Attribute
A characteristic of a geographic feature described by numbers or letters, typically stored in tabular format and linked to the feature in a relational database. The attributes of a well represented by a point might include depth, location, and permit number.

AVL
Automated Vehicle Location. These systems provide real-time location of vehicles equipped with a global positioning system (GPS). The GPS satellite transmits vehicle location information to the transit center.

Buffer
A zone of a specified distance around coverage features. Both constant and variable width buffers can be generated for a set of coverage features based on each features attribute values.

Coordinates
Consists of x and y components representing north/south and east/west directions
for a geographic feature.

Database
A logical collection of interrelated information, managed and stored as a unit.

Database Management System
Database Management System. Software that manages, manipulates and retrieves data in a database.

DCW
"Digital Chart of the World." The first 1:1,000,000-scale digital basemap of the world. The DCW contains topologically based vector data digitized from the U.S. Defense Mapping Agency's Operational Navigation Charts.

Data Integration
Data integration means that by using one or more Databases, several data tables and layers we would be able to observe the information on a complete map

Field
In a database, another term for column

Geospatial Data
Information that identifies the geographic location and characteristics of natural or
Constructed features and boundaries on the Earth. Descriptive Data – Tabular Data

GIS
Geographic Information System. Computer technology for capturing, managing,
Integrating, manipulating, analyzing and displaying data that is spatially referenced
to the Earth

GPS
Global Positioning System. The GPS is supported by a constellation of United
States satellites that continuously radio position signals to Earth stations, resulting
in precise ground location information.

Layer
A logical set of thematic data described and stored in a map library. Layers organize a map library by subject matter, e.g., soils, roads, wells, and extend over the entire geographic area defined by the spatial index of the map library.

Map
An abstract representation of the physical features of a portion of the Earth's surface graphically displayed on a planar surface. Maps display signs, symbols, and spatial relationships among the features.

Object
A set of points, lines or polygons in a spatial database that represent a real-world entity.

Polygon
A multisided figure that represents area on a map. A feature defined by the arcs that make up its boundary.

Raster
Data displayed as discrete picture elements (pixels).

Remote Sensing
The observation and measurement of an object without being in physical contact
with it. Most often associated with measurements of the Earth’s surface.

spatial
An adjective applied to objects that vary in space in two or three dimensions.

Table
Is attached to a data layer that contains many characteristics of a feature on a map. The table is made of columns and rows where the columns represent values or description for different attributes and each row represents a different feature.

UTM
Universal Transverse Mercator. An equal-area geographic map projection of
Earth (60 zones, each covering 6 degrees longitude).

Vector
An abstraction of the real world in which spatial elements are represented in the
form of points, lines, and polygons that are geographically referenced to a
coordinate system.

Web GIS
By the term WebGIS is understood generally a geo information system ( GIS), its function is partly based on the basis of the network technology ( InterNet , Intranet). Synonymously WebGIS with that is often used terms GIS on-line, InterNet GIS, NetGIS, Distributed GIS or InterNet Mapping.

Zoom
To enlarge and display greater detail of a portion of a geographic data set.