Preskočite na glavni sadržaj
Login
State Geodetic Administration logo National Spatial Data Infrastructure logo

Topological Consistency: Quantitative results

Name Topological Consistency: Quantitative results
Definition The correctness of the explicitly decoded topological characteristics of the dataset as prescribed.
Obligation
  • dataset or dataset series: conditional; mandatory if the data set includes types from the Generic Network Model and does not assure centreline topology (connectivity of centrelines) for the network
  • service: not applicable
Multiplicity [0..*]
Example
Name: number of incorrectly connected points and curves
Type: indirect
Description: The connection between a point and a curve exists at the points where different curves touch. Curves have an inherent topological relationship that represents their actual position and interrelationship. If the connection between the point and the curve does not comply with the prescribed rules, it is considered faulty in relation to this quality measure. Data quality is expressed by the number of incorrectly connected points and curves.
Date and time: 2015-04-01T16:20:00
Unit of measurement: http://www.opengis.net/def/uom/OGC/1.0/unity
Value: 12
This metadata element documents the topological consistency of the spatial data of a dataset or dataset series expressed by quantitative results and a description of the implemented specific measure of topological consistency quality. The element must contain at least: the quantitative value of the results and the corresponding unit of measurement. It is recommended to provide additional information on the test performed: name or more of them, brief description, type (if applicable; ISO 19139 DQ_EvaluationMethodTypeCode code list value) and date and time (according to ISO 8601 standard) of the test performed.

Technical data
 
INSPIRE equivalent Topological Consistency - Quantitative results
Comparison with INSPIRE equivalent
ISO equivalent [80] report
Comparison with ISO equivalent
XPath dataQualityInfo/DQ_DataQuality/report/
Data type DQ_TopologicalConsistency
Domain DQ_TopologicalConsistency [ISO 19115]
Implementation instructions Quantitative results of topological consistency testing, ie element gmd:result/gmd:DQ_QuantitativeResult must contain at least:
 
  • the quantitative value of the results in the gmd:value/gco: Record element and
  • the corresponding unit of measure in the gmd:valueUnit element.

It is recommended to provide additional information on the performed test, ie to document:
 
  • the name of the test performed using one instance of gmd:nameOfMeasure element or more in case the test result refers to several tests performed,
  • a brief description of the test performed using the gmd:evaluationMethodDescription element,
  • the type of test performed, if possible, in such a way that the gmd:evaluationMethodType/gmd:DQ_EvaluationMethodTypeCode element contains the corresponding value of the ISO 19139 DQ_EvaluationMethodTypeCode code list,
  • the date and time of the test performed using the gmd:dateTime/gco:DateTime element in the Gregorian calendar and in accordance with the ISO 8601 standard.

Encoding example: Documenting the quantitative results of topological consistency analysis
 
<gmd:MD_Metadata…
…
    <gmd:dataQualityInfo>
        <gmd:DQ_DataQuality>
…
            <gmd:report>
…
                <gmd:DQ_TopologicalConsistency>
                    <gmd:nameOfMeasure>
                        <gco:CharacterString>number of incorrectly connected points and curves​</gco:CharacterString>
                    </gmd:nameOfMeasure>
                    <gmd:evaluationMethodType>
                        <gmd:DQ_EvaluationMethodTypeCode codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#DQ_EvaluationMethodTypeCode" codeListValue="indirect">indirect</gmd:DQ_EvaluationMethodTypeCode>
                    </gmd:evaluationMethodType>
                    <gmd:evaluationMethodDescription>
                        <gco:CharacterString>The connection between a point and a curve exists at the points where different curves touch. Curves have an inherent topological relationship that represents their actual position and interrelationship.  If the connection between the point and the curve does not comply with the prescribed rules, it is considered faulty in relation to this quality measure. Data quality is expressed by the number of incorrectly connected points and curves.​</gco:CharacterString>
                    </gmd:evaluationMethodDescription>
                    <gmd:dateTime>
                        <gco:DateTime>2015-04-01T16:20:00</gco:DateTime>
                    </gmd:dateTime>
                    <gmd:result>
                        <gmd:DQ_QuantitativeResult>
                            <gmd:valueUnit xlink:href="http://www.opengis.net/def/uom/OGC/1.0/unity"/>
                            <gmd:value>
                                <gco:Record xmlns:xs="http://www.w3.org/2001/XMLSchema" xsi:type="xs:integer">12</gco:Record>
                            </gmd:value>
                        </gmd:DQ_QuantitativeResult>
                    </gmd:result>
                </gmd:DQ_TopologicalConsistency>
…
            </gmd:report>
…
        </gmd:DQ_DataQuality>
    </gmd:dataQualityInfo>
…
</gmd:MD_Metadata>