Listing of Glossary

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Parcel	contiguous unit of the earth's surface defined by a common collection of legal rights.
Pixel	smallest resolvable unit in an image; an area (usually rectangular) forming a part of a systematic, uniform division of a study area. Contraction of picture element.
Point-in-polygon	procedure to determine which points fall into which polygons; can attach attributes to either the points or the polygons.
Polygon	an area (bounded continuous two-dimensional object) consisting of an interior area, one outer ring and zero or more non- intersecting non-nested inner rings.
Polygon overlay	a procedure that calculates the geometric relationships between two geographic representations (usually applied to vector models); used to merge attribute information .
Projection	coordinate transformation that converts latitude longitude measurements into planar coordinates. Projections can be based on a developable surface (such as a plane, cylinder, or cone) or on a mathematical function.
Prototype	an approach to categorization that defines a category by identifying a particular object as the typical example. Other objects assigned to this category may not not share all characteristics with the prototype object. The degree of resemblance can be treated as a distance in a taxonomic space.
Plotter	A device for outputing hard-copy representations of data e.g maps
Pan	To move the viewing window up, down, or sideways to display areas in a geographic data set which, at the current viewing scale, lie outside the viewing window.