2022 |
Apostolopoulos, Konstantinos; Potsiou, Chryssy How to Improve Quality of Crowdsourced Cadastral Surveys Journal Article In: Land, vol. 11, no. 10, pp. 1642, 2022, ISSN: 2073-445X. Abstract | Links | BibTeX | Tags: cadastral basemap, Cadastre, Crowdsourcing, Land administration, quality controls @article{apostolopoulos2022improve,The potential for introducing voluntary citizen participation, combined with mobile services, for cadastral data collection for a systematic first registration has been thoroughly investigated and even implemented in some official projects. This data collection procedure can technically be ac-complished safely, but results have shown that many participants have difficulty in identifying the land parcels (location, shape and size) on the base-map (orthophoto, air-photo, etc.) correctly. Either they have to ask the assistance of a private professional, or there is a high risk that a number of errors may appear in the submitted crowdsourced data. This paper investigates how to improve the quality of such crowdsourced cadastral data, by adding to the base-map any available and relevant geospatial and descriptive information that may help the participants to correctly identify their land parcel. In particular, the research investigates and suggests (a) which types of available geospatial information should be added to the base-map and by whom (professionals or a group of trained volunteers), and (b) the necessary quality controls that must be made in the compilation of the advanced crowdsourced base-map—a case study follows to assess the suggested proposal. In addition, this paper provides an updated version of the crowdsourced methodology for cadastral surveys as modelled by the authors in an earlier stage of their research. This updated version briefly includes all quality controls needed to ensure the quality of a modern cadastre that the authors will further investigate in a subsequent stage. |
2021 |
Nystrom, Steven; Potsiou, C; Salize, M.; Wouters, R. Post COVID-19 Recovery in Informal Settlements Proceedings Article In: pp. 21-25, FIG WW2021, 2021. Abstract | Links | BibTeX | Tags: Affordable housing, Cadastre, Geoinformation/GI, Informal settlements, Spatial planning @inproceedings{Nystrom2021,In the UNECE region there are approximately 50 million people living in informal settlements, with a large percentage of them in Southern and Eastern parts. These settlements typically have dense populations, limited services, including water supply and sanitation, inadequate transport, unregistered residents, inadequate housing with insecure tenure, and unregistered land rights. A plan to address the specific challenges of COVID-19 within informal settlements is urgently needed, while also addressing the achievement of the Sustainable Development Goals (SDGs). This Recovery Action Plan provides an extensive list of Goals, Targets, and Actions that can be advanced by governments, local authorities, residents, community leaders, non-governmental organizations, and other stakeholders to help mitigate and/or prevent the COVID-19 pandemic spread. It is also designed to help build back better to achieve greater resilience against future pandemic risks while simultaneously helping to achieve the Goals of the 2030 Agenda for Sustainable Development, with a particular focus on SDG 11 on sustainable cities and human settlements. The format of the action plan is built around 9 broad Policy Areas, and each of these will begin with a main Goal for that Policy Area. Under each Goal there will be a number of Targets. These are essentially secondary goals, under the main one. Each Target includes a number of individual Actions to help achieve these Targets. The integration of informal constructions within the formal markets, legal framework, land planning, and appropriate administrative adaptation will help achieve resilience and the SDGs. Buildings registers and the address register data were among the most useful datasets during the COVID-19 pandemic. It is important each building to be included in the building register, no matter if it is registered or not in the cadaster for risk analysis and response. The Recovery Action Plan for informal settlements and the work at community level should also be envisioned in parallel with other urban and rural community development needs and activities. In rural areas a focus on safe and sustainable agriculture and rural development and diversification of the rural economy should incorporate the concepts discussed herein. |
2020 |
Potsiou, Chryssy; Paunescu, Cornel; Ioannidis, Charalabos; Apostolopoulos, Konstantinos; Nache, Florin Reliable 2D Crowdsourced Cadastral Surveys: Case Studies from Greece and Romania Journal Article In: ISPRS Int. J. Geo-Information, vol. 9, no. 2, pp. 89, 2020, ISSN: 2220-9964. Abstract | Links | BibTeX | Tags: Cadastre, Crowdsourcing, Land administration, opensource @article{Potsiou2020,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. |
2018 |
Apostolopoulos, K; Geli, M; Petrelli, P; Potsiou, C; Ioannidis, C A new model for cadastral surveying using crowdsourcing Journal Article In: Surv. Rev., vol. 50, no. 359, pp. 122–133, 2018, ISSN: 17522706. Abstract | Links | BibTeX | Tags: Cadastre, Crowdsourcing, Gamification, Mobile device, VGI @article{Apostolopoulos2018,A ‘fit-for-purpose' approach is developed, tested and presented for cadastral surveys through increased owners' participation using new technology and m-government services. Three case studies are reported, for urban, suburban and rural areas, with a combined use of two mobile applications: a commercial software package (ESRI's Collector for ArcGIS) and an opensource self-developed application named BoundGeometry. The parameters of time, quality and accuracy are assessed and the identified difficulties are classified. It is concluded that the method is applicable both in developed and developing countries, and each time adjustable to the available infrastructure. |
2022 |
How to Improve Quality of Crowdsourced Cadastral Surveys Journal Article In: Land, vol. 11, no. 10, pp. 1642, 2022, ISSN: 2073-445X. |
2021 |
Post COVID-19 Recovery in Informal Settlements Proceedings Article In: pp. 21-25, FIG WW2021, 2021. |
2020 |
Reliable 2D Crowdsourced Cadastral Surveys: Case Studies from Greece and Romania Journal Article In: ISPRS Int. J. Geo-Information, vol. 9, no. 2, pp. 89, 2020, ISSN: 2220-9964. |
2018 |
A new model for cadastral surveying using crowdsourcing Journal Article In: Surv. Rev., vol. 50, no. 359, pp. 122–133, 2018, ISSN: 17522706. |