National Geologic Map Database
The National Geologic Map Database Project (NGMDB) is a collaborative effort primarily involving the
USGS and the Association of American State Geologists (AASG). This Web page contains information
regarding the development of methods and standards intended to address a fundamental requirement
of the NGMDB's authorizing legislation, the Geologic Mapping Act of 1992:
"Geologic maps contributed to the national archives [the NGMDB] should have standardized format, symbols, and technical attributes so that archival information can be assimilated, manipulated, accessed, exchanged, and compared efficiently and accurately."
Geologic Mapping Act of 1992, section 31f(b)
