T
table
A set of data elements that has a horizontal dimension (rows) and a vertical dimension (columns). See also attribute table.
table of contents
In ArcMap, the table of contents lists all the data frames and layers on the map and shows what features the symbols in each layer represent. ArcScene also has a table of contents.
tabular data
Descriptive information that is stored in rows and columns and can be linked to map features.
tag
An XML tag that identifies a particular element in an item's metadata. Tags use the form <tag> where tag is a text string up to eight characters.
tagged value
Used to set additional properties of UML elements. For example, you can set the length (in characters) of a string field by using a tagged value.
tangent projection
A form of map projection where the conceptual surface of the projection (cone, cylinder, or plane) just touches the earth's surface. See also secant projection.
target layer
Used in ArcMap editing, a setting in the Target Layer dropdown list that determines the layer to which new features will be added. The target layer is set by clicking a layer in the Target Layer dropdown list. For instance, if you set the target layer to Buildings, any features you create will be part of the Buildings layer. You must set the target layer whenever you're creating new features—whether you're creating them with the Sketch tool, by copying and pasting, or by buffering another feature.
TCP/IP
Transmission Control Protocol (TCP) is a communication protocol layered above the Internet Protocol (IP). These are low-level communication protocols that allow computers to send and receive data.
template
See map template.
temporary dataset
A raster dataset temporarily stored on disk. All output raster results from Spatial Analyst are temporary, unless you specify a location on disk and a filename in a function dialog box, you make the temporary dataset permanent, or you save the map document. In these three cases, temporary results will become permanent datasets on disk. See make permanent.
text box
See edit box.
text label
Text added to a map to help identify features.
3D feature
A representation of a real-world object in a map or scene, with z-values stored within the feature's geometry. Features have geometry and may also have attributes stored in a feature table. PointZ, PolylineZ, PolygonZ, and Multipatch feature classes and shapefiles may contain 3D features.
3D graphic
A graphic object in a map or scene with z-values stored in the graphic's geometry. Graphics do not have attributes.
thumbnail
A snapshot describing the geographic data contained in a data source or layer, or a map layout. A thumbnail might provide an overview of all the features in a feature class or a detailed view of the features in, and the symbology of, a layer. Thumbnails are not updated automatically; they will go out of date if features are added to a data source or if the symbology of a layer changes.
tic
Registration or geographic control points for a coverage representing known locations on the earth's surface. Tics allow all coverage features to be recorded in a common coordinate system such as Universal Transverse Mercator (UTM). Tics are used to register map sheets when they are mounted on a digitizer. They are also used to transform the coordinates of a coverage, for example, from digitizer units (inches) to the appropriate values for a coordinate system (meters for UTM).
TIN
Triangulated irregular network. A surface representation derived from irregularly spaced sample points and breakline features. The TIN dataset includes topological relationships between points and their neighboring triangles. Each sample point has an x,y coordinate and a surface or z-value. These points are connected by edges to form a set of nonoverlapping triangles used to represent the surface. TIN is also called an irregular triangular mesh or an irregular triangular surface model.
TIN dataset
A dataset containing a triangulated irregular network (TIN). The TIN dataset includes topological relationships between points and neighboring triangles. See also TIN.
tolerance
A coverage has many processing tolerances (fuzzy, tic match, dangle length) and editing tolerances (weed, grain, edit distance, snap distance, and nodesnap distance). Stored in a TOL file, ArcInfo uses the tolerance values as defaults in many automation, editing, and processing operations. You can edit a coverage's tolerances using its Properties dialog box in ArcCatalog.
tool
An entity in ArcToolbox that performs a specific geoprocessing task such as generalizing lines. A tool can belong to two or more toolsets.
A command that requires interaction with the user interface before an action is performed. For example, with the Zoom In tool, you must click or draw a box over the geographic data or map before it is redrawn at a larger scale. Tools can be added to any toolbar.
toolbar
A set of commands that let you carry out related tasks. The Main Menu toolbar has a set of menu commands; other toolbars typically have a set of buttons. Toolbars can float on the desktop in their own window, or you can dock them at the top, bottom, or sides of the main window.
Toolbox tree
Displays ArcToolbox toolsets and tools grouped by functionality.
toolset
A group of tools that perform similar geoprocessing tasks. Custom toolsets can be created within the My Tools toolset to hold custom tools as well as to group frequently used ArcToolbox tools.
topological association
The spatial relationship between features that share geometry such as boundaries and vertices. When you edit a boundary or vertex shared by two or more features using the topology tools in ArcMap, the shape of each of those features is updated.
topological feature
A feature that supports network connectivity that is established and maintained based on geometric coincidence.
topology
In geodatabases, relationships between connected features in a geometric network or shared borders between features in a planar topology.
In coverages, the spatial relationships between connecting or adjacent features (for example, arcs, nodes, polygons, and points). The topology of an arc includes its from- and to-nodes and its left and right polygons. Topological relationships are built from simple elements into complex elements: points (simplest elements), arcs (sets of connected points), areas (sets of connected arcs), and routes (sets of sections, which are arcs or portions of arcs). Redundant data (coordinates) is eliminated because an arc may represent a linear feature, part of the boundary of an area feature, or both.
tracing
The process of building a set of network features based on some procedure.
transaction
A logical unit of work as defined by a user. Transactions can be data definition (create an object), data manipulation (update an object), or data read (select from an object).
triangle
Triangles form the faces on a TIN surface. Each triangle on a TIN surface is defined by three edges and three nodes, and is adjacent to one to three other triangles on the surface. TIN triangles can be used to derive aspect and slope information, and may be attributed with tag values.
trigonometric functions
Operators within the Raster Calculator of Spatial Analyst. They perform various trigonometric calculations on the values in an input grid.
Available trigonometric functions: Sin, Cos, Tan, Asin, Acos, Atan
true curve
See parametric curve.
true-direction projection
A form of projection that shows lines with correct azimuths from one or two points.
tuple
A row in a relational table; synonymous with record, observation.</dd>

