GIS terms starting with T

39 terms

table A set of data elements that has a horizontal dimension (rows) and a vertical dimension (columns) in a relational database system.
Tabular Data Descriptive data stored in rows and columns in a database that can be linked to spatial data.
Tagged interchange (image) file format (TIFF) An industry-standard raster data format. TIFF supports black-and-white, gray-scale, pseudocolor, and true-color images, all of which can be stored in a…
Tax Lot A unit of land assigned by the real property tax administration that usually resides within a square. Often referred to as A&T lots or simply tax lots.
Template a standard shape that the race car must comply to be within the NASCAR rules. The template closely resembles the shape of the factory car.
Terabyte (TB) A terabyte is a measure of computer data storage capacity and is one thousand billion (1,000,000,000,000) bytes.
terminal A device, usually a display monitor and a keyboard, used to communicate with the computer.
Text attribute table (TAT) Text attribute table for an annotation subclass in a coverage. In addition to user-defined attributes, the TAT contains a sequence number and text feature…
text symbol A text style defined by font, size, character spacing, color, and so on, used to label maps and coverage features in ARC/INFO.
thematic data See descriptive data.
Theme A user-defined perspective on a coverage, grid, tin or image geographic data set specified, if applicable, by a coverage name and feature class or data…
Thiessen polygons Polygons whose boundaries define the area that is closest to each point relative to all other points. Thiessen polygons are generated from a set of points.
TIC (1) Thermionic Integrated Circuit. (2) Technical Information Center.
TIC file The coverage file used to store tic coordinates and tic IDs for a coverage.
tic match tolerance The maximum distance allowed between an existing tic and a tic being digitized.
Tile Pipe made of baked clay.
TIN Theater Intelligence Networks.
to-node Of an arc's two endpoints, the one last digitized. See also from-node.
TOL file A coverage file that contains processing tolerances (fuzzy, tic match, dangle length) and editing tolerances (weed, grain, edit distance, snap distance…
Topographic map A map indicating surface elevation and slope. U.S. Geological Survey quadrangle series maps showing the shape of the earth's surface by contours.
Topography The shape of the Earth's surface; the relative position and elevations of natural and human-made features of an area.
topological overlay An analysis procedure for determining the spatial coincidence of geographic features. ARC/INFO supports overlay among and between all feature classes.
Topologically Integrated Geographic Encoding and Referencing (TIGER) The Topologically Integrated Geographic Encoding and Referencing data format used by the U.S. Census Bureau to support census programs and surveys.
topology The geometric arrangement of a computer system. Common topologies include a bus (network topology in which nodes are connected to a single cable with…
Tour A tour is a minimum-impedance path that starts at an origin, visits a number of stops and returns to the origin visiting the stops only once.
tracing The process of determining which portions of a network connect.
trade-area map A map showing the region from which a store derives a certain percentage of its revenues.
transaction Includes any series of related steps carried out as part of a prearranged plan.
transformation (TRANZ-for-MAY-shun) In medicine, the change that a normal cell undergoes as it becomes malignant.
Transmission Control Protocol/Internet Protocol (TCP/IP) A collection of protocols that define the basic workings of the features of the Internet.
Transportation The means and aids for conveying people and goods. For example, resources describing roads, airports and airstrips, shipping routes, tunnels, railways and…
traveling salesman problem This is a classic tour problem in which a hypothetical salesman must find the most efficient sequence of destinations in his territory, stopping only once…
Triangulated Irregular Network (TIN) A surface representation derived from irregularly spaced sample points and breakline features.
triangulation A method of surveying in the location of an object may be calculated from the known locations of two other objects.
trusted login A user is said to have a trusted login to another computer when that user is not prompted for a password when accessing the remote computer.
tuple A row in a relational table; synonymous with record, observation.
Turn The fourth community card. Put out face up, by itself. Also known as "fourth street."
turn impedance The impedance or cost of making a turn at a network node. A turn impedance for making a left turn can be different from that of a right turn or a U-turn…
turntable An INFO file containing the turn impedances between pairs of network links. There can be sixteen possible turn impedances between four network links…