Question: What Does FS Mean In Surveying?

What is datum in surveying?

Datums are the basis for all geodetic survey work.

A geodetic datum is an abstract coordinate system with a reference surface (such as sea level) that serves to provide known locations to begin surveys and create maps.

One application of the horizontal datum is monitoring the movement of the Earth’s crust..

What is the difference between backsight and foresight?

As nouns the difference between backsight and foresight is that backsight is the rear sight of a firearm while foresight is the ability to foresee or prepare wisely for the future.

What is Rise and Fall method?

Rise and Fall Method: It consists of determining the difference of elevation between consecutive points by comparing each point after the first that immediately preceding it. The R.L is then found adding the rise to, or subtracting the fall from the reduced level of preceding point. …

What are the main objectives of surveying?

Objectives of SurveyingTo determine the relative position of any objects or points of the earth.To determine the distance and angle between different objects.To prepare a map or plan to represent an area on a horizontal plan.To develop methods through the knowledge of modern science and the technology and use them in the field.More items…

What is the height of instrument?

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.

What is BS and FS in surveying?

h) Back sight : (B.S.) – The first sight taken on a levelling staff held at a point of known elevation. B.S. enables the surveyor to obtain HI +sight i.e. Height of Instrument or line of sight. i) Fore Sight : (F.S.) – It is the last staff reading taken from a setting of the level. It is also termed as minus sight.

What is the meaning of surveying?

Surveying or land surveying is the technique, profession, art and science of determining the terrestrial or three-dimensional positions of points and the distances and angles between them. … Surveying has been an element in the development of the human environment since the beginning of recorded history.

What is a backsight in surveying?

Back sight (BS) – short for “back sight reading”, the first staff reading taken by the surveyor after the levelling instrument is set up and levelled. B.S is generally taken on the point of known reduced level as on the benchmark or a change point.

What is a backsight?

1 surveying : a reading of the leveling rod in its unchanged position when the leveling instrument has been taken to a new position. 2 surveying : a sight directed backward to a previous station.

What is the purpose of Levelling in surveying?

Levelling is a process of determining the height of one level relative to another. It is used in surveying to establish the elevation of a point relative to a datum, or to establish a point at a given elevation relative to a datum.

What are the uses of surveying?

Uses of SurveyingTopographical maps showing hills, rivers, towns, villages, forests etc. … For planning and estimating new engineering projects like water supply and irrigation schemes, mines, railroads, bridges, transmission lines, buildings etc.More items…

How do you calculate hi?

Measure a backsight on A (for example, BS = 1.89 m). Measure on C a foresight FS = 0.72 m. Calculate HI = BS + E(A) = 1.89 m + 100 m = 101.89 m. Find the elevation of turning point C as E(C ) = HI-FS = 101.89 m – 0.72 m = 101.17 m.

What is backsight and foresight in surveying?

It is important for you to understand exactly what “backsight” and “foresight” are in direct levelling. 2. 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.

What is intermediate sight in surveying?

Intermediate Sight. An intermediate sight (I.S) is any staff reading taken on the point of unknown elevation after the back sight and before the fore sight. This is necessary when more than two staff readings are taken from the same position of the instrument.

What is the principle of survey?

Surveying is the process of finding the relative position of various points on the surface of the earth by measuring distance among them and setting up a map to any reasonable scale. Various methods of surveying are established on very simple fundamental principles.

What is the first principle of surveying?

GENERAL PRINCIPLE OF SURVEYING According to the first principle, the whole area is first enclosed by main stations (i.e. controlling stations) and main survey lines (i.e. controlling lines). The area is then divided into a number of parts by forming well conditioned triangles.

What are the two principle of surveying?

There are two basic principles upon which various methods of plane surveying are based. 1) LOCATION OF A POINT BY MEASUREMENT FROM TWO POINTS OF REFERENCE: The relative positions of the points to be surveyed should be located by taking measurement from at least two points of reference.

What are the types of surveying?

The core disciplines of surveying are:Land surveying (also known as Cadastral Surveying) … Engineering surveying. … Mining surveying. … Hydrographic (Bathymetric) surveying. … Geodetic surveying. … Aerial (Photogrammetry and remote sensing) … Topographic (Detail/Tachymetry) … Notes.

What is another word for surveying?

Surveying Synonyms – WordHippo Thesaurus….What is another word for surveying?examiningscanningbeholdingcheckingconsideringoverlookingoverseeingperusingappraisingauditing224 more rows