2011

referenced data. A GIS is used to capture, store, retrieve, analyze, and display
spatial data.
global coordinate system A method that converts the spherical coordinates
of the Earth representing latitude and longitude into an AutoCAD Map 3D
drawings Cartesian coordinate system, and accounts for the curvature of the
surface of the Earth with a projection. A coordinate system is usually defined
by a projection, an ellipsoid definition, a datum definition, one or more
standard parallels, and a central meridian.
graticule A network of geographic lines, such as latitude and longitude lines.
See also
grid reference system (page 2065).
grid reference system A grid-based Cartesian coordinate system. The
Universal
Transverse Mercator (UTM)
(page 2078) coordinate system is a grid reference
system.
grid surface See surface (page 2076).
Grid Zone Designator (GZD) The first part of a
grid reference system (page
2065)coordinate. The grid zone designator specifies the 6 by 8 degree UTM zone
number and latitude letter.
hatch A regular pattern used to fill an area with a series of cross-angled lines.
hillshading The addition of shading to a surface to suggest
three-dimensionality, shadow, or degrees of light and dark. Hillshading adds
shading by casting the light of the sun across a surface from the direction and
angle you specify.
implicit checkout The action of checking out features by selecting them,
without using the Check Out Features command. See also
checkout (page 2057),
explicit checkout (page 2062).
index file A point cloud data store file created by the
Point Cloud Manager
(page 2071). Index files allow AutoCAD Map 3D to access point cloud data more
quickly and efficiently.
inner join A type of join where records in the primary table are displayed
only if there is a matching record in the joined secondary table. See also join,
left outer join.
intersection (expression) Two or more conditions joined with the logical
operator And. An item is selected only if the item meets all specified conditions.
Compare with
union (page 2078).
intersection (geometry) The location where one line, surface, or solid crosses
another so as to have one or more points in common.
Glossary | 2065