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Integration und Visualisierung von 2D- und 3D-Geodaten in einem verteilten GIS am Beispiel virtueller Stadttouren

Integration und Visualisierung von 2D- und 3D-Geodaten in einem verteilten GIS am Beispiel virtueller Stadttouren

          
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About the Book

Inhaltsangabe: Einleitung: Mittlerweile stehen zahlreiche Geodaten in digitaler Form zur Verfügung. Darunter Karten, Digitale Geländemodelle, Virtual Reality Modelle von Gebäuden usw. Diese liegen jedoch in unterschiedlichen Formaten vor oder sind verschieden georeferenziert. Die zunehmend automatisierte großflächige Erfassung von 3D-Stadtmodellen liefert Datenbestände für den Aufbau von echten 3D-Geoinformationssystemen. Flächendeckend sind jedoch meist nur 2D-Geodaten vorhanden. Daher besteht verstärkt die Notwendigkeit, 2D- und 3D-Geodaten zu integrieren und für eine gemeinsame 3Dvisualisierung zu nutzen. Die vorliegende Arbeit zeigt Konzepte und Methoden der Integration sowohl von Objekten als auch von Digitalen Geländemodellen (DGM) auf. Als Anwendung wird ein Virtual Reality Server beschrieben, der als Java-Paket realisiert wurde und der aus heterogenen Geodatenquellen eine gemeinsame 3D-Visualisierung generiert, die über das Internet zugänglich ist. Als Datenkomponente wurde ein eigenes Modell entwickelt, das mit multidimensionalen, hybriden (aus Geodatenservern, VRML u.a. entnommenen) Geodaten umgehen kann und das mehrere Levels-of-Detail unterstützt. Das DGM wird in Form mehrerer Punktmengen in einer räumlichen Datenbank gespeichert und bei Anfragen dynamisch erzeugt, indem die Auflösung an den Standort des Benutzers angepasst wird. Ein Schwerpunkt liegt auf der Verschneidung von Geodaten. Es werden zwei verschiedene Ansätze vorgestellt. Bei der bevorzugten automatischen Verschneidung werden die Geodaten allein anhand ihrer räumlichen Beziehungen zueinander zusammengeführt. Um 2D-Geometrien in 3D-Szenen einzubinden, werden diese auf das DGM gelegt und evtl. extrudiert. Auf diese Weise werden z.B. aus Gebäudegrundrissen Blockmodelle erstellt und gemeinsam mit echten 3D-Modellen visualisiert. Die Visualisierung erfolgt objekttypenspezifisch. So können z.B. Bäume als Punkte gespeichert und bei der Generierung von 3D-Szenen durch komplexere Objekte ersetzt


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Product Details
  • ISBN-13: 9783838653990
  • Publisher: Diplom.de
  • Binding: Paperback
  • Language: German
  • Returnable: N
  • Spine Width: 7 mm
  • Width: 148 mm
  • ISBN-10: 3838653998
  • Publisher Date: 07 May 2002
  • Height: 210 mm
  • No of Pages: 112
  • Series Title: German
  • Weight: 159 gr


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Integration und Visualisierung von 2D- und 3D-Geodaten in einem verteilten GIS am Beispiel virtueller Stadttouren
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