Influence of the shape and size of the ground targets on the accuracy of photogrammetric processing

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Abstract

The materials obtained from the unmanned aerial vehicle (UAV) are used to solve many problems, including large-scale mapping and monitoring of linear objects, as well as the ecological situation and monitoring of emergency situations. The promptly obtained photographic materials make it possible to reveal the consequences of man-made human impact associated with degradation of the soil cover, flooding of lands, salinization and pollution of the soil layer, and changes in the vegetation cover. Control points are used for absolute orientation of the generated models in the most projects of photogrammetric processing of aerial photos and images obtained from UAVs. In areas with low contour, before aerial survey, targeting is carried out in the required zones. The research is devoted to the study of the influence of the shape of ground targets on the accuracy of photogrammetric processing. It involved three different types of ground targets located on the land cover along the survey path at a distance not exceeding 1 m from each other. The targets were used as ground control points in the photogrammetric processing of the materials from the UAV. Two three-stripe photographic surveys of the 900 m long track were carried out: with UAV DJI PHANTOM 4 PRO camera FC6310 at a scale of 1:3400 and ground resolution of 1 cm and with the DJI Mavic PRO UAV camera FC220 at a scale of 1:12 700 and ground resolution of 2 cm. In both cases, the direction of flight is north - south, 36 targets were included in the photogrammetric processing. In the first case, 502 images were processed, in the second - 152. The photogrammetric processing for the orthophoto mosaic generation was carried out using the Agisoft Photo Scan Professional software. Four different contrasting sites in the study area were selected for the study: green grass, dry grass, clay, sand. Accuracy was assessed according to two criteria: 1) the degree of visualization of the target on the images; 2) the accuracy of the orthophoto mosaic, generated using various targets.

About the authors

Amr Elsheshtawy

Al-Azhar University; State University of Land Use Planning

Author for correspondence.
Email: amrshesht82@gmail.com

PhD student at the Department of Remote Sensing and Digital Cartography of the State University of Land Use Planning; teacher of the Civil Engineering Department of the Faculty of Engineering in Cairo of the Al-Azhar University

15 Mohammed Abdou St, El-Darb El-Ahmar, Cairo Governorate, Arab Republic of Egypt; 15 Kazakova St., Moscow, 105064, Russian Federation

Larisa A. Gavrilova

State University of Land Use Planning

Email: gavrilova.a.larisa@gmail.com

Candidate of Technical Sciences, Associate Professor, Dean of the Faculty of Urban Cadaster

15 Kazakova St., Moscow, 105064, Russian Federation

Anatoly N. Limonov

State University of Land Use Planning

Email: limonov.anatoly@gmail.com

Candidate of Technical Sciences, Associate Professor, Professor of the Department of Remote Sensing and Digital Cartography

15 Kazakova St., Moscow, 105064, Russian Federation

Mohamed Elshewy

Al-Azhar University; State University of Land Use Planning

Email: mimoelshewy@gmail.com

PhD student at the Department of Geodesy and Geoinformatics of the State University of Land Use Planning; teacher of the Civil Engineering Department of the Faculty of Engineering in Cairo of the Al-Azhar University.

15 Mohammed Abdou St, El-Darb El-Ahmar, Cairo Governorate, Arab Republic of Egypt; 15 Kazakova St., Moscow, 105064, Russian Federation

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Copyright (c) 2020 Elsheshtawy A., Gavrilova L.A., Limonov A.N., Elshewy M.

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