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LEVELLING SURVEY SERVICES & TRAINING
 
 

 

LEVELLING LAND SURVEYING
 
  • Keywords : levelling survey, hills survey, hill survey, railway survey, new railway survey, Airborne lidar survey, Power transmission line, Route Planning , Line Construction, Optimization route,Catenary analysis, Identification of tower construction sites, Vegetation Enchoachment management, Change detection, As built survey..
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  • 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.
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    TYPES OF LEVEL
     
  • Dumpy level: Often a generic term for an optical level.
  • Tilting level: Replaced by the automatic level but useful where vibration is a problem.
  • Automatic level: Includes an internal pendulum which allows a horizontal reading.
  • Laser level.
  • Digital level: Staff read automatically.
  • Water level: Useful in confined spaces.
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    The Reticule diaphragm
     
  • The reticule, sometimes known as the cross-hairs or stadia hairs. The full horizontal line is the reference line for levelling and the 2 shorter lines above and below the full line are stadia lines for tacheometric measurements.
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    Reading staffs
     
  • Care should be taken of staffs as well as levels as they are prone to damage. They should be inspected regularly for signs of wear. A common error is misreading the staff, so it is important that time is taken to ensure accurate readings.
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    Holding the staff
     
  • A small spirit level should be attached.
  • Whilst standing upright the staff should be held in front with both hands down the side of the staff.
  • The staff should be ‘rocked’ back and forth, and the lowest reading recorded.
  • The verticality of the staff should be checked against a vertical line by standing to the side of the staff and checking it is aligned.
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    Booking observations
     
  • A new job should be started on a new page of the levelling book.
  • The details should be entered at the top of the page.
  • All observations should be booked legibly. If a mistake is made it should be crossed out and the correct value written above it instead of overwriting figures.
  • One line should be used for each position of the staff.
  • There should always be an entry made in the remarks column.
  • Work should be spread out appropriately
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    SURVEY SERVICES & TRAINING
     
  • Total Station
  • Topographical Survey
  • Property Survey
  • Setting Out Works Survey
  • Power Line Survey Survey
  • Railway survey
  • Hills survey
  • Minning survey
  • Road survey
  • Airport survey
  • Airforce NOC survey
  • UAV survey
  • Lidar survey
  • Pipeline survey
  • Power survey
  • Roperty survey
  • Geo Technical survey
  • Utility survey
  • Control Point survey
  • Route survey
  • Airport survey
  • Special survey
  • Contour survey
  • Levelling survey
  • Railway Project survey
  • Interior survey
  • Building survey
  • Road survey
  • Township survey
  • Drone survey
  • Drone Aerial survey
  • Drone survey
  • GBS survey
  • GPS Control Survey
  • Engineering survey
  • Transmission Line survey
  • Dam and Lake survey
  • Layout survey
  • Boundary survey
  • FMB Drawing survey
  • Canal survey
  • Marking survey
  • Layout Marking survey
  • Columns Marking survey
  • Excavation Points Marking survey
  • Pile Marking survey
  • Building Outer Lines Marking survey
  • Commercial
  • Residential
  • All Types of Construction Layout / Staking
  • ALTA / ACSM Surveys
  • As-Built-Record Surveys
  • Auction Surveys and Plats
  • Boundary Surveys
  • Control Surveys
  • Court Surveys / Professional Witness
  • Disputes
  • ividing and Platting of Land for City or County Planning Commissions
  • Flood Elevation Certificates
  • Foundation Surveys
  • Large Acreage Surveys
  • LOMA's / LOMR's
  • Metes and Bounds
  • Mortgage Surveys
  • Property Surveys for Fences, Pools, and Additions
  • Quantity Surveys
  • Stockpile Quantity Surveys
  • Subdivision Development
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    Types of land surveying List Methods
     
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