Metadata are data about data. We provide
geospatial metadata,
information about geospatial data such as images of the earth, maps and
the geographical features that maps represent. Geospatial metadata are
structured in a consistent way so that once you get used to the format,
like cards in a library catalog, it becomes easy to find out what you
need to know.
Writing metadata? Get tools and help at <http://geology.usgs.gov/tools/metadata/>