Writing, developed first by people in Sumer, is considered a hallmark of civilization and appears to accompany the rise of complex administrative bureaucracies or the conquest state. Traders and bureaucrats relied on writing to keep accurate records.
Elevation, or geometric height, is mainly used when referring to points on the Earth 's surface, while altitude or geopotential height is used for points above the surface, such as an aircraft in flight or a spacecraft in orbit, and depth is used for points below the surface. topographical map is the main type of map used to depict elevation, often through use of contour lines. In a Geographic Information System (GIS), digital elevation models (DEM) are commonly used to represent the surface (topography) of a place, through a raster (grid) dataset of elevations.
Interior Elevations are like sections in that they show all of the heights inside the house. The difference between Interior Elevations and Sections is that Interior Elevations start at the finished floor elevation and stop at the ceiling. Interior Elevations show individual walls in specific rooms, whereas Sections cut through floors showing multiple rooms stacked on top of each other.