CLASSIFICATION OF SURVEYING

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Presentation transcript:

CLASSIFICATION OF SURVEYING Presentation by, Name : Dhaval Majithiya Mechanical Department Subject: Elements of Civil Engineering Subject code: 2110004 Roll no.: 204 Amiraj College of Engineering & Technology

Contents: Surveying- definition Why classification of surveying is needed? Classification of surveying- definition Parts of classification of surveying Classification based on instruments Classification based on methods Classification based on purposes Classification based on nature of field

Definition: Surveying

Surveying is an art and science of determining the relative positions of various points on the surface of the earth. By measuring the horizontal and vertical distances, angles and taking the details of these points and by preparing map or plants.

Definition: Classification of Surveying

Surveys can be simplified into various categories depending on the purposes, instruments, methods used and the nature of the field.

Why classification of surveying is important?

So apply these rules in surveying classification is important. There are some fundamental principals of surveying that.. Always work from the whole to the part, and To locate a new stations by at least two measurements from the fixed reference points.

Mainly 4 parts of classification: Classification based on methods Classification based on instruments Classification based on nature of field Classification based on purposes

Classification based on instruments: There are mainly 9 parts of classification based on instruments.

Chain survey: This is the simplest type of surveying in which only linear measurement are made with a chain or a tape. Angular measurements are not taken.

Compass survey In the compass survey, the angles are measured with the help of a magnetic compass.

Chain and compass survey: In this survey linear measurements are made with a chain or a tape and angular measurement with a compass.

Plane table survey: It is a graphical method of surveying in which field works and plotting both are done simultaneously.

Theodolite survey: In this survey, the horizontal angles are measured with a theodolite more precisely then compass and the linear measurement are made with a chain or a tape.

Tacheometry survey: A special type of theodolite known as a tacheometer is used to determine horizontal and vertical distances indirectly.

Levelling survey: This type of survey is used to determine the vertical distances and relative heights of points with the help of an instrument known as level.

Photogrammetric survey: Photogrammetry is the science of talking measurements with the help of photographs taken by aerial camera from the air craft.

EDM survey: In this type of survey, all measurements are made with the help of EDM instrument.

Classification based on methods: There are mainly 2 parts of classification cased on methods: Triangulation traversing

Triangulation: Triangulation is a basic method of surveying. When the area is very large then, triangulation is adopted. The entire are is divided into a network or triangles.

Traversing: A traverse is a circuit of survey lines. When the linear measurements are done with a chain and tape and the directions or horizontal angles are measured with a compass or theodolite respectively, the survey is called traversing. A traverse is a circuit of survey lines.

Classification based on purposes: There are mainly 4 types of classification based on purposes.

Geological survey: In this both the surfaces and subsurface surveying are conducted to locate different minerals and rocks. In addition, geological features of the terrain such as folds and faults are located.

Mine survey: Mine surveys include both the surfaces and underground surveys. It conducted for the exploration of mineral deposits and to guide tunneling and other operations associated with mining.

Archaeological survey: It is conducted to locate relics of antiquity, civilization, kingdoms, forts, temples, etc.

Military survey: It has a very important and critical application in the military. Aerial surveys are conducted for this purpose. It is conducted to locate strategic positions for the purpose of army operations.

Classification based on nature of field: There are mainly 3 parts of classification based on the nature of field.

Land survey: Land survey is done on land to prepare plans and maps of a given area. Topographical, city and cadastral surveys are some of the examples of land surveying.

Hydrographic survey: This survey is conducted on or near the body of water such as lake, river, coastal area. This survey consists of locating shore lines of water bodies.

Astronomic survey: The surveys are conducted for the determination of latitudes, longitudes, azimuths, local time, etc. for various places on the earth by observing heavenly bodies(the sun and stars).

Aerial survey: An aerial survey is conducted from aircraft. Aerial cameras take photographs on the surface of the earth in overlapping strips of land. This is also known as photographic survey.

Thank You!