Traditionally, data co-registration of survey epochs in photogrammetry relied on Ground Control Points (GCP) to keep the reference system unchanged. In the last years, Unmanned Aerial Systems (UAV) are increasingly used in photogrammetric environmental monitoring. The diffusion of affordable UAV platforms equipped with GNSS (Global Navigation Satellite System) centimetre-grade receivers might reduce, but not eliminate, the need for GCP. Conversely, if GNSS-assisted orientation cannot be used or if additional ground control and reliability checks are required, alternatives to repeated GCP survey have been proposed, taking advantage of Structure from Motion (SfM) photogrammetry. In particular, co-registering different epochs image blocks together, identifying corresponding features, has been demonstrated as a viable and efficient approach. In this paper four different strategies easily implementable in a generic commercial photogrammetric software are presented and compared considering three different test sites in Italy subject to different amounts of environmental changes. The influence of the amount and distribution of inter-epoch corresponding points on the accuracy of the reconstruction is investigated. The results show that some of the tested strategies obtains very good results and can be used (although not needed) also in RTK centimetre-grade UAV surveys, leveraging the additional information coming from previous epochs survey to actually increase the survey accuracy and reliability.

Multi-Temporal Image Co-Registration Of Uav Blocks: A Comparison Of Different Approaches / Garieri, P.; Riboloni, M.; Forlani, G.; Roncella, R.. - In: INTERNATIONAL ARCHIVES OF THE PHOTOGRAMMETRY, REMOTE SENSING AND SPATIAL INFORMATION SCIENCES. - ISSN 1682-1750. - 43:(2021), pp. 9-16. ((Intervento presentato al convegno 2021 24th ISPRS Congress Commission II: Imaging Today, Foreseeing Tomorrow tenutosi a fra nel 2021 [10.5194/isprs-archives-XLIII-B2-2021-9-2021].

Multi-Temporal Image Co-Registration Of Uav Blocks: A Comparison Of Different Approaches

Garieri P.;Riboloni M.;Forlani G.;Roncella R.
2021

Abstract

Traditionally, data co-registration of survey epochs in photogrammetry relied on Ground Control Points (GCP) to keep the reference system unchanged. In the last years, Unmanned Aerial Systems (UAV) are increasingly used in photogrammetric environmental monitoring. The diffusion of affordable UAV platforms equipped with GNSS (Global Navigation Satellite System) centimetre-grade receivers might reduce, but not eliminate, the need for GCP. Conversely, if GNSS-assisted orientation cannot be used or if additional ground control and reliability checks are required, alternatives to repeated GCP survey have been proposed, taking advantage of Structure from Motion (SfM) photogrammetry. In particular, co-registering different epochs image blocks together, identifying corresponding features, has been demonstrated as a viable and efficient approach. In this paper four different strategies easily implementable in a generic commercial photogrammetric software are presented and compared considering three different test sites in Italy subject to different amounts of environmental changes. The influence of the amount and distribution of inter-epoch corresponding points on the accuracy of the reconstruction is investigated. The results show that some of the tested strategies obtains very good results and can be used (although not needed) also in RTK centimetre-grade UAV surveys, leveraging the additional information coming from previous epochs survey to actually increase the survey accuracy and reliability.
Multi-Temporal Image Co-Registration Of Uav Blocks: A Comparison Of Different Approaches / Garieri, P.; Riboloni, M.; Forlani, G.; Roncella, R.. - In: INTERNATIONAL ARCHIVES OF THE PHOTOGRAMMETRY, REMOTE SENSING AND SPATIAL INFORMATION SCIENCES. - ISSN 1682-1750. - 43:(2021), pp. 9-16. ((Intervento presentato al convegno 2021 24th ISPRS Congress Commission II: Imaging Today, Foreseeing Tomorrow tenutosi a fra nel 2021 [10.5194/isprs-archives-XLIII-B2-2021-9-2021].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11381/2902515
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