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| CityGML 2.0 strongly recommends the specification of a reference coordinate system. For a meaningful use of data a valid reference coordinate system is imperative, therefore a valid reference coordinate system must be defined for each instance file: | | CityGML 2.0 strongly recommends the specification of a reference coordinate system. For a meaningful use of data a valid reference coordinate system is imperative, therefore a valid reference coordinate system must be defined for each instance file: |
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− | * A reference coordinate system must be defined as '''three dimensional''' (usually position and height reference system --> [[Definitionen#CCRS|siehe Compound Coordinate Referencesystem]]). | + | * A reference coordinate system must be defined as '''three dimensional''' (usually position and height reference system --> [[Definitionen#CCRS|see Compound Coordinate Reference System]]). |
| * A reference coordinate system should '''not''' be changed within an instance file. | | * A reference coordinate system should '''not''' be changed within an instance file. |
− | * A reference coordinate system should be defined once within ''<gml:Envelope>''. | + | * A reference coordinate system should be defined once within <tt><gml:Envelope></tt>. |
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| '''CityGML Example:''' | | '''CityGML Example:''' |
| | | |
− | ''<gml:boundedBy>
| + | <tt> |
− | | + | <gml:boundedBy> |
− | ''<gml:Envelope srsDimension="3" srsName="'''urn:adv:crs:ETRS89_UTM32*DE_DHHN92_NH'''">''
| + | <gml:Envelope srsDimension="3" srsName="'''urn:adv:crs:ETRS89_UTM32*DE_DHHN92_NH'''"> |
− | | + | '''--> [[Definitionen#Kombi-Lage-Hoehe|see Kombinationen von Lage- und Höhenbezugsystemen in ALKIS]]''' |
− | '''--> [[Definitionen#Kombi-Lage-Hoehe|see Kombinationen von Lage- und Höhenbezugsystemen in ALKIS]]'''
| + | <gml:lowerCorner srsDimension="3">458868.0 5438343.0 112.0 </gml:lowerCorner> |
− | | + | <gml:upperCorner srsDimension="3">458892.0 5438362.0 117.0 </gml:upperCorner> |
− | ''<gml:lowerCorner srsDimension="3">458868.0 5438343.0 112.0 </gml:lowerCorner>''
| + | </gml:Envelope> |
− | | + | </gml:boundedBy> |
− | ''<gml:upperCorner srsDimension="3">458892.0 5438362.0 117.0 </gml:upperCorner>''
| + | </tt> |
− | | |
− | ''</gml:Envelope>''
| |
− | | |
− | ''</gml:boundedBy>''
| |
− | | |
| | | |
| '''ALKIS Example:''' | | '''ALKIS Example:''' |
| | | |
− | ''<gml:boundedBy>''
| + | <tt> |
− | | + | <gml:boundedBy> |
− | ''<gml:Envelope srsName="'''urn:adv:crs:ETRS89_UTM32'''">''
| + | <gml:Envelope srsName="'''urn:adv:crs:ETRS89_UTM32'''"> |
− | | + | <gml:pos>367456.554 5718128.391</gml:pos> |
− | ''<gml:pos>367456.554 5718128.391</gml:pos>''
| + | <gml:pos>367505.094 5718091.143</gml:pos> |
− | | + | </gml:Envelope> |
− | ''<gml:pos>367505.094 5718091.143</gml:pos>''
| + | </gml:boundedBy> |
− | | + | </tt> |
− | ''</gml:Envelope>''
| |
− | | |
− | ''</gml:boundedBy>''
| |
− | | |
| | | |
| see also [[Handbuch für die Modellierung von 3D Objekten - Teil 1: Grundlagen (Regeln für valide GML Geometrie-Elemente in CityGML)#Spatial-Reference-System|Handbuch - Teil 1]] | | see also [[Handbuch für die Modellierung von 3D Objekten - Teil 1: Grundlagen (Regeln für valide GML Geometrie-Elemente in CityGML)#Spatial-Reference-System|Handbuch - Teil 1]] |