Abstract

Interest in Unnamed Aerial Vehicle (UAV)-sourced data and Structure-from-Motion (SfM) and Multi-View-Stereo (MVS) photogrammetry has seen a dramatic expansion over the last decade, revolutionizing the fields of aerial remote sensing and mapping. This literature review provides a summary overview on the recent developments and applications of light-weight UA V s and on the widely-accepted SfM - MVS approach. Firstly, the advantages and limitations of UAV remote sensing systems are discussed, followed by an identification of the different UA V and miniaturised sensor models applied to numerous disciplines, showing the range of systems and sensor types utilised recently. Afterwards, a concise list of advantages and challenges of UAV SfM-MVS is provided and discussed. Overall, the accuracy and quality of the SfM-MVS-derived products (e.g. orthomosaics, digital surface model) depends on the quality of the UAV data set, characteristics of the study area and processing tools used. Continued development and investigation are necessary to better determine the quality, precision and accuracy of UAV SfM-MVS derived outputs.

Highlights

  • Over the last decade the emergence of Unnamed Aerial Vehicle (UAV)-acquired observations has considerably contributed to the fields of aerial photogrammetry, remote sensing and mapping

  • Has the UAV technology assisted in collecting data with higher spatio-temporal resolution than before, but it has supported the development of enhanced algorithms for photogrammetric processing and remote sensing analysis, such as the Structure-from-Motion (SfM) and MultiView Stereo (MVS) approach (Remondino et al, 2014)

  • UAV remote sensing platforms have become increasingly easy and fast to deploy on an operational basis

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Summary

INTRODUCTION

Over the last decade the emergence of Unnamed Aerial Vehicle (UAV)-acquired observations has considerably contributed to the fields of aerial photogrammetry, remote sensing and mapping. As a complementary piece of work to previous reviews (Eltner et al, 2016, Fonstad et al, 2013, Manfreda et al, 2018, Colomina and Molina, 2014), the review presented here highlights the benefits and drawbacks of the UAV technology when applied to different photogrammetric and remote sensing applications. It presents the recent developments of various miniature remote sensing sensors as well as discusses the challenges and merits of the widely-accepted SfM-MVS process. This review constitutes an up-to-date, concise summary of the UAV based photogrammetry and remote sensing advances and considerations

UAV PHOTOGRAMMETRY AND REMOTE SENSING APPLICATIONS
Thermal
UAV ADVANCES AND LIMITATIONS
Fixed and rotary-wing UAVs
Consumer and survey-grade UAVs
UAV-BASED SFM-MVS
Typical SfM-MVS process
Advantages and challenges of SfM-MVS process
CONCLUSION
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