveying where by a series
of lines are surveyed.
Traverse may be open or closed one.
24.
25. Re-Section Method
This is the method of orienting the table . a
characteristic feature of resection is that the objective
is to plot the station occupied by the table on the sheet
rather than obtaining the other stations or plotting
details.
Two method of orienting the table
Method of back sighting
Method using trough compass
26.
27. Two-Point Problem
This is a special case of resection to obtain the position
of station occupied by the table ,given the plotted
position of the two points.
State – to determine the position s of the station S
occupied by the plane table, given the accurately
plotted position ,p and q of the two points P and Q
visible from the instrument station without occupying
these two stations.
28. Three-Point Problem
This is also a problem of resection.
Objective is to obtain the position of the occupied the
table after orientation.
State – given three visible stations and their plotted
positions, to plot the station occupied by the plane
table with the table correctly oriented with respect to
the three points already plotted.
29. Advantage Of Plane Table
Surveying
It is suitable for location of details as well as contouring for large scale
maps directly in the field.
As surveying and plotting are done simultaneously in the field, chances
of getting omission of any detail get less.
The plotting details can immediately get compared with the actual
objects present in the field. Thus errors as well as accuracy of the plot
can be ascertained as the work progresses in the field.
Contours and specific features can be represented and checked
conveniently as the whole area is in view at the time of plotting.
Only relevant details are located because the map is drawn as the
survey progresses. Irrelevant details get omitted in the field itself.
The plane table survey is generally more rapid and less costly than most
other types of survey.
As the instruments used are simple, not much skill for operation of
instruments is required. This method of survey requires no field book.
30. Disadvantage Of Plane Table
Surveying
The plane table survey is not possible in unfavourable
climates such as rain, fog etc.
This method of survey is not very accurate and thus
unsuitable for large scale or precise work.
As no field book is maintained, plotting at different scale
require full exercise.
The method requires large amount of time to be spent in
the field.
Quality of the final map depends largely on the drafting
capability of the surveyor.
This method is effective in relatively open country where
stations can be sighted easily .
