Remote Sensing and GIS Applications in Environmental Sciences

The effect of ground control point network architecture and distribution on the accuracy of UAV image maps.

Document Type : Original Article

Authors

1 Surveying department, Marand Technical and Engineering Faculty, University of Tabriz, Tabriz, Iran.

2 Department of Geomatics, School of Marand Engineering, University of Tabriz,

10.22034/rsgi.2024.58645.1056

Abstract

Understanding the impact of unmanned aerial vehicle (UAV) photogrammetric network design parameters on 3D reconstruction quality is crucial for achieving optimal spatial information production from UAV images in a UAV-based project, considering existing conditions and limitations. The purpose of this research is to assess the impact of ground control point network architecture and distribution on the accuracy of spatial information and maps generated from drone images. The design and distribution of the ground control point network have been examined in two modes and three distinct scenarios for this aim. Control points ranging from 4 to 42 points were designed just in the side models in the first case (A) and both around and in the center position of the photogrammetry block in the second case (B). According to the data, mode B had the highest measurement accuracy in both urban and non-urban regions, as well as the best results and the least error in each of those scenarios. The findings showed that the average accuracy loss in UAV-based outputs in the first scenario is at least 12% in the arrangement of A and B control points. Furthermore, the accuracy loss in the second and third scenarios is at least 0.59% and 0.53%, respectively, when compared to the first scenario. In general, it is not suggested to construct and expand control point distances more than 30 times GSD, and if these distances are exceeded, control points must be designed in central block models.

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Main Subjects

آگاهی از رفتار و تأثیر پارامترهای طراحی شبکه نقاط کنترل پهپادمبنا بر روی کیفیت بازسازی سه‌بعدی برای دستیابی به کیفیتی بهینه در تولید اطلاعات مکانی،  یکی از بخش‌­های مهم در اجرای یک پروژه پهپادمبنا با توجه به شرایط و محدودیت‌های موجود می‌باشد. هدف این تحقیق ارزیابی تاثیر طراحی  و توزیع شبکه نقاط کنترل زمینی در دقت تولید اطلاعات مکانی و نقشه­های تولیدی از تصاویر پهپادی است. برای این منظور، در این تحقیق، طراحی  و توزیع شبکه نقاط کنترل زمینی در دو حالت و سه سناریوی مختلف مورد ارزیابی قرار گرفتند. حالت اول (A) نقاط کنترل از 4 تا 42  نقطه، فقط در مدلهای کناری  و در حالت دوم (B) هم در اطراف و هم در محل مرکزی بلوک فتوگرامتری طراحی شدند. نتایج نشان داد حالت B بالاترین دقت اندازه­گیری را در مناطق شهری و غیرشهری به دست آورد و بهترین نتایج و کمترین خطا را در هر سه سناریو داشت. یافته­ها نشان داد که در سناریوی اول متوسط افت دقت در خروجی­های پهپادمبنا حداقل تا 12 درصد در پیکربندی A و B نقاط کنترل حاصل می­گردد. همچنین، این افت دقت در سناریوی دوم  و سوم به ترتیب حداقل تا 59/0 درصد و 53/0 درصد را نسبت به سناریوی اول نشان می­دهند. بطور کلی، طراحی و گسترش فواصل نقطه کنترل بیش از 30 برابر GSD توصیه نمی­گردد و در صورت افزایش فواصل آنها به بیش از این مقدار، طراحی بیشتر نقاط کنترل در مدل­های مرکزی بلوک ضروری است.

 Aktan, N., Çolak, A. and Yılmaz, H.M., 2022. Production of orthophoto by UAV data: Yaprakhisar example. Advanced UAV, 2(1): 17-23.
Elkhrachy, I.J.A.E.J., 2021. Accuracy assessment of low-cost Unmanned Aerial Vehicle (UAV) photogrammetry. Alexandria Engineering Journal, 60(6): 5579-5590.
Erenoglu, R.C., Erenoglu, O. and Arslan, N., 2018. Accuracy assessment of low cost UAV based city modelling for urban planning. Tehnički vjesnik, 25(6): 1708-1714.
Fazeli, H., Samadzadegan, F. and Dadrasjavan, F., 2016. Evaluating the potential of RTK-UAV for automatic point cloud generation in 3D rapid mapping. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 41: 221-226.
Ismael, R.Q. and Henari, Q.Z., 2019. Accuracy assessment of UAV photogrammetry for large scale topographic mapping, 2019 International Engineering Conference (IEC). IEEE, pp. 1-5.
James, M.R., Robson, S., d'Oleire-Oltmanns, S. and Niethammer, U.J.G., 2017. Optimising UAV topographic surveys processed with structure-from-motion: Ground control quality, quantity and bundle adjustment. Geomorphology, 280: 51-66.
Karataş, K. and ALTINIŞIK, N.S., 2020. The effect of uav usage on detail points in cadastre update studies: Corum-karaköy case study. International journal of environment and geoinformatics, 7(2): 140-146.
Liu, X., Lian, X., Yang, W., Wang, F., Han, Y. and Zhang, Y.J.D., 2022. Accuracy assessment of a UAV direct georeferencing method and impact of the configuration of ground control points. Drones, 6: 30 (2).
Nagendran, S.K., Tung, W.Y. and Ismail, M.A.M., 2018. Accuracy assessment on low altitude UAV-borne photogrammetry outputs influenced by ground control point at different altitude, IOP Conference Series: Earth and Environmental Science. IOP Publishing, pp. 012031.
Nwilag, B.D., Eyoh, A.E. and Ndehedehe, C.E., 2023. Digital topographic mapping and modelling using low altitude unmanned aerial vehicle. Modeling Earth Systems and Environment, 9(2): 1463-1476.
Pandjaitan, N.H., Rau, M.I., Febrita, J., Dharmawan, I. and Akhmat, I., 2019. Comparison between DSM and DTM from photogrammetric UAV in Ngantru Hemlet, Sekaran Village, Bojonegoro East Java, Sixth international symposium on LAPAN-IPB satellite. SPIE, pp. 678-683.
Rokhmana, C.A. and Utomo, S., 2016. The low-cost UAV-based remote sensing system capabilities for large scale cadaster mapping, IOP Conference Series: Earth and Environmental Science. IOP Publishing, pp. 012005.
Varbla, S., Puust, R. and Ellmann, A.J.S.r., 2021. Accuracy assessment of RTK-GNSS equipped UAV conducted as-built surveys for construction site modelling. Survey review, 53(381): 477-492.
Remote Sensing and GIS Applications in Environmental Sciences
Volume 3, Issue 7 - Serial Number 6
July 2023
Pages 97-77
  • Receive Date: 28 September 2022
  • Revise Date: 12 October 2023
  • Accept Date: 03 November 2023