Absolute Vertical Accuracy (95%) (AV5)

DGIF baseline 2026-1, the latest. Earlier baselines: timemap.

Name

absoluteVertAccuracy95

Datatype

Real

Definition

The difference between the recorded elevation of a feature and its true elevation referenced to the same vertical datum expressed as a linear 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. Linear error probability (LEP) is the linear magnitude within which a stated percentage of measurements for a given point will fall. For example, if the vertical accuracy of a surveyed point is stated as one metre with 95 percent LEP, then 95 percent of measurements of the height of this point will fall along a vertical line of length one metre. The true position is then estimated to lie at the centre of this vertical line.

Synonyms

Elevation Accuracy

Accepted

2013-10-18

Defined by

DFDD

Physical quantity

length

Recommended unit

Metre (m)

Used by

ZI011 Vertical Coordinate Metadata