Basic Land Surveying Course Central Area, Central

Course details

The course covers levelling and total station instrument use and adjustment, misclose distribution, Angle-Bearing-Angle conversion and revision of trigonometry concepts. Introduction to coordinates and explanation of the common survey computations for close and area are also covered.

Candidates are given practical project work, e.g. closed traverse, series levelling loop and are assessed on both the conduct and results of their work

The syllabus and structure are subject to revision without prior notice to reflect current changes in technique or technology.

Introduction to Land Surveying

Introduction

• What is land surveying? Explain Plane & Geodetic Surveying. Field & Office Work. Use of surveying for boundary definition, for construction, horizontal control & vertical control.
• Engineering, cadastral, hydrographic & photogrammetric Surveys.

Principles of Surveying

Concept of poiint location by:

• Trilateration
• Offsets
• Traversing
• Intersection

The Surveyor’ Work

• Verify/establish horizontal & vertical controls
• Location/ refixing the positions of boundary marks in a cadastral survey
• Carry out a topographical survey
• Horizontal & Vertical monitoring of structures, dams, tunnels etc
• Carry out a pre-computation for a setting out survey
• Setting out building corners, roads, drains etc

Equipment

• Measurement of distance: tapes, chains, edmi
• Measurement of angles/bearings: theodoites, total stations, robotic system
• Measurement of N,E,Z coordinates: GPS, Total station

Field Procudure

• Working from whole to part
• Recce
• Planning & obtaining datum for survey
• Observation & recording

Horizontal Control Survey

Establishing horizontal controls using total station &./ or GPS

• Controls for setting out/traverses
• Concept of true north, grid north, bearings, angles etc
• Linear measurement with tapes, chains, edmi
• Accuracies & errors in linear measurements
• Method of measuring angles, bearing & their associated errors & accuracies

Traverses

• Open & close traverses
• Datum to commence survey
• Cadastral survey traverse & connection to ISN marks

Computations

• Linear Misclose
• Precision & Accuracy
• Adjustments: Bowditch Rule, Transit Rule & Least Square
• Calculate setting out data
• Calculate area & volumes
• Calculate clearances, distance, angles, coordinates

Vertical Control Survey

Ordinary levelling:

• Basic knowledge & Equipment
• Principle of finding
• Booking, calculations & checks
• Accuracy, precision & errors
• Adjustments

Perrmanent adjustment

Applications of levelling:

• Long & cross sections
• Contouring
• Setting out proposed levels
• Monitoring of settlement markers

ENTRY REQUIREMENTS

• Minimum of 1 GCE “O” Level credit; OR
• 3 GCE “N” Level; OR
• NITEC