Intersect-an ARC/INFO overlay command. Intersect is the integration of two spatial data sets that preserves the data that fall within the area common to both in a new theme.

Line-a set of ordered co-ordinates that represent the shape of geographic features too narrow to be displayed as polygons with area at the given scale (contours, street center lines, or streams) or linear features with no area (county boundary lines). A line is synonymous with an arc.

Pediment-buried or exposed erosional surfaces found directly adjacent to mountain fronts. Pediment surfaces are usually cut into bedrock.

Point-a zero-dimensional abstraction of an object represented by a single X,Y co-ordinate. A point normally represents a geographic feature too small to be displayed as a polygon with area; for example, the location of a small structure on a small-scale map or the location of an isolated artifact on a 7.5 minute topo map.

Polygon-a feature used to represent a distinct area. A polygon is defined by the lines that make up its boundary and an identification label point inside its boundary. Polygons have attributes that describe the feature (lake, pitstructure, political state, etc.) they represent.

Relief-refers to the changes in elevation that one experiences when moving over a landscape. High relief = large range of elevations (mountian range). Low relief = small range of elevations (flat plains).

Settlement Archaeology-the study of settlement distributions in the context of their landscape; the study of sites as regionally integrated systems rather than individual autonomous entities.

Settlement Patterns-the distribution of sites across the landscape within a given region; a spatially ordered system of land use.

Spatial Analysis-analytical techniques associated with the study of locations of geographic phenomena together with their spatial dimensions and their associated attributes. Spatial analysis is useful for evaluating suitability, for estimating and predicting, and for interpreting and understanding the location and distribution of geographic features and phenomena.

Stream Terrace-a landform of alluvial origin that occurs along drainages as a result of flooding and erosional events. Terraces parallel a drainage to either side.

Theme-a data layer; a theme contains spatial and tabular data for only one type of ecological or cultural feature. Themes' spatial and tabular data can be combined to form new themes or stacked to produce views.

Topography-the study of the relief of a given area on the Earth's surface, usually on a large scale, including both natural and man-made features.

Topographic Map-a map whose principal purpose is to portray the features of the earth's surface. These features might include the cultural landscape, but normally refer to the terrain and its relief.

Union-the outcome of the union command is an output data layer/theme that retains all the elements of all the input data layers/themes.

View-a type of GIS visual output that is formed by overlaying (stacking) a number of themes from one geographic location on top of one another. Views allow researchers to quickly and easily manipulate a large number of data layers while searching for spatial patterning.