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Showing posts from October 13, 2018

SURVEY

By definition, s urveying is the science of gathering, determining, recording and measuring the relative size of human made and natural features on the earth`s surface. Surveying is the science of measuring and record distances, angles and heights on the Earth’s surface to obtain data from which accurate plans and maps are made. Surveying is also the art and science of making or taking measurements both linear and angular on the earth’s surface at different positions for the purpose of producing a plan or map. In other definition; surveying (land surveying) is a science of measuring and recording distances, angles and height on earth’s surface to obtain data by which accurate plans and maps of parts of surface of the earth are made Angular measurement means measuring the distance from a given reference point to an observed object. The distance is measured in a clockwise direction from North. Linear measurement is the distance measured along the surface of the gr...

DEFINITION OF TERMS

Absolute Humidity: it is the vapour concentration or vapour density   Adiabatic lapse rate: the lapse rate which occurs when the temperature changes without addition or substitution of energy. Aerosols: these are particulate matters. Air mass: the large body or volume of air with uniform characteristics of temperature and humidity moving or covering a large area and moving along a considerable long distance. Albedo: the ratio between incoming radiation and the amount reflected back into space expressed in percentage.     Altitude: the height of the ground measured from the mean sea level. Anemometer: a tool measuring velocity or speed of wind. Angle of incidence: The angle which rays from the sun strikes the earth’s surface. Anticyclones: Are reverse of depression whereby air circulates away from the centre in a clockwise motion in the northern hemisphere and anti-clockwise in the southern hemisphere. Aspect: the direction of to which a s...