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Absolute Horizontal Accuracy (95%) (AH5)
DGIF baseline 2026-1, the latest. Earlier baselines: timemap.
RDF: ah5.ttl
- Name
absoluteHorizAccuracy95- Datatype
- Real
- 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.
- Description
- 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.
- Synonyms
- Geographical Accuracy
- Accepted
- 2013-10-18
- Defined by
- DFDD
- Physical quantity
- length
- Recommended unit
- Metre (m)
- Used by
- ZI010 Horizontal Coordinate Metadata
Source: DGIF 2026-1 QEA model, DGIWG. Standard: DGIWG 206-3. Licence: CC BY 4.0, © DGIWG.