GIS Dictionary

In modeling, the degree to which a model predicts observed data; a measure of predictive power.

A map, shaped like the area between a pair of parentheses, of an area that lies between two lines of

[GPS] Acronym for Global Positioning System. A system of radio-emitting and -receiving satellites used for determining positions on the earth.

[Euclidean geometry] A unit of angular measurement in which the angle of a full circle is 400 gradians and a

1 [geodesy] The ratio between vertical distance (rise) and horizontal distance (run), often expressed as a percentage. A 10-percent gradient

[geodesy] The direction of the maximum increase in gravity in a horizontal plane.

A map on which a range of colors indicates a progression of numeric values. For example, increases in population density

A map with symbols that change in size according to the value of the attribute they represent. For example, denser

[data capture] In ArcInfo Workstation, a parameter controlling the number of vertices and the distance between them on lines that

1 [data quality] The coarseness or resolution of data. Granularity describes the clarity and detail of data during its capture

[graphics computing] An image produced by and stored in a computer as data for display.