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The fundamental concepts of land surveying, including its definition, importance, and various types of surveys. It details the role of surveyors in land development and construction, from planning and design to the final construction of roads and utilities. The document also covers linear surveying methods, equipment such as tapes, chains, ranging rods, plumb bobs, marking arrows, and abney levels, and the principles of reconnaissance surveys, including well-conditioned triangles and referencing stations. It is a useful resource for students and professionals in civil engineering and related fields, providing a solid foundation in surveying techniques and equipment.
Typology: Lecture notes
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Lecture Notes Introduction Surveying is the process of determining the relative spatial position of points on or near the earth's surface. It is the art of calculating horizontal and vertical distances between objects, angles between lines, line orientation, and point establishment using predetermined angular and linear measurements. Surveying can also be defined as the act of making measurement of the relative position of natural and manmade features on earth’s surface and the presentation of this information either graphically or numerically. The Importance of Land Survey Land surveying is basically an art and science of mapping and measuring land. The entire scope of profession is wide; it actually boils down to calculate where the land boundaries are situated. This is very important as without this service, there would not have been railroads, skyscrapers could not have been erected and neither any individual could have put fences around their yards for not intruding others land. Types of Surveys Students to discuss types of surveying as their FIRST assignmet Uses of Surveys Surveyors play an integral role in land development , from the planning and design of land subdivisions through to the final construction of roads, utilities and landscaping. Surveyors are the first people on any construction site, measuring and mapping the land.
These primary measurements are then used by architects to understand and make the most of the unique landscape when designing and engineers to plan structures accurately and safely, ensuring buildings not only fit with the landscape but are able to be constructed. Linear Surveying Linear Measurements is the determination of the distance between two points on the surface of the earth is one of the basic operations of surveying. Measurement of horizontal distances or measuring linear measurement is required in chain surveying , traverse surveying and other types of surveying. Linear measurements in surveying can be performed by mainly three methods namely direct method , electromagnetic methods and optical methods. The direct method is the common method that employs a chain, tape or any other instrument to measure the linear distance. Equipment for Linear Measurements
1. TAPES – they include cloth tapes, Eslon tapes, Vinyl tapes, Steel tapes and Pocket rules. The steel tapes are made of steels and must be corrected Constant Errors. 2. CHAINS – The chain ( Fig.1 ) is made from steel wire links connected by small links. The total length of the chain is 20 m and is graduated throughout at 20 cm intervals with marks, called tallies at every 1 metre. As the chain is very strong, distances can be measured using it under bushy or rough ground. The graduates are not exact unlike the tapes. Therefore, the reading of the graduation is very rough.
Fig.2. Plumb bob pointing downwards.
5. Marking Arrows Arrows in surveying are the marking pins that are mostly used in chain surveying. They are used to mark the end of the chain length, if the length is to be measured using a chain and is more than the chain length. After each end of the chain length, the arrow is inserted in the ground. They are 4 mm in diameter and have a tensile of 700 N/mm^2 and their length varies between 250 – 500 mm (Fig 3). Fig 3. Marking Arrow/Pin
6. Abney level An Abney level is the most common type of clinometer for measuring angles that are inclined. The instrument consists of a fixed sighting tube, a movable spirit level that is connected to a pointing arm, and a protractor scale. An internal mirror allows the user to see the bubble in the level while sighting a distant target. Fig. 4. Abney level or Clinometer The Principles of Linear Surveying The purpose of linear surveying is to generate a map in a comparatively small area from the data obtained after field surveying. In linear surveying the following procedures are followed: 1. Reconnaisance Survey is carried out to search for the best sites for establishing survey stations in the area of concern. Therefore, the first task of a surveyor is to walk around in search for the best sites in the survey area. The sites must be carefully chosen using the following factors.