Absolute Horizontal Accuracy (95%)

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Link Semantic Value
Term Absolute Horizontal Accuracy (95%)
Status


Mandatory for


Contexts


Categories


Synonyms

Geographical Accuracy

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Broader term


Narrower term


Definition

The difference between the recorded horizontal coordinates of a feature and its true position referenced to the same geodetic datum expressed as a circular error at 95 percent probability.

Definition Source

  • AIFDD

Note

It may also be applied to a data set. If the data contains multiple accuracies, usually the worst accuracy which applies to 10% or more of the data is recorded. Circular error probability (CEP) is the radius of a circle within which a stated percentage of measurements for a given point will fall. For example, if the horizontal accuracy of a surveyed point is stated as one metre with 95 percent CEP, then 95 percent of measurements of the position of this point will fall within a circle of one metre radius. The true position is then estimated to lie at the centre of this circle.