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Coordinate Systems And The Consequences That Mistakes Can Have On Projects A construction project’s success factor begins with accurate survey data and the coordinate system it is based on. The coordinate system is the source for obtaining the precise survey data. Coordinates are necessary when laying projects out, whether it’s a highway, bridge, site work, utilities, or another type of construction project. A coordinate system is a method for identifying the location of a point on Earth. Even though Earth is spherical, the assumption is that the area is flat because coordinate systems are based on a plane (2D). Unfortunately, even one wrong number in a coordinate system will throw off an entire project. Therefore, surveyors need to be well-versed in coordinate geometry to do their job well and share accurate information with project managers and engineers. Commonly, local systems are created and used on a project-by-project basis.