base elevation

The base elevation for any structure is the vertical distance above Mean Sea Level (MSL) of the bottom point from which its architectural height is measured. This point corresponds to the lowest grade level around the structure's perimeter, normally defined as sidewalk level.

In order to determine any structure's absolute height above sea level, its height can simply be added to its base elevation (with the exception of CTBUH heights, which are measured from entrance level which sometimes differs from ground level).

Related

• elevation above nearest water level