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Assessment of uav-photogrammetric mapping accuracy based on distance variations

Assessment of uav-photogrammetric mapping accuracy based on distance variations / Mohd amiruddin zahari
Projek ini memberi tumpuan untuk mengkaji sifat-sifat geologi struktur batu kapur dan menentukan variasi jarak yang paling berkesan untuk pemetaan UAV. Kawasan kajian terletak di dua (2) kuari yang berbeza iaitu Kuari Hume dan Kuari CIMA. Satu tingkap untuk setiap kuari dengan jarak 10 dan 15 meter. Teknik yang paling biasa digunakan untuk menghasilkan DOM yang sangat terperinci adalah pengimbasan laser dan fotogrametri digital. Fotogrametri digital membolehkan pengambilan data resolusi tinggi dengan kos yang lebih rendah dan mesra pengguna. Dengan menggunakan fotogrametri UAV, jarak yang sesuai untuk setiap data adalah antara 5-15 meter. Kelebihan sistem UAV adalah keupayaannya memberikan maklumat terperinci untuk membolehkan fotogrametri 3D dimodelkan sebagai foto yang mengandungi koordinat yang meningkatkan ketepatan data yang dikumpulkan. Untuk menganalisis kaedah fotogrametri dan memahami kriteria yang diperlukan untuk pemetaan geologi, sebuah UAV digunakan untuk pemetaan geoteknik sementara ‘Agisoft Photoscan’, ‘Discontinuity Set Extractor’ (DSE) dalam perisian ‘MATLAB’ dan ‘CloudCompare’ digunakan untuk menganalisis kaedah fotogrametri sebelum dibandingkan dengan pemetaan manual. Dipercayai bahawa perbezaan dominan bersama dan orientasi yang ditunjukkan dalam kedua-dua kaedah adalah kerana perisian yang digunakan sukar untuk mengesan kerana banyak gangguan. Terdapat beberapa permukaan cerun yang diliputi oleh tanah. Kedua-dua hasil daripada ‘UAVDP’ dan pemetaan manual tidak menunjukkan persepakatan antara satu sama lain. Kesimpulannya, data yang diperolehi dari DSE pada jarak 10 meter lebih tepat daripada 15 meter. _______________________________________________________________________________________________________ This project focus to study the structural geology properties of limestone and to determine the most effective distance variations for UAV mapping. The study area are located at two (2) different quarries which are Hume Quarry and CIMA Quarry. One window for every quarry with difference distances of 10 and 15 meter. The most common technique used to generate highly detailed DOMs are laser scanning and digital photogrammetry. Digital photogrammetry enables high resolution acquisition data with lower cost and more user friendly survey planning. By using UAV photogrammetry, the appropriate distance for every data is between 5-15 meter. The great advantage of actual UAV systems is the ability to provide a detail information to allow 3D photogrammetry to be modelled as the photo contains a coordinate which increase the accuracy for data collected. To analyze the photogrammetry method and to understand the criteria needed for geological mapping, an Unnamed Aerial Vehicle (UAV) was used for geotechnical mapping while Agisoft Photoscan, Discontinuity Set Extractor (DSE) in MATLAB software and CloudCompare were used to analyze the photogrammetry method before compared with manual mapping. It is believed that the difference of dominant joint and orientations shown in both method is due to that the software used difficult to detect the joint because lot of disturbance. There are some slope face that covered by soil. Both result from UAVDP and manual mapping show inagreement with each other. In conclusion, data extracted from DSE at 10 meter distance is more accurate than 15 meter distance. If the distance of drone and quarry face is far, the resolution of images will become lower which can affect the selection of discontinuity joint sets.
Contributor(s):
Mohd Amiruddin Zahari - Author
Primary Item Type:
Final Year Project
Identifiers:
Accession Number : 875008514
Language:
English
Subject Keywords:
geology; limestone; mapping
First presented to the public:
7/1/2019
Original Publication Date:
2/11/2020
Previously Published By:
Universiti Sains Malaysia
Place Of Publication:
School of Materials & Mineral Resources Engineering
Citation:
Extents:
Number of Pages - 93
License Grantor / Date Granted:
  / ( View License )
Date Deposited
2020-02-11 11:46:05.056
Date Last Updated
2020-12-14 13:31:43.406
Submitter:
Mohd Jasnizam Mohd Salleh

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