Glossary


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Accuracy
The closeness of measurement or estimates to the true value. Accuracy is normally represented by the standard deviation of errors.

A/D
Conversion from analog to digital.

Affine Transformation
A type of linear coordinate transformation to correct shift, scale and skew errors.

AM/FM
Automated mapping and facility management refer to large scale mapping and network analysis mainly for utilities such as gas pipelines, cables, water supply, sewage etc., using a huge volume of utility database in link with geocode.

Area
Closed area surrounded with a series of lines or chains. Area is sometimes called polygon.

Aspect
Azimuth that the surface slope faces.

Attributes
Attributes are called sometimes thematic data or non-spatial data. Attributes refer to a defined characteristic of an entity in the real world. Attributes include nominal, ordinal, numerical, conditional and other characteristics.


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