Monumentation is the act of establishing a physical ["monument"] (such as a benchmark disk) at a measured location. This usage is commonly seen as "monumentation date", meaning the date the monumentation was done.

All of the types of monumentations recognized by the NGS are listed in the [http://www.ngs.noaa.gov/PC_PROD/DDPROC4.XX/dformat.documentation.html#A.12 NGS Monumentation Code List] , along with with their monumentation codes.