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264943

The Influence of Flight Height and Overlap on UAV Imagery Over Featureless Surfaces

Article

Last updated: 04 Jan 2025

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Subjects

-

Tags

Civil Engineering

Abstract

The improvement of Unmanned Aerial System (UAS) and photogrammetric computer vision (CV) algorithms have presented an aerial imaging technique for high accuracy and low-cost alternatives for mapping and topographic applications. Structure from motion (SFM) is an automation photogrammetric CV algorithm used for generating 3D colored point clouds and 3D models from overlapping images. One of the biggest problems preventing the automation extraction and matching key points in the aligning aerial images is the featureless surface of the covered area. This paper assessed the effect of flight altitude and overlap ratio on 3D point clouds' geometric accuracy and models produced by Unmanned Aerial Vehicle (UAV) images captured over non-textured sandy areas. Four different flight altitudes (140 m, 160 m, 180 m, and 200m) related to spatial resolution (3.41, 3.9, 4.39, 4.68 cm/pix GSD), respectively and three different overlap levels (60 %, 70 %, and 80 %) were assessed using RGB images captured by UX5 UAV over a non-textured sandy area in Jahra, Kuwait. The results showed that altitude increment might reduce flight time, processing time, and cost with keeping the acceptable and suitable geometric accuracy. The different UAV altitudes 140, 160, 180, and 200 m AGL gave geometric accuracy 0.043, 0.049, 0.052, and 0.057 m for IG process and 0.036, 0.039, 0.048, and 0.053 m for DG process, respectively.  The increasing of image overlap ratio from 60 % to 80 % leads to an increase in photogrammetric point clouds' geometric accuracy from 0.685m to 0.049 m for IG process.  Generally, favorable results are obtained for the four different altitudes and overlap ratios of 80 % at least.

DOI

10.21608/bfemu.2022.264943

Keywords

UAV flight configuration, flight altitude effect, overlap ratio, non-textured surface

Authors

First Name

Ahmed

Last Name

Elhadary

MiddleName

-

Affiliation

Assistant lecturer, Department of Civil Engineering, Benha Faculty of Engineering, Benha University, Egypt

Email

ahmed.elhadari@bhit.bu.edu.eg

City

-

Orcid

-

First Name

Mostafa

Last Name

Rabah

MiddleName

-

Affiliation

Professor of Surveying and Geodesy, Department of Civil Engineering, Benha Faculty of Engineering, Benha University, Egypt

Email

mrabah@bhit.bu.edu.eg

City

-

Orcid

-

First Name

Essam

Last Name

Ghanim

MiddleName

-

Affiliation

Lecturer, Department of Civil Engineering, Benha Faculty of Engineering, Benha University, Egypt

Email

essam.ghanem@bhit.bu.edu.eg

City

Cairo

Orcid

-

First Name

Rasha

Last Name

Mohie

MiddleName

-

Affiliation

Lecturer, Department of Civil Engineering, Benha Faculty of Engineering, Benha University, Egypt

Email

rasha.abdelfattah@bhit.bu.edu.eg

City

-

Orcid

-

First Name

Ahmed

Last Name

Taha

MiddleName

-

Affiliation

Lecturer, Department of Civil Engineering, Benha Faculty of Engineering, Benha University, Egypt

Email

ahmed.soliman@bhit.bu.edu.eg

City

-

Orcid

-

Volume

47

Article Issue

2

Related Issue

32041

Issue Date

2022-04-01

Receive Date

2022-02-01

Publish Date

2022-10-11

Page Start

34

Page End

42

Print ISSN

1110-0923

Online ISSN

2735-4202

Article File

BFEMU_Volume 47_Issue 2_Pages 34-42.pdf

PDF . 1.4MB

Link

https://bfemu.journals.ekb.eg/article_264943.html

Detail API

https://bfemu.journals.ekb.eg/service?article_code=264943

Order

22

Type

Research Studies

Type Code

1,205

Publication Type

Journal

Publication Title

MEJ. Mansoura Engineering Journal

Publication Link

https://bfemu.journals.ekb.eg/

MainTitle

The Influence of Flight Height and Overlap on UAV Imagery Over Featureless Surfaces

Details

Type

Article

Created At

22 Jan 2023