2011

Data Connect The window you use to connect a geospatial data store (page
2059) to your map. You specify each
feature class (page 2063) from that data store
to add to your map.
data element (metadata) A single piece of data that can be entered directly,
as a value in a field. In the Metadata feature, single data elements are expressed
as fields to be completed with values defined in the FGDC CSDGM Standard
(page 2063). See also: compound element (metadata) (page 2057).
data provider A recognized
FDO (page 2062) feature source provider, used to
connect to geospatial data.
data source A UDL (universal data link) file that points to a collection of data
and provides information on how to access the data.
data store In FDO (page 2062), a collection of feature classes contained in a
single storage location. The data store consists of an integrated set of objects,
which are modeled by classes or feature classes defined within one or more
schemas. Data stores can be either file-based, such as SDF, or a database, such
as Oracle Spatial. See also
FDO provider (page 2063) and feature class (page 2063).
Data Table In AutoCAD Map 3D, a grid based on
FDO (page 2062) data, in which
you can view and edit attributes of selected map features, perform searches,
and work with selection sets.
Data View In AutoCAD Map 3D, the grid in which you can view and edit
external database tables that are linked to drawing objects.
database query A set of conditions for specifying the selection of records from
a database. External database queries, also called views, are created using your
database software and can be run from the
Map Explorer (page 2068) tab of the
Task Pane (page 2076). See also map query (page 2068).
datum A mathematical model that provides a smooth approximation of the
earths surface. Each datum includes both an ellipsoid, which specifies the size
and shape of the earth, and a base point for latitude and longitude. If two
maps use different datums, points on the map may not line up. Also called a
geodetic coordinate system (page 2064).
DEM Digital Elevation Model. A file that contains a representation of surface
terrain. The surface is stored as a grid in which each cell can have any one of
several different meanings, such as elevation, color, density, and so on.
digitize To convert existing data from paper maps, aerial photos, or raster
images into digital form by tracing the maps on a digitizer. Object locations
are recorded as X,Y coordinates.
Glossary | 2059