Using virtual work (unit load) method, determine the vertical displacement at Joint D of the steel truss as shown in the following figure due to applied load P kN at D and member BC is too long by 8 mm & member AB is too short by 5 mm. The cross-sectional area of each member is 400 mm² and the modulus of elasticity is 200 GPa. P kN V D 6 m А B 5m 5m

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Coordinate Geometry of Survey

Coordinate geometry (COGO) is a method of inserting surveying or engineering data into geographic information system (GIS), computer-aided design (CAD), or mapping software. These data can be collected on the proposed construction site using standard surveying techniques and instrumentation or may be taken from existing maps, engineering plans, drawings, or records. Data gathered on the site includes coordinates of points, bearings, and distances between points. The data are noticed and noted through conventional surveying procedures, like a traverse or layout measurement series and it can be either digital or non-digital. The maps and plans are inclusive of boundaries, divisions, and other components, and these features are shown with coordinate values, the lengths, offset distance, and bearings between them.