systems / land administration, real estate
valuation and taxation, land re-adjustment, land
consolidation, and expropriation.
Technological aspect: Spatial data infrastructure, geographic information standards, data modeling, knowledge organization systems, semantic web, and linked data.
ISO 19152:2012 LADM based Valuation Information Model
The ISO 19152:2012 Land Administration Domain Model (LADM) presents a conceptual schema for the specification of property units and their legal and geometric characteristics recorded at cadastre and land register, and relates these datasets with other property related datasets (e.g. addresses, utility networks, building (units), valuation, taxation, land use, land cover) recorded at external registrations. A recently initiated colloborative research aims at developing a LADM based international information model for one of these external registrations, namely a Valuation Module for the ISO 19152:2012 LADM. The purpose of this research is to define the semantics of valuation information maintained by public authorities especially for recurrent taxes on immovable property, and to extend the scope of LADM from a fiscal perspective to provide an information model that could be used to construct information systems for immovable property valuation. The preliminary results of this research were presented by Cagdas et al. (2016) at the 11th 3D Geoinfo Conference. This research is carried out within a Joint Working Group which is now being established under FIG Commission 7 (Cadastre and Land Management) and FIG Commission 9 (Valuation and the Management of Real Estate).
A questionnarie is prepared as a part of the methodology, for more information see isoladm.org/ValuationQuestionnaire.
The topic is also on the agenda of LADM 2017 Workshop, Delft, the Netherlands, 16-17 March 2017.
Cadastre and Land Administration Thesaurus – CaLATheThe Cadastre and Land Administration Thesaurus (version 2.0), shortly CaLAThe is a Knowledge Organization System for the domain of cadastre and land administration. It provides a controlled vocabulary, which is derived mainly from the ISO 19152:2012 Land Administration Domain Model and related to existing thesauri, primarily the GEMET thesaurus, the AGROVOC thesaurus, and the STW Thesaurus for Economics. The main purpose is to create a semantic model which may improve organization of knowledge, e.g. in terms of a formal ontology of the domain. The CaLAThe is encoded as a Simple Knowledge Organization System (SKOS), according to specifications developed by the World Wide Web Consortium (W3C). For more information see: cadastralvocabulary.org.
Books / dissertations
A., Cagdas V., 2008. Real
estate valuation. Second edition, Chamber of
Surveying and Cadastre Engineers, Ankara, 486 pages (in Turkish).
Cagdas V., 2007. A model proposal for Turkish real estate taxation system, Ph.D. dissertation, Yildiz TU Institute of Science & Technology, Geomatic Engineering Programme (in Turkish).
ISI journal articles
Stubkjær E., 2015. A SKOS vocabulary for Linked Land
Administration: Cadastre and Land Administration Thesaurus. Land Use
Policy, 49, 668–679.
Yılmaz A., Cagdas V., Demir H., 2015. An evaluation framework for land readjustment practices. Land Use Policy, 44, 153-168.
Cagdas V., Stubkjær E., 2015. Core immovable property vocabulary for European linked land administration. Survey Review, 47(340), 49-60.
Cagdas V., 2013. An Application Domain Extension to CityGML for immovable property taxation: A Turkish case study. International Journal of Applied Earth Observations and Geoinformation, 21(1), 545-555.
Cagdas V., Stubkjær E., 2011. Design research for cadastral systems. Computers, Environment and Urban Systems, 35(1), 77-87.
Cagdas V., Stubkjær E., 2009. Doctoral research on cadastral development. Land Use Policy, 26(4), 869-889.
Other refereed journal articlesKara A., Cagdas V., 2014. An ontology design for Turkish Administrative Unit Gazetteer. Journal of Engineering and Natural Sciences, 32(3), 334-348 (in Turkish).
Cagdas, V., Kara, A., van Oosterom, P., Lemmen, C., Isikdag, U., Kathmann, R., and Stubkjær, E., 2016. An initial design of ISO 19152:2012 LADM based valuation and taxation data model.
ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial
Information Sciences., IV-2/W1, 145-154,
Cagdas V., Gür M., Kurt V., 2003. Property taxation and land management. II. Fédération Internationale des Géomètres (FIG) Regional Congress, Urban-Rural Interrelationship for Sustainable Environment, 02-05 December 2003, Marrakech, Morocco.
Gür M., Cagdas V., Demir H., 2003. Urban-rural interrelationship and issues in Turkey. II. Fédération Internationale des Géomètres (FIG) Regional Congress, Urban-Rural Interrelationship for Sustainable Environment, 02-05 December 2003, Marrakech, Morocco.
