Modelling the spatial data of Hellenic Cadastre and generating the geodatabase schema Aris Sismanidis ARISTOTLE UNIVERSITY OF THESSALONIKI FACULTY OF ENGINEERING.

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Presentation transcript:

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

reinforcement of data exchange between land registration systems reduction of the transaction costs increase of the transparency of real.property markets Benefits of modelling the cadastral transactions

salesubdivision 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 Modelling the cadastral transactions of sale and subdivision in Greece

Modelling the cadastral transaction of sale

Modelling the cadastral transaction of subdivision

The Hellenic Cadastral Data Modelling the spatial data of Hellenic Cadastre and generating the geodatabase schema RelationalDatabaseSystem Object Oriented Designing UML XML - XMI GeoDataBase

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

XMI – An important initiative XMI is… XML Metadata Interchange an open standard like UML and XML inspired by Object Management Group’s (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 Modelling the spatial data of Hellenic Cadastre and generating the geodatabase schema

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

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

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