The other group of surveys offered by Ground Force are those related to civil engineering or construction works. This includes topographical surveys, earthworks and setting out. Topographic surveys are maps showing the slope of land using contours. Contours are lines joining points of a similar height. This type of survey is used by civil engineers in design work. Ground Force offers a complete array of construction lay-out services, including the layout of roads, railways, power-lines, pipe-lines, buildings, storm and sewer drainage systems etc.