What does RL mean in surveying?

What does RL mean in surveying?

Reduced level

What is positive RL and negative RL?

Levelling – measurement of geodetic height using an optical levelling instrument and a level staff or rod having a numbered scale. Reduced level (RL) – equating elevations of survey points with reference to a common assumed datum. The elevation is positive or negative according as point lies above or below datum.

How is RL measured?

Once you have taken all the levels you want, you will need to calculate the actual height values, or reduced levels (RL) by subtracting each one from the instrument height (IH). This gives you the ‘real’ height of the ground at the base of the staff.

What is RL in drawing?

RL (Reduced level) is any spot height that has been compared with another or datum using a level line or HOC. Reduced levels can be below the HOC or above the HOC. An RL is a comparative height when compared with a datum.

What do RL mean?

Real Life

What does RL stand for in school?

RL Education Abbreviation

2	RL	Read and Look Development, Study, Learning
2	RL	Reading Literary Grade, Standard, Reading
2	RL	Reflective Learner Learning, Skill, Technology
1	RL	Randall Library
1	RL	RAYMOND LIBRARY

How do you read RL Heights?

The difference between there staff reading indicates a rise fall according to the staff reading at the point. The R.L is then found adding the rise to, or subtracting the fall from the reduced level of preceding point. Sum of B.S. – sum of F. S. = sum of rise – sum of fall = last R. L. – first R.L.

How do you calculate RL level?

– method to calculate RL; height of collimation (H of C) = reduced level(R.L.) + backsight (B.S.) reduced level (R.L.) = height of collimation (H of C) – foresight (F.S.) reduced level (R.L.)

What is TBM level?

Temporary Bench Mark (TBM) – a point of known height above a pre-defined level. This level is not absolute and is defined locally by the surveyor for the purpose of the survey.

How do you take rl in a survey?

Procedure:

1. Set up the leveling instrument at Level position 1.
2. Hold the staff on the Datum (RL+50 m) and take a reading.
3. Move the staff to A and take a reading.
4. Move the staff to B and take a reading.
5. Move the staff to C and take a reading.
6. Move the staff to D and take a reading.

What is the use of RL fluid?

Ringer’s lactate solution (RL), also known as sodium lactate solution and Hartmann’s solution, is a mixture of sodium chloride, sodium lactate, potassium chloride, and calcium chloride in water. It is used for replacing fluids and electrolytes in those who have low blood volume or low blood pressure.

How do you calculate RL from Rise and Fall?

Rise and Fall Method is the method of calculating the difference in elevation between consecutive points in levelling work….Arithmetic check:

1. Last R.L – First R.L = 42.842 – 43.000 = -0.158 m.
2. ∑B.S – ∑F.S = 7.561 – 7.719 = -0.158 m.
3. ∑Rise – ∑Fall = 4.932 – 5.090 = -0.158 m.

How do you calculate RL by HI method?

Height of Instrument Method | Surveying and Levelling

1. Height of the Instrument Method.
2. Determine the RLs of various points if the reduced level (RL) of a point on which the first reading was taken is 136.440 gives the height of collimation method and applies the check.
3. HL = RL + BS.
4. Check.

What is Profile Levelling?

Profile levelling is the process of levelling along a fixed line to determine the elevations of the ground surface along the line. Profile levelling is also known as longitudinal sectioning. Use of profile levelling: The profile levelling is done to determine the undulations of the ground surface.

How do I find hi?

Using a straightforward rearrangement of one of the magnification equation forms, we can calculate the size of the image of an object on the camera film. Hi = – (Di * Ho)/Do = – (0.5 * Ho)/10 = – (1/20) * Ho. The image on the film will be 1/20 the size of the image it is photographing.

What is HI method in surveying?

Height of Instrument Method. In any particular set up of an instrument height of instrument, which is the elevation of the line of sight, is constant. The elevation of unknown points can be obtained by subtracting the staff readings at the desired points from the height of instrument.

What is the first principle of surveying?

What is the first principle of surveying? Explanation: The first principle of surveying is to work from whole to part.

What is height of instrument definition?

A surveying term used in spirit leveling for the height of the line of sight of a leveling instrument above the adopted datum, in trigonometric leveling for the height of the center of the theodolite above the ground or station mark, in stadia surveying for the height of the center of the telescope of the transit or …

What is height of instrument in survey?

[′hīt əv ′in·strə·mənt] (engineering) In survey leveling, the vertical height of the line of collimation of the instrument over the station above which it is centered, or above a specified datum level. In spirit leveling, the vertical distance from datum to line of sight of the instrument.

How do you use instrument height?

Height of the instrument = BM + BS = 100 + 5.5 = 105.5 ft. Distance between the instrument and the station D can be measured using meter tape or from the difference between upper & lower readings on the telescope.

What is height of collimation method?

Height of Collimation is the height of the horizontal plane through the telescope. The survey station is below the horizontal plane through the instrument, so to find reduced level, or ground height, take the staff reading away from Height of Collimation.

What is a backsight in surveying?

1 surveying : a reading of the leveling rod in its unchanged position when the leveling instrument has been taken to a new position.

What is foresight reading?

A foresight is a reading taken on a position of unknown coordinate(s). Since a survey progresses from a point of known position to points of unknown position, a foresight is a reading looking “forward” along the line of progress.

What is a meaning of survey?

The verb survey means to look something over. When you buy your first home, it’s a pleasure to stand on the porch and survey your property. Survey is also a verb. If you survey an area hit by an earthquake, you look closely at it to measure the damage.

What is backsight in Levelling?

A backsight (BS) is a sight taken with the level to a point X of known elevation E(X) , so that the height of the instrument HI can be found. A backsight in direct levelling is usually taken in a backward direction, but not always.

What are the two meanings of survey?

(Entry 1 of 2) transitive verb. 1a : to examine as to condition, situation, or value : appraise. b : to query (someone) in order to collect data for the analysis of some aspect of a group or area.

What is the purpose of survey?

Surveys are used to gather or gain knowledge in fields such as social research and demography. Survey research is often used to assess thoughts, opinions,,and feelings. Surveys can be specific and limited, or they can have more global, widespread goals.

What does Viewpoint mean?

point of view

What is another word for viewpoint?

SYNONYMS FOR viewpoint 2 standpoint, perspective, position, stance, angle.