U
UIControl
A UIControl lets you create a custom command with VBA. There are four different types of UIControls: buttons, tools, combo boxes, and edit boxes.
UML
Unified Modeling Language. A standard for representing object designs. See also CASE.
undershoot
An arc that does not extend far enough to intersect another arc. See also dangling arc.
uninitialized flow direction
For an edge feature in a network, a condition that occurs when the edge feature is not topologically connected through the network to sources and sinks or if the edge feature is only connected to sources and sinks through disabled features.
union
A topological overlay of two polygonal spatial datasets that preserve features that fall within the spatial extent of either input dataset; that is, all features from both coverages are retained. See also intersect and identity.
unit of measure
See angular units or linear units.
username
The identification used for authentication when you log in to a geodatabase.
UTM
Universal Transverse Mercator. A projected coordinate system that divides the world into 60 north and south zones, six degrees wide.

V
validation rule
Validation rules can be applied to objects in the geodatabase to ensure that their state is consistent with the system that the database is modeling. The geodatabase supports attribute, connectivity, relationship, and custom validation rules.
variogram
A function of the distance and direction separating two locations that is used to quantify autocorrelation. The variogram is defined as the variance of the difference between two variables at two locations. The variogram generally increases with distance and is described by nugget, sill, and range parameters.
variography
The process of estimating the theoretical variogram. It begins with exploratory data analysis, then computing the empirical variogram, binning, fitting a variogram model, and using diagnostics to assess the fitted model.
VAT
Value attribute table. A table containing attributes for a grid. In addition to user-defined attributes, the VAT contains the values assigned to cells in the grid and a count of the cells with those values.
VBA
Visual Basic for Applications. The embedded programming environment for automating and customizing ESRI end-user applications such as ArcMap and ArcCatalog. It offers the same powerful tools as Visual Basic (VB) in the context of an existing application and is the best option for customizing software that already meets most needs. By contrast, VB is a standalone tool for rapidly creating a special solution from scratch, be it an executable program, COM component, or an ActiveX&reg; control. An application that uses ArcMap or ArcCatalog may require the development of a COM component; consequently, in such instances, VB is the appropriate development environment.
vector
A coordinate-based data structure commonly used to represent linear geographic features. Each linear feature is represented as an ordered list of vertices. Traditional vector data structures include double-digitized polygons and arc–node models.
vector model
A representation of the world using points, lines, and polygons. Vector models are useful for representing and storing discrete features such as buildings, pipes, or parcel boundaries.
version
In geodatabases, an alternative representation of the database that has an owner, a description, a permission (private, protected, or public), and a parent version. Versions are not affected by changes occurring in other versions of the database.
version merging
The process of reconciling two versions of a feature dataset into a common version. If conflicting edits have been made in either of the merged versions, these conflicts are resolved, either automatically or by an interactive process.
version reconciliation
The process of updating a version of a dataset with changes made in another version. Using this technique, a version can remain up to date with changes even if it is within a long transaction lasting many months.
vertex
One of a set of ordered x,y coordinate pairs that define a line or polygon feature.
vertical exaggeration
The amount by which the z-values in the scene are multiplied in order to enhance details in the shape of the surface. Scenes may appear flat when the range of x- and y-values is much larger than the z-values. In most cases, setting vertical exaggeration can compensate for this flattening by increasing relief.
viewer
An additional window that allows you to view the 3D data in a scene from another angle. You can have multiple viewers in a scene.
views
Different ways to see the contents of the selected item in the Catalog tree in ArcCatalog.
viewshed
The viewshed identifies the cells in an input grid that can be seen from one or more observation points or lines. This is useful for applications where the visibility of an object is important, such as finding well-exposed places for communications towers, or hidden places for parking lots or other facilities.
virtual page
The map page as seen in layout view in ArcMap.
volume
The space (measured in cubic units) between a TIN surface and a plane at a specified elevation. Volume may be calculated above or below the plane.
VPF
Vector Product Format. A U.S. Department of Defense military standard that defines a standard format, structure, and organization for large geographic databases. VPF data is read-only in ArcCatalog.

W
WAN
Wide area network. A computer data communications technology that connects computers at remote sites (for example, city to city) to computers at other remote sites. WANs are composed of special data communications hardware and software and usually operate across public or dedicated telephone networks. Typically, data access over a WAN is slower than over a LAN. See also LAN.
warp
Transforming a raster to map coordinates.
weight
A property of a network feature typically used to represent a cost for traversing across an edge or through a junction. For example, in a water network, a certain amount of pressure is lost when traveling the length of a transmission main due to surface friction within the pipe. Weights are calculated based on some attribute of each feature. In this same transmission main example, an attribute that affects the weight would be the length of the feature.
weight filter
A specification of which network features can be traced based on their weight values.
WGS 1984
World Geodetic System of 1984. A geocentric datum and geographic coordinate system created by the United States military and in worldwide use. Also known as WGS84.
wizard
A tool that leads a user step by step through an unusually long, difficult, or complex task.
work flow
An organization's established processes for design, construction, and maintenance of facilities.
work order
One specific task which proceeds through each stage of an organization's work flow process, including design, acceptance, and construction in the field.
working directory
A directory specified in the General tab of the Options dialog box in Spatial Analyst. It indicates the appropriate location on disk to place all results from analysis. All permanent and temporary results will be written here, unless otherwise specified in a function dialog box.
workspace
A container for file-based geographic data. This can be a folder that contains shapefiles, an ArcInfo workspace that contains coverages, a personal geodatabase, or an ArcSDE database connection.

X
XML
Extensible markup language. A markup language similar to HTML. With XML you define data using tags that add meaning. For example, <title>California geology</title> declares the text "California geology" to be a title, perhaps for a map. An XML file does not contain information about how to present the data. XML is well formed if an opening tag, such as "<title>", and a closing tag, such as "</title>", appear before and after each piece of data.
XSL
Extended stylesheet language. XSL is a defined set of XML tags that can be used to query and evaluate XML data. XSL stylesheets are used in ArcCatalog to present metadata. See also stylesheet.

Y
Z
zonal functions
This group of functions creates an output raster in which the computation of the desired function occurs on the cell values from the input value raster that intersect or fall within each zone of a specified input zone dataset. The input zone dataset is only used to define the size, shape, and location of each zone, while the value raster is used to identify the values to be used in the evaluations within the zones.
zonal statistics
A Spatial Analyst function that calculates a statistic for each zone of a zone dataset based on values from another dataset. A single output value is computed for every zone in the input zone dataset.
zone
All cells in a raster with the same value, regardless of whether they are contiguous.
zoom
To enlarge and display greater detail of a portion of a geographic dataset.
z-factor
An option in Spatial Analyst and 3D Analyst. The number of ground x,y units in one surface z unit. The input surface values are multiplied by the specified z-factor to adjust the output grid z units to another unit of measure.
z-value
A value represented on the z-axis in a three-dimensional x,y,z coordinate system. The values on a terrain, or chemical concentration, surface can be used as z-values when rendering the surface in 3D. Numeric attributes of features, for example, the number of floors in a building, can also be used as z-values.
 

要是中文的就好了。

<P>这么多啊</P>

LZ，<img src="images/post/smile/dvbbs/em02.gif" />,有中文的就好了。

不错，学习了