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sur le développement des zones arides et semi-arides

Titre : Fit-for-purpose boundary mapping and valuation of agricultural land using UAVs : the case of A1 farms in Zimbabwe.

Auteur : Freeman Ali,

Etablissement de soutenance : University of Twente International Institute for Geo-Information Science and Earth Observation (ITC)

Grade : Master of Science in Geo-Information Science and Earth Observation 2017

Résumé
Recently, the use of Unmanned Aerial Vehicles (UAVs) in the collection of spatial data has increased due to their technological maturation in terms of manoeuvrability, cost and flexibility in geo-data acquisition. Although they have been trialled in cadastral mapping primarily with the view to support land tenure security and the creation of land certificates, in this research their utility for both boundary mapping and valuation of agricultural land was interrogated. Arguably, the large amounts of information provided by UAV imagery provide greater utility for valuation than for cadastral mapping. Consequently, a UAV-based workflow was developed and applied to agricultural land in Zimbabwe, mainly focusing on A1 farms. This involved image acquisition and processing to generate orthophoto used in parcel boundary mapping and describing improvements on land parcel f or valuation purposes . Using the developed UAV-based approach, two orthophotos covering 28.73 ha and 11.59ha for study area in Marondera and Ruwa respectively were generated. The UAV images and the generated orthophotos provided an up-to-date representation of the investigated study areas and produced accurate results when compared to the existing approach. Based on the findings of this study, the developed UAV-based boundary mapping and valuation approach is applicable to agricultural land, particularly A1 farms, in Zimbabwe. The developed approach is useful in both boundary mapping and defining physical characteristics of improvements on land for valuation purposes. Given that the approach was applied on a single farm, further work should explore the use of the developed approach beyond a single farm and compare the results with aerial or satellite photogrammetry in terms of cost and time.

Mots clés : UAVs, Boundary Mapping, UAVs for Valuation, cadastral boundaries, A1 farm surveys, Zimbabwe

Version intégrale (ITC)