URI: http://www.qualityml.org/1.0/metrics/ConfidenceEllipse
Name: Confidence ellipse
Alternative names: confidence point error ellipse
Definition:

2D ellipse with the two main axes indicating the direction and magnitude of the highest and the lowest uncertainty of a 2D point

The process of calculating this statistic starts defining a covariance matrix.

Confidence ellipse

Parameters: a, b, angle in Multiple values, confidence
Source: ISO 19157
Categories: Positional accuracy
Further information:  
XML schema:
<schema xmlns:qml="http://www.qualityml.org/1.0" 
xmlns:un="http://www.uncertml.org/2.0" 
xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.qualityml.org/1.0" 
elementFormDefault="qualified" attributeFormDefault="unqualified">
<import namespace="http://www.uncertml.org/2.0" schemaLocation="../../uncertml/2.0/uncertml.xsd"/>
<element name="ConfidenceEllipse" type="qml:ConfidenceEllipseType" substitutionGroup="un:AbstractSummaryStatistic"/>

<complexType name="ConfidenceEllipseType">
<complexContent>
<extension base="un:AbstractSummaryStatisticType">
<sequence>
<element name="a" type="un:ContinuousValuesType"/>
<element name="b" type="un:ContinuousValuesType"/>
<element name="a_angle" type="un:ContinuousValuesType"/>
</sequence>
<attribute name="confidence" use="required">
<simpleType>
<restriction base="double">
<pattern value="0.683"/>
<pattern value="0.95"/>
<pattern value="0.99"/>
</restriction>
</simpleType>
</attribute>
</extension>
</complexContent>
</complexType>

XML example:
<un:StatisticsCollection xmlns:qml="http://www.qualityml.org/1.0"      
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"     
xsi:schemaLocation="http://www.qualitymlorg/schemas/qualityml/1.0/qualityml.xsd">
<qml:ConfidenceEllipse confidence="0.683">
<qml:a>6.28 6.28</qml:a>
<qml:b>3.14 3.14</qml:b>
<qml:a_angle>1.57 1.57</qml:a_angle>
</qml:ConfidenceEllipse>
JSON example:
N/A
API example:
N/A
Value constraints: categories: any string
counts: any positive natural number