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Chryssy Potsiou
School of Rural and Surveying Engineering, National Technical University of Athens, 15780 Athens, Greece

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Journal article
Published: 12 June 2021 in Tourism and Hospitality
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In recent years, the use of crowdsourcing has positively transformed the way geographic information is collected, stored and analyzed. Many countries have promoted and funded research into the potential of using crowdsourcing in various fields of governance. This paper focuses on developing a methodology for fast, low-cost and reliable coastal management for touristic purposes in Greece. In particular, a group of a professional surveyor have developed the methodology and trained two volunteers to collect a variety of data points of interest about a public coastal zone, such as the area size of free and unused public space, rocky areas, parking spaces (organized or not), land use types, build up and green areas, municipal lighting, pedestrian crossing points, beach umbrellas, path routes, street furniture, etc. A pilot case study was compiled for a part of the Athenian Riviera to check the methodology. Derived conclusions point out that the developed methodology may be successfully used for managing the 16,000 km length of the coastal zone of Greece for touristic purposes. Considerations for further improvements to the methodology are given.

ACS Style

Efthimios Bakogiannis; Chryssy Potsiou; Konstantinos Apostolopoulos; Charalampos Kyriakidis. Crowdsourced Geospatial Infrastructure for Coastal Management and Planning for Emerging Post COVID-19 Tourism Demand. Tourism and Hospitality 2021, 2, 261 -276.

AMA Style

Efthimios Bakogiannis, Chryssy Potsiou, Konstantinos Apostolopoulos, Charalampos Kyriakidis. Crowdsourced Geospatial Infrastructure for Coastal Management and Planning for Emerging Post COVID-19 Tourism Demand. Tourism and Hospitality. 2021; 2 (2):261-276.

Chicago/Turabian Style

Efthimios Bakogiannis; Chryssy Potsiou; Konstantinos Apostolopoulos; Charalampos Kyriakidis. 2021. "Crowdsourced Geospatial Infrastructure for Coastal Management and Planning for Emerging Post COVID-19 Tourism Demand." Tourism and Hospitality 2, no. 2: 261-276.

Project report
Published: 25 March 2020 in ISPRS International Journal of Geo-Information
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Greece is one of the few European countries that has not yet a fully operating Cadastre at national coverage. Cadastral surveying and property registration have been completed only for about 8% of the Greek territory, which includes about 18% of the total property rights. At the remaining areas, cadastral surveying and property registration is still under development and is expected to be completed by the end of 2021. The cadastral survey is a participatory procedure in which property right holders, or their representatives, are expected to declare the land parcels on which they have property rights and submit all documents that prove these rights. The time frame available for the declaration is 3 months, which is specific for each municipality. Right holders are now enabled to provide both spatial and descriptive information, regarding their properties and property rights, without the need of a professional. That includes the parcel’s boundary lines along with the legal documents required to validate the declaration. Each right holder, or a representative, has the option to submit a declaration over the internet through a web application without the need of a professional. Within the frame of a PhD research, several concerns were addressed such as usability, security, and scalability in order for the outcome to support its scope while respecting binding constrains. As a result, two web applications have been created to officially support the Hellenic Cadaster property rights declaration process. The suggested approach was considered a big success in terms of both public acceptance and usability as shown from the statistics collected during the first eight months of its formal operation.

ACS Style

George Mourafetis; Chryssy Potsiou. IT Services and Crowdsourcing in Support of the Hellenic Cadastre: Advanced Citizen Participation and Crowdsourcing in the Official Property Registration Process. ISPRS International Journal of Geo-Information 2020, 9, 190 .

AMA Style

George Mourafetis, Chryssy Potsiou. IT Services and Crowdsourcing in Support of the Hellenic Cadastre: Advanced Citizen Participation and Crowdsourcing in the Official Property Registration Process. ISPRS International Journal of Geo-Information. 2020; 9 (4):190.

Chicago/Turabian Style

George Mourafetis; Chryssy Potsiou. 2020. "IT Services and Crowdsourcing in Support of the Hellenic Cadastre: Advanced Citizen Participation and Crowdsourcing in the Official Property Registration Process." ISPRS International Journal of Geo-Information 9, no. 4: 190.

Journal article
Published: 01 February 2020 in ISPRS International Journal of Geo-Information
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This paper is part of a doctoral dissertation (PhD) research that investigates the development of a procedure for reliable 2D crowdsourced cadastral surveying introducing the use of new Information Technology IT tools and increased citizen participation, supported by m-services. For the development of this procedure, the formal cadastral procedure applied currently in two Europeans countries, Greece and Romania, for their modern nation-wide projects is firstly investigated. The first part of this paper briefly investigates the current stage of progress of those projects in both countries, as well as the specifications and procedures applied for the cadastral surveys, and assesses the level of participation of the right holders and the efficiency of the current procedures. Then, a proposal for a crowdsourced general procedure with increased participation of the right holders in the initial cadastral data collection phase is designed that it may be of value either for the planners of those two projects to improve their projects towards a more fit-for-purpose approach and successfully meet the deadlines timely, or for researchers and planners of other projects with similar nation-wide approaches which also require accurate, assured and authoritative end products. For the assessment of the applicability of the proposal, three case studies are held and tested in urban, rural and suburban areas in both countries, using both a commercial application and an open source one. These crowdsourced surveys are compared to the formal cadastral surveys that have been compiled by cadastral professionals in both countries and the achieved results are assessed and judged as satisfactory in terms of geometric accuracies and the avoidance of gross errors in the location of the parcels. A proposal for future research in order to further improve the proposed procedure is discussed.

ACS Style

Chryssy Potsiou; Cornel Paunescu; Charalabos Ioannidis; Konstantinos Apostolopoulos; Florin Nache. Reliable 2D Crowdsourced Cadastral Surveys: Case Studies from Greece and Romania. ISPRS International Journal of Geo-Information 2020, 9, 89 .

AMA Style

Chryssy Potsiou, Cornel Paunescu, Charalabos Ioannidis, Konstantinos Apostolopoulos, Florin Nache. Reliable 2D Crowdsourced Cadastral Surveys: Case Studies from Greece and Romania. ISPRS International Journal of Geo-Information. 2020; 9 (2):89.

Chicago/Turabian Style

Chryssy Potsiou; Cornel Paunescu; Charalabos Ioannidis; Konstantinos Apostolopoulos; Florin Nache. 2020. "Reliable 2D Crowdsourced Cadastral Surveys: Case Studies from Greece and Romania." ISPRS International Journal of Geo-Information 9, no. 2: 89.

Journal article
Published: 20 December 2019 in Land Use Policy
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The development of 3D property registration systems is indispensable for the spatial determination of property Rights, Restrictions and Responsibilities (RRR), the sustainable operation of property markets and the safeguarding of ownership in the highly urbanized world. Several developments in computer graphics, 3D modelling and rendering techniques have attracted the growing global interest in 3D cadastre. Since 2012, the Land Administration Domain Model (LADM ISO 19152) is adopted as the international standard for 2D and 3D cadastral data modelling. Developed legal procedures and prototype systems for 3D property rights registration provide interesting solutions for data acquisition and visualization but such approaches are time and cost demanding. In parallel, 2D cadastral surveying procedures have progressed significantly in reducing required time and cost, utilizing crowdsourcing methodology and mobile services. This paper presents a technical solution under development, aiming to provide the beginning for a new era in the initial acquisition, registration and representation of 3D crowdsourced cadastral data, appropriate for both the developed and the developing world. The proposed solution consists of two complementary parts, the technical framework and the crowdsourced methodology to be followed. The technical framework consists of two interconnected parts, the server-side and the client-side. The server-side refers to the Database Management System (DBMS) where the collected data are stored. The client-side refers to the data capturing tool, which in this case is the mobile device. For the server-side, a prototype system based on model driven architecture practices and LADM is developed; while for the client-side, an open-source mobile application for the acquisition of 3D crowdsourced cadastral data, 3D modelling and visualization of 3D property units as block models (LoD1) on a mobile’s phone screen in real-time, is developed. This research is focused on investigating technical aspects for capturing and integrating data about legal rights on physical objects. Detailed investigation of legal issues is not within the objectives of this research. Two case-studies for testing the proposed technical solution are made. An assessment of the current stage of development of the technical solution is presented. The main conclusions converge that the proposed technical solution has huge potentials for the fast, economic implementation of 3D cadastral surveys as it can produce an accurate and reliable 3D information model, depending on the accuracy of the available basemaps. The developed application is easy-to-use as users may not have the necessary level of 3D modelling skills in order to contribute to the registration procedure.

ACS Style

Maria Gkeli; Chryssy Potsiou; Charalabos Ioannidis. A technical solution for 3D crowdsourced cadastral surveys. Land Use Policy 2019, 98, 104419 .

AMA Style

Maria Gkeli, Chryssy Potsiou, Charalabos Ioannidis. A technical solution for 3D crowdsourced cadastral surveys. Land Use Policy. 2019; 98 ():104419.

Chicago/Turabian Style

Maria Gkeli; Chryssy Potsiou; Charalabos Ioannidis. 2019. "A technical solution for 3D crowdsourced cadastral surveys." Land Use Policy 98, no. : 104419.

Journal article
Published: 15 November 2016 in Survey Review
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ACS Style

K. Apostolopoulos; M. Geli; P. Petrelli; C. Potsiou; C. Ioannidis. A new model for cadastral surveying using crowdsourcing. Survey Review 2016, 50, 122 -133.

AMA Style

K. Apostolopoulos, M. Geli, P. Petrelli, C. Potsiou, C. Ioannidis. A new model for cadastral surveying using crowdsourcing. Survey Review. 2016; 50 (359):122-133.

Chicago/Turabian Style

K. Apostolopoulos; M. Geli; P. Petrelli; C. Potsiou; C. Ioannidis. 2016. "A new model for cadastral surveying using crowdsourcing." Survey Review 50, no. 359: 122-133.

Journal article
Published: 07 June 2016 in The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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The complexity of modern urban environments and civil demands for fast, reliable and affordable decision-making requires not only a 3D Land Information System, which tends to replace traditional 2D LIS architectures, but also the need to address the time and scale parameters, that is, the 3D geometry of buildings in various time instances (4th dimension) at various levels of detail (LoDs - 5th dimension). This paper describes and proposes solutions for technical aspects that need to be addressed for the 5D modelling pipeline. Such solutions include the creation of a 3D model, the application of a selective modelling procedure between various time instances and at various LoDs, enriched with cadastral and other spatial data, and a procedural modelling approach for the representation of the inner parts of the buildings. The methodology is based on automatic change detection algorithms for spatial-temporal analysis of the changes that took place in subsequent time periods, using dense image matching and structure from motion algorithms. The selective modelling approach allows a detailed modelling only for the areas where spatial changes are detected. The procedural modelling techniques use programming languages for the textual semantic description of a building; they require the modeller to describe its part-to-whole relationships. Finally, a 5D viewer is developed, in order to tackle existing limitations that accompany the use of global systems, such as the Google Earth or the Google Maps, as visualization software. An application based on the proposed methodology in an urban area is presented and it provides satisfactory results.

ACS Style

Charalabos Ioannidis; Chryssy Potsiou; Sofia Soile; Styliani Verykokou; George Mourafetis; Nikolaos Doulamis. TECHNICAL ASPECTS FOR THE CREATION OF A MULTI-DIMENSIONAL LAND INFORMATION SYSTEM. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences 2016, XLI-B2, 115 -122.

AMA Style

Charalabos Ioannidis, Chryssy Potsiou, Sofia Soile, Styliani Verykokou, George Mourafetis, Nikolaos Doulamis. TECHNICAL ASPECTS FOR THE CREATION OF A MULTI-DIMENSIONAL LAND INFORMATION SYSTEM. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. 2016; XLI-B2 ():115-122.

Chicago/Turabian Style

Charalabos Ioannidis; Chryssy Potsiou; Sofia Soile; Styliani Verykokou; George Mourafetis; Nikolaos Doulamis. 2016. "TECHNICAL ASPECTS FOR THE CREATION OF A MULTI-DIMENSIONAL LAND INFORMATION SYSTEM." The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B2, no. : 115-122.

Research article
Published: 16 September 2015 in Survey Review
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While some countries have over centuries developed a nation-wide spatial framework, some others have been left behind. However, because of the global economic and social challenges, there is an urgent need for those countries to develop similar systems in a fast and efficient way for their economic survival. Building such a framework should be always based on each country's resources and capacities. In systematic cadastral registrations, the participation of owners has always been crucial for the success of the project. Within this concept, the authors investigate the potential of new tools to increase the participation of land right holders and local volunteers (non-professionals) and to enhance the cadastral surveying procedure. A hybrid “crowdsourcing” approach is proposed, mainly based on the direct participation of property rights holders in which the role of the cadastral surveyor is crucial. A commercial application for smartphones is tested. The smartphone's GPS is used only for the general positioning on the basemap to avoid gross errors when owners are not accustomed in using aerial photos. A recent orthoimage of 20 cm pixel size in urban areas and an orthoimage basemap of 50 cm pixel size in rural areas is used as the basemap. Once roughly positioned, owners may then digitise the boundary coordinates on the basemap off-line, with little training support; they may also work from a distance. In areas where the property boundaries are easily recognised on the basemap, boundary coordinates have the expected geometric accuracy that can be achieved on the basemap while no gross errors are detected. Attachment of photos is also possible (e.g. photos of the property or of the deeds). Restricted access to personal data may also be achieved. The method is also useful for cadastre updating purposes (e.g. the periodic updating of buildings database).

ACS Style

G. Mourafetis; K. Apostolopoulos; C. Potsiou; C. Ioannidis. Enhancing cadastral surveys by facilitating the participation of owners. Survey Review 2015, 47, 316 -324.

AMA Style

G. Mourafetis, K. Apostolopoulos, C. Potsiou, C. Ioannidis. Enhancing cadastral surveys by facilitating the participation of owners. Survey Review. 2015; 47 (344):316-324.

Chicago/Turabian Style

G. Mourafetis; K. Apostolopoulos; C. Potsiou; C. Ioannidis. 2015. "Enhancing cadastral surveys by facilitating the participation of owners." Survey Review 47, no. 344: 316-324.

Journal article
Published: 11 August 2015 in ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Outdoor large-scale cultural sites are mostly sensitive to environmental, natural and human made factors, implying an imminent need for a spatio-temporal assessment to identify regions of potential cultural interest (material degradation, structuring, conservation). On the other hand, in Cultural Heritage research quite different actors are involved (archaeologists, curators, conservators, simple users) each of diverse needs. All these statements advocate that a 5D modelling (3D geometry plus time plus levels of details) is ideally required for preservation and assessment of outdoor large scale cultural sites, which is currently implemented as a simple aggregation of 3D digital models at different time and levels of details. The main bottleneck of such an approach is its complexity, making 5D modelling impossible to be validated in real life conditions. In this paper, a cost effective and affordable framework for 5D modelling is proposed based on a spatial-temporal dependent aggregation of 3D digital models, by incorporating a predictive assessment procedure to indicate which regions (surfaces) of an object should be reconstructed at higher levels of details at next time instances and which at lower ones. In this way, dynamic change history maps are created, indicating spatial probabilities of regions needed further 3D modelling at forthcoming instances. Using these maps, predictive assessment can be made, that is, to localize surfaces within the objects where a high accuracy reconstruction process needs to be activated at the forthcoming time instances. The proposed 5D Digital Cultural Heritage Model (5D-DCHM) is implemented using open interoperable standards based on the CityGML framework, which also allows the description of additional semantic metadata information. Visualization aspects are also supported to allow easy manipulation, interaction and representation of the 5D-DCHM geometry and the respective semantic information. The open source 3DCityDB incorporating a PostgreSQL geo-database is used to manage and manipulate 3D data and their semantics.

ACS Style

A. Doulamis; C. Ioannidis; C. Chrysouli; N. Grammalidis; K. Dimitropoulos; C. Potsiou; E.-K. Stathopoulou; M. Ioannides. 5D Modelling: An Efficient Approach for Creating Spatiotemporal Predictive 3D Maps of Large-Scale Cultural Resources. ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences 2015, II-5/W3, 61 -68.

AMA Style

A. Doulamis, C. Ioannidis, C. Chrysouli, N. Grammalidis, K. Dimitropoulos, C. Potsiou, E.-K. Stathopoulou, M. Ioannides. 5D Modelling: An Efficient Approach for Creating Spatiotemporal Predictive 3D Maps of Large-Scale Cultural Resources. ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences. 2015; II-5/W3 ():61-68.

Chicago/Turabian Style

A. Doulamis; C. Ioannidis; C. Chrysouli; N. Grammalidis; K. Dimitropoulos; C. Potsiou; E.-K. Stathopoulou; M. Ioannides. 2015. "5D Modelling: An Efficient Approach for Creating Spatiotemporal Predictive 3D Maps of Large-Scale Cultural Resources." ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences II-5/W3, no. : 61-68.

Journal article
Published: 01 November 2013 in Survey Review
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ACS Style

K. Spirou-Sioula; C. Ioannidis; C. Potsiou. Technical aspects for 3D hybrid cadastral model. Survey Review 2013, 45, 419 -427.

AMA Style

K. Spirou-Sioula, C. Ioannidis, C. Potsiou. Technical aspects for 3D hybrid cadastral model. Survey Review. 2013; 45 (333):419-427.

Chicago/Turabian Style

K. Spirou-Sioula; C. Ioannidis; C. Potsiou. 2013. "Technical aspects for 3D hybrid cadastral model." Survey Review 45, no. 333: 419-427.