Generation and Comparison of Orthophotos and 3D models of Small-scale Terraced Topography using Vertical and High Oblique Images Taken by UAV

2018 ◽  
Vol 26 (3) ◽  
pp. 23-30
Author(s):  
Ki Rim Lee ◽  
You Kyung Han ◽  
Won Hee Lee
Keyword(s):  
3D Models ◽  
Small Scale ◽  
Oblique Images

scholarly journals A COMPARISON BETWEEN TLS AND UAV TECHNOLOGIES FOR HISTORICAL INVESTIGATION

2019 ◽  
Vol XLII-2/W9 ◽  
pp. 739-745 ◽  
Author(s):  
R. Valenti ◽  
E. Paternò
Keyword(s):  
3D Models ◽  
Geometric Interpretation ◽  
Point Of View ◽  
Innovative Technology ◽  
Mathematical Representation ◽  
Small Scale ◽  
3D Objects ◽  
Historical Investigation ◽  
3D Processing ◽  
Object Of Study

<p><strong>Abstract.</strong> The architectural and sculptural value of the investigated Cultural Heritage has suggested a variety of possible approaches ranging from the traditional modus operandi to the implementation of innovative technology. The conducted research implemented digital and automatic photogrammetry software using Structure from Motion or SFM. These techniques which involve the convergence of different disciplines, such as Computer Vision and photogrammetry seek to generate 3D models, that is the mathematical representation of the investigated 3D objects. The integration of UAS, photogrammetry and TLS develops 3D models able to provide more detailed information. The main purpose of the present research is to test the potentialities offered by the new survey and 3D processing systems in order to carry out historical analyses and investigations in closed environments and for small scale architecture. Starting from the acquired data, the 3D models of the altars allow a 3D comparison between the works object of study and Pozzo’s treatise, also allowing speculation about their possible relations, providing extraordinary outcomes from the point of view of survey integrated methodologies and from the point of view of historical and geometric interpretation.</p>

Oblique Aerial Image Acquisition, 3D City Modeling, 3D City Guide Project for Konya Metropolitan Municipality

2019 ◽  
pp. 1371-1385
Author(s):  
Tuncer Ozerbıl ◽  
Ergun Gokten ◽  
Mustafa Onder ◽  
Osman Selcuk ◽  
Nilhan Ciftci Sarılar ◽  
...  
Keyword(s):  
Large Scale ◽  
Image Acquisition ◽  
Spatial Database ◽  
3D Models ◽  
Aerial Image ◽  
Oracle Spatial ◽  
Building Models ◽  
City Modeling ◽  
Oblique Images ◽  
First Time

Usage of aerial oblique cameras and oblique images in generation of 3D city models has become popular all over the world in recent years and various solutions has been developed involving specialized methods and softwares. The first comprehensive step in this field was taken by Konya Metropolitan Municipality in Turkey in 2012 and the project undertaken by GEOGIS has been successfully completed in February 2014. It is the first time in Turkey that 3D city model of this large scale has been generated. The project involves: Aerial image acquisition of the project area with vertical and oblique cameras respectively and photogrammetric triangulation; Development of OttoPenta software, which can display oblique images in pentaview screen, make spatial queries and also can measure the horizontal, vertical distance and area; Digitization of roof and roof structures from vertical stereo images using photogrammetric interpretation techniques and generation of 3D solid building models using this data; Assigning building ID numbers to solid models to integrate with the GIS data of the Municipality that is available in Oracle Spatial database; Automatic texturing of 3D models with oblique images; Exporting of textured 3D models into Oracle Spatial Database in CityGML format, complying the OGC standards; and development of KNVCity software, to create and publish the 3D city guide on WEB and mobile devices. The goal of this paper is sharing the experience and knowledge that was gained during the 3D City modeling and 3D city guide project which was performed for the first time in Turkey.

scholarly journals Investigation of 3D Models Acquired with UAV Oblique Images

2021 ◽  
Author(s):  
Lütfiye KARASAKA ◽  
Hasan Bilgehan MAKİNECİ
Keyword(s):  
3D Models ◽  
Oblique Images

scholarly journals UAV LINEAR PHOTOGRAMMETRY

2015 ◽  
Vol XL-3/W3 ◽  
pp. 327-333 ◽  
Author(s):  
V. Tournadre ◽  
M. Pierrot-Deseilligny ◽  
P. H. Faure
Keyword(s):  
Open Source ◽  
Ground Truth ◽  
3D Models ◽  
Bundle Adjustment ◽  
Acquisition Process ◽  
Calibration Models ◽  
All Solutions ◽  
Oblique Images ◽  
Free Open Source ◽  
Terrestrial Photogrammetry

The photogrammetric treatment of images acquired on a linear axis is a problematic case. Such tricky configurations often leads to bended 3D models, described as a bowl effect, which requires ground measurements to be fixed. This article presents different solutions to overcome that problem. All solutions have been implemented into the free open-source photogrammetric suite MicMac. The article presents the lasts evolutions of MicMac's bundle adjustment core, as well as some extended calibration models and how they fit for the camera evaluated. The acquisition process is optimized by presenting how oblique images can improve the accuracy of the orientations, while the 3D models accuracies are assessed by producing a millimeter accurate ground truth from terrestrial photogrammetry.

scholarly journals UNMANNED AERIAL VEHICLES FOR GEOLOGICAