 PREPARED BY: 1.Sindha.Rinku.R 2.Trivedi.Hasti 3.Kamdar.Karan  GUIDANCE BY : ASHISH RATHOD (ASST.PROF.) Modern tools of Surveying & Mapping.

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Presentation transcript:

 PREPARED BY: 1.Sindha.Rinku.R 2.Trivedi.Hasti 3.Kamdar.Karan  GUIDANCE BY : ASHISH RATHOD (ASST.PROF.) Modern tools of Surveying & Mapping

MODERN SURVEYING

EDM – Electronic distance measurement equipment. Auto level. Digital level. Total station. GPS – global positioning system.

Now separate EDM are not very popular, instead Total Station which have in built EDM is being used. Measurement of distance is accomplished with a modulated microwave or infrared carrier signal, generated by a small solid-state emitter within the instrument's optical path, and bounced off of the object to be measured. The modulation pattern in the returning signal is read and interpreted by the onboard computer in the EDM. The distance is determined by emitting and receiving multiple frequencies, and determining the integer number of wavelengths to the target for each frequency.microwaveinfraredwavelengthsfrequency

* Most total stations use a purpose-built glass Porro prism as the reflector for the EDM signal, and can measure distances out to a few kilometers, but some instruments are "reflectorless", and can measure distances to any object that is reasonably light in color, out to a few hundred meters. The typical Total Station EDM can measure distances accurate to about 3 millimeters or 1/100th of a foot.Porro prism

Very handy, Cheap, Can be used with accuracy of 10mm or so, Useful for remote measurem ents like contact wire etc., Handy geodimeter

Early age levels are oDoDumpy levels. oToTilting levels. Early age levels

Now most commonly used levelling instruments are - Auto level. o Auto level, as name sounds it has a auto level compensator and corrects automatically if instrument goes out of level within it’s range. Auto level

With auto level:- oSoSurvey work can be done fast, oLoLess chances of error, oMoMagnification available is more, oRoRange is more, oIoImage is erect so less chances of error.

They are not popular instead auto levels are more extensively used. The Trimble DiNi Digital Level : Determine accurate height information 60% faster than with automatic leveling. Eliminate errors and reduce rework with digital readings. Transfer data to the office easily. Digital level

BASIC PRINCIPAL total station integrates the functions of a theodolite for measuring angles, an EDM for measuring distances, digital data and a data recorder. Examples of total stations are the Sokkia Set4C and the Geodimeter 400 series. All total stations have similar constructional features regardless of their age or level of technology, and all perform basically the same functions. Total station

Total solution for surveying work. Most accurate and user friendly. Gives position of a point (x, y and z) w. r. t. known point (base point). EDM is fitted inside the telescope. Digital display. Features of Total station

On board memory to store data. Compatibility with computers. Measures distance and angles and displays coordinates. Auto level compensator is available. Can work in lesser visibility also. Can measure distances even without prismatic target for lesser distances. Is water proof. On board software are available. Can be used for curve layout after feeding data.

New total stations have atmospheric correction, and auto-focus. In addition, these series incorporates a quick distance measuring mode and a high data storage capacity for increased productivity. The new Total station gives the unique opportunity for long range distance monitoring of up to 9000m to a single prism. Using the scan functionality of software allows fully automated monitoring of the prism in direction of the line of sight.

 G General purpose angle measurement  General purpose distance measurement  Provision of control surveys  Contour and detail mapping  Setting out and construction work Uses of total station

 A A clear line of sight between the instrument and the measured points is essential.  The precision of the instrument is dependent on the raw repeatabilities of the direction and distance measurements.  A well defined measurement point or target/prism is required to obtain optimal precision and accuracy.  The accuracy of direction and distance measurement is subject to a number of instrumental errors and the correct field procedures. Factors influencing use of total station

TTargets or Prisms to accurately define the target point of a direction measurement.  A data recorder if one is not integrated into the total station.  A download cable and software on a PC to capture and process the captured digital data to produce contour and detail maps. Auxillary equipment required :

oDoDisplay at target also, oNoNo need of operator on station, oMoMoves automatically to predetermined direction and focuses automatically at target at specified distance, oCoCan be integrated with GPS also. Robotic Total station

Thank you