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Glossary
table
A set of data with a horizontal dimension (rows/records) and a vertical dimen-
sion (columns/fields). A table has a specified number of columns and any number of
rows. Tables are typically stored in relational databases (RDBMS), such as Oracle or
Access, but can also be stored in files such as Excel spreadsheets and delimited text files.
Tagged Image File Format (TIFF)
A format for compressing raster images that is
widely used and supported.
Targa
See
TrueVision Targa 2.0.
template
A saved map layer file (
.mlf
) that you can add to any map. Templates save
time, as you can open an existing template (map layer file) and simply modify the prop-
erties you want to change, rather than creating a new layer and having to set all of its
properties.
text
A textual description, composed of printable characters, that you define in a map
layer. Text entities are often used to label the graphic representations of spatial features.
TFW
See
georeferencing file
.
TGA
See
TrueVision Targa 2.0
.
theme
A set of categories that display the map features with different styles and sym-
bols to depict different values. A theme can have categories for a range of values (such
as displaying countries in varying colors between black and white to show heavy and
light population) and for individual values (such as displaying highways in red and sur-
face streets in black). Examples of themes might be property assessment, housing qual-
ity, population density, and average rainfall.
TIFF
See
Tagged Image File Format
.
ToolTip
An online Help feature that displays a brief explanation of a toolbar button
when you hold the mouse pointer over the button for more than a second. See also
MapTip
.
TrueVision Targa 2.0 (TGA)
A format for compressing raster images also referred to as
TARGA.
UCS
A coordinate system that defines the orientation of the
X,Y,
and
Z
axes in three-
dimensional space. The UCS determines the default placement of geometry in a drawing.
UDL
See
Microsoft Data Link files
.
UNC
See
Universal Naming Convention.
units
The unit of measurement used in all areas where a distance is specified or dis-
played. You can specify that a map use U.S. units or metric units using the Preferences
dialog box in Autodesk MapGuide Author or Autodesk MapGuide Viewer.
Universal Naming Convention (UNC)
The standard method of specifying the full
path name of a file. For example, to specify a file named
ROADS.SDF
in a folder named
SDF
on a computer named
Data
with the share name
CDrive
, you would type
\\Data\CDrive\SDF\ROADS.SDF
. If the computer is mapped to a drive letter, you could
use the drive letter in the path, such as
D:\SDF\ROADS.SDF
, but it is safer to use the
UNC, just in case, for example, the drive mapping is lost.
vertex
One of a set of ordered
XY
coordinates that constitute a map feature.
width ratio
The ratio of text character width to text character height. For example, if
the font size is 20 mm, and the width ratio is 0.5, the width of a text character is 10 mm.
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