Gür M., Cagdas V., Demirel Z., 2003. Land consolidation as a tool of rural sustainable development. II. Fédération Internationale des Géomètres (FIG) Regional Congress, Urban-Rural Interrelationship for Sustainable Environment, 02-05 December 2003, Marrakech, Morocco.
Demir H., Kurt V., Cagdas V., 2003. Housing financing in Turkey. II. Fédération Internationale des Géomètres (FIG) Regional Congress, Urban-Rural Interrelationship for Sustainable Environment, 02-05 December 2003, Marrakech, Morocco.
Cagdas V., Gür M., Demir H., 2002. Concept of ownership in land arrangement studies in Turkey. XXII. Fédération Internationale des Géomètres (FIG) Congress, 19-26 April 2002, Washington DC, USA.
Gür M., Cagdas V., Demir H., 2002. A general overview of real estate valuation applications in Turkey. XXII. Fédération Internationale des Géomètres (FIG) Congress, 19-26 April 2002, Washington DC, USA.
Açlar A., Demirel Z., Demir H., Cagdas V., Gür M., Kurt V., 2003. A system design for real estate valuation. Proceedings of IV. Turkish Scientific and Technical Surveying Congress, 31/03-04/04 2003, Ankara (in Turkish).
Demirel Z., Açlar A., Demir H., Gür M., Kurt V., Cagdas V., 2003. New approaches in land re-allocation. Proceedings of IV. Turkish Scientific and Technical Surveying Congress, 31/03-04/04 2003, Ankara (in Turkish).
Conference presentationsCagdas V., Stubkjær E., 2014. Supplementing INSPIRE through e-Government Core Vocabularies. The 8th INSPIRE Conference, 16-20/06 2014, Aalborg.
Undergraduate levelImmovable property law and Cadastre, 2014 – continues
Graduate levelAdvanced methods in cadastre, 2010 – continues
Public tutorialsLecturer, 2012. Real estate valuation for expropriation, tutorial for geodetic surveyors, organized by HKMO in Istanbul (10/11 2012)
of philosophy, 2001 – 2007. Yildiz
of Science & Technology, Geomatic
Master of science, 1999 – 2001. Yildiz TU, Institute of Science & Technology, Geomatic Engineering Programme
Bachelor degree, 1993 – 1997. Yildiz TU, Department of Surveying Engineering
High school, 1989 – 1992. Kabataş Erkek Lisesi, Beşiktaş
– continues. Yildiz TU, Department of Surveying Engineering
Assistant professor, 2010 – 2014. Yildiz TU, Department of Surveying Engineering
Research assistant, 1998 – 2010. Yildiz TU, Department of Surveying Engineering
Geodetic surveyor, 1997 – 1998. Istanbul-Bakirkoy Municipality, Directorate of Surveying and Expropriation
Geodetic surveyor, 1997 – 1998. Erdem Construction Inc., Construction of Istanbul-Esenyurt Natural Gas-fired Thermal Power Station
researcher, 03/2008 – 12/2008. Cadastral Development
Research Group, Department
of Development and Planning, Aalborg
Ph.D. researcher, 09/2006 – 02/2007. Department of Development and Planning, Aalborg University, and participation to Land Management and Cadastral Development, focusing on Real Estate Taxation supervised by Prof. Dr. Erik Stubkjaer
Participant, 18/08/2008 – 22/08/2008. NordGISci’08 Nordic Summer school in Geographic Information Science, organized at Högskolan I Gävle, Sweden
coordinator, 2012 – continues. Yildiz TU, Office
of International Relations
Departmental coordinator, 2011 – 2014. Yildiz TU, European Union Office
Scientific member, 2010 – continues. Chamber
of Surveying and Cadastre
Engineers (HKMO), Commission on urban and rural land reallotment
Scientific member, 2002 – continues. HKMO, Commission on real estate valuation
Member, 1996 – continues. HKMO
Scholarships and awards
Post-doc scholarship, 2008. The Scientific and Technological
Research Council of Turkey
Erasmus scholarship, 2007. European Union
The best overall presentation, 2002. Paper entitled ‘A General Overview of Real Estate Valuation Applications in Turkey’ at XXII. Fédération Internationale des Géomètres (FIG) Congress, 19-26 April 2002, Washington DC, USA.
Research networksAcademia profile