Definitions

Arcview: A GIS software package from ESRI

Attribute: A piece of information describing a map feature. Attributes of a river may include:name, length, depth etc.

Chart:A graphic representation of tabular data.

Database: A collection of interrelated information stored in tables. In GIS, spatial data, shapes and attributes of geographic features may be stored.

Data dictionary: A catalog describing the data stored in a GIS database. A data dictionary includes such information as the full name of each attribute, meanings of codes, scales of source data, accuracy of locations, and map projections.

Data dictionary for BASINS may be found here

Document: A component of an Arcview project. Each document type(view,table, chart, layout, script) has its own window and interface.

ESRI: Environmental Systems Research Institute. It is a company that produces GIS and other environmentally related software.

Feature: A map representaion of a geographic object. In arcview, there are three types of features: points, polygons and lines.

Field: A column in a table which is part of a database. This column contains the values for a single attribute. In Arcview, fields can be in numeric, string, date or Boolean formats.

Filtering: In Arcview, an operation that hides(without deleting) specified theme features in a view.

GIS: Acronym for geographic information system.

Hot Link: In Arcview, a theme property that allows you, by clicking on a feature in a view, to display images and text files, open documents or projects, and run scripts.

Point feature: A point on a map representing a geographic object too small to show as a line or polygon. Some examples are wells and fire hydrants.

Polygon: A polygon on a map representing a geographic object too large to be depicted as a point or a line.

Project: In Arcview, a file for organizing related documents. A project brings together all the views, tables, charts, layouts and scripts that are used to complete a task or manage a process.

Query:In Arcview, a logical statement used to select features or records. A simple query contains a field name, an operator(such as =, and, not) and a value.

Shapefile: Arcview's format for storing the location,shape, and attribute information of geographic features.

Spatial data: Information about locations and shapes of objects found on the earth's surface.

Symbol: A particular graphic element used to draw a feature. This element is usually defined by some combination of shape, size, color, angle, outline and fill pattern.

Table: In Arcivew, a data structure that stores attributes in rows and columns. It is an integral part of the database.

Table of contents: In Arcview, it is the left part of the view which contains all themes that belong to that particular view.

Theme: In Arcview, a set of geographic features of the same type along with their attributes. Examples are: world rivers, the airports in a state.

Theme table: A table associated with a particular theme, in which each record corresponds to one theme feature. A theme table has a Shape field that displays the feature type of each feature in the theme and also contians its location information.


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