Listing of Glossary
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a system used to encode the results of a measurement; typically a number line, but generalized to include a list of categories.
a multicomponent property associated with a surface at each point; the vertical component (gradient) expresses the local rate of change, the horizontal component (aspect) gives the direction.
a category of soil expected to occur inside the units mapped as another category.
degree of correlation between a surface value and the values of its neighbors; propensity of spatial data to vary smoothly.
|Spatial object framework||
a measurement framework that identifies a particular category, then maps the location of that object (as a point, a line or an area).
|Spatial reference system||
a mechanism to situate measurements on a geometric body, such as the Earth; establishes a point of origin, orientation of reference axes, and geometric meaning of measurements, as well as units of measure. [basis of coordinates.]
Structured Query Language; a standard interface for access to a relational database through queries that select records matching logical expressions.
a spatial distribution which associates a single value with each position in a plane; (technically a field of a single-valued function) usually associated with continuous attributes.
A device for converting images from maps, photographs, or from part of the real world into digital form automatically.
An earth resource satellite with high resolution sensors launched by France in January 1986.