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;<span id="Ceiling">Ceiling</span>
;<span id="Ceiling">Ceiling</span>
:[http://en.wikipedia.org/wiki/Ceiling '''Wikipedia:'''] A ceiling is an overhead interior surface that covers the upper limit of a room. It is not generally considered a structural element, but a finished surface concealing the underside of the floor or roof structure above.
:[http://en.wikipedia.org/wiki/Ceiling '''Wikipedia:'''] A ceiling is an overhead interior surface that covers the upper limit of a room. It is not generally considered a structural element, but a finished surface concealing the underside of the floor or roof structure above.
;<span id="CCRS">Compound Coordinate Referencesystem (CCRS)</span>
:'''ISO 19111:''' Coordinate reference system using two other independent coordinate reference systems to describe a position.
:The horizontal and vertical components of a description of position in three dimensions may sometimes come from different coordinate reference systems rather than through a single three-dimensional coordinate reference system. This is always the case for positions where vertical coordinates are related to mean sea level. This shall be handled through a compound coordinate reference system which identifies the two coordinate reference system utilized.
:Notification by using a "*" combining the two coordinate reference systems, e.g. DE_DHDN_3GK2_RDN*DE_DHHN92_NH
==D==
==D==