2011

Table Of Contents
conic projection A map projection in which the surface of the Earth is drawn
as it would appear if projected on a cone wrapped around the earth. The
Lambert Conformal Conic is often used for maps of the continental United
States, France, and other countries.
constraint In a database, a restriction specified for a certain
feature class (page
2063), which is validated when a new feature is added to that class. For example,
a "minor road" feature class may have a constraint that specifies that the speed
attribute must always be 25, 30, or 50 miles per hour.
continuous data Data that can fall anywhere in a broad range. When creating
a theme, continuous data is usually organized into smaller ranges that show
data trends. For example, property value is continuous data that can be placed
into the ranges 0 to $50,000, $50,000 to $100,000, and over $100,000, with
each range displayed in a different color. Compare with
discrete data (page
2060).
contour lines A line that connects points of the same elevation or value
relative to a specified reference datum. The lines can help you determine the
elevation at a specific location on a surface, help clarify and analyze the 3D
surface terrain, and help with things like navigation.
control points Locations with established latitude and longitude, and often
elevation, used for accuracy and precise location of maps. A system of geodetic
control points covers the entire United States. Similar systems exist for all
countries, such as Bench Marks and Trigonometry Points in the United
Kingdom. See also
monuments (page 2069), geodetic coordinate system (page 2064).
coordinate geometry commands See
COGO (page 2057).
coordinate system See
global coordinate system (page 2065).
Create Surface Manager The main user interface for creating grid surfaces
from point cloud data.
credentials The user ID and password required to connect to a database.
cylindrical projection A map projection, in which the surface of the Earth
is drawn as it would appear if projected on a cylinder wrapped around the
earth in a north-south direction. Compare with transverse cylindrical projection
(page 2078). See also Mercator projection (page 2068) and conic projection (page
2058).
dangle A link or line, one end of which lacks a connection to another link or
node.
2058 | Glossary