Thatched roofs, usually sloping, were the earliest type and are still used in rural Africa and elsewhere. Flat roofs have historically been used in arid climates where drainage of water off the roof is not important. They came into more widespread use in the 19th century, when new waterproof roofing materials and the use of structural steel and concrete made them more practical. Sloping roofs come in many different varieties. The simplest is the lean-to (or shed) roof, which has only one slope. A roof with two slopes that form a triangle at each end is called a gable roof. A hipped (or hip) roof has sloping sides and ends meeting at inclined projecting angles called hips. The gambrel roof has two slopes on each of its two sides, the upper being less steep than the lower. The mansard roof has two slopes on all four sides, a shallower upper part and a steeper lower part.
Investigation or land surveying technology, professional, scientific and accurate point angle and the distance between them determines the position of the terrestrial or three-dimensional and generally authorized to practice by surveying the various members of the building profession. This point is common in the earth's surface, they are often the ownership, location (corner of underground features, surface location of the building) or other governmentally required or civil purposes (Real Estate sale) of land on the map and is used to set the boundaries.- Person's name