Modelling the spatial data of Hellenic Cadastre and generating the geodatabase schema

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ARISTOTLE UNIVERSITY OF THESSALONIKI FACULTY OF
ENGINEERING SCHOOL OF RURAL AND SURVEYING
ENGINEERING DEPARTMENT OF CADASTRE,
PHOTOGRAMMETRY AND CARTOGRAPHY
Modelling the cadastral transactions
of sale and subdivision in Greece
Modelling the spatial data of Hellenic Cadastre
and generating the geodatabase schema
Aris Sismanidis
COST G9 Modelling Real Property
Transactions Working Group no 2, 2nd 3rd
September 2004 in Székesfehérvár, Hungary
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Modelling the cadastral transactions of sale and
subdivision in Greece
Benefits of modelling the cadastral transactions

• reinforcement of data exchange between land
  registration systems
• reduction of the transaction costs
• increase of the transparency of real.property
  markets

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Modelling the cadastral transactions of sale and
subdivision in Greece

• The cases of sale and subdivision are being
  analysed taking into account
• technical
• juridical
• administrative procedures
• from the time that a beneficiary motivates the
  transaction until its completion

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Modelling the cadastral transaction of sale
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Modelling the cadastral transaction of subdivision
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The Hellenic Cadastral Data
Modelling the spatial data of Hellenic Cadastre
and generating the geodatabase schema
XML - XMI
Relational Database System
Object Oriented Designing
GeoDataBase
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XML Introduction
Modelling the spatial data of Hellenic Cadastre
and generating the geodatabase schema

• XML is...
• eXtensible Markup Language
• derived from SGML (Standard Generalized Markup
  Language - ISO 8879)
• an open standard which was approved in February
  1998 from W3C, and includes ISO character sets
• a standard way of representing information in a
  text format (use tags to describe document
  structure and content)
• ideal for use in exchanging data in a standard,
  easy to interpret format
• similar to HTML
• system-independent
• supported from a wide range of software
  developers (IBM, Microsoft, Adobe, Oracle etc)
• defines, validates, and supports the sharing of
  formats in the web

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XMI An important initiative
Modelling the spatial data of Hellenic Cadastre
and generating the geodatabase schema

• XMI is
• XML Metadata Interchange
• an open standard like UML and XML
• inspired by Object Management Groups (OMG)
• uses XML in order to achieve the textual
  representation of UML specifications
• enables the easy interchange of data between
  modeling tools based on UML or other tools

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Generation of the geodatabase
Modelling the spatial data of Hellenic Cadastre
and generating the geodatabase schema
UML, XML, XMI are used in order to approach a
model for the spatial data of the Hellenic
Cadastre and achieve the generation of the
geodatabase in a GIS software.

• The steps for creating the geodatabase were
• Design the object model in static structure UML
  diagram in Ms Visio 2003, using a template
  published by ESRI (ArcInfo UML model)
• Export the model to XML Metadata Interchange
  (XMI), using the XMI Export facility
• Generate and create the geodatabase schema, in
  ArcGis 8.3
• The generation tools translate the UML model
  into an empty geodatabase schema, that is, a set
  of feature classes, tables, relationship classes,
  and rules.

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Conclusions- Benefits of use UML, XML XMI
Modelling the spatial data of Hellenic Cadastre
and generating the geodatabase schema

• UML can be used to capture systems analyses and
  create linguistic data models
• XML is a data interchange format characterized by
  its simplicity, flexibility and extensibility
• XMI is a tool for the transformation of
  object-oriented models into text format. XMI can
  be transformed into implementation specific
  products
• These technologies facilitate the exchange of
  information in an independent manner, allowing
  developers to build, store, and exchange models,
  regardless of using a programming language. In
  other words, they achieve the interoperability
  and the easy interchange of data between
  heterogeneous systems

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Conclusions- Problems
Modelling the spatial data of Hellenic Cadastre
and generating the geodatabase schema

• During the procedure of importing the data model
  in ArcInfo, the model had to be rebuilt in a more
  relational perspective so that the import of the
  model can be applicable, because ArcInfo operates
  in a more relational perspective either than in
  object oriented logic
• Software tools that export in XMI format use
  different versions of XMI, a problem which is
  strengthened by the various versions of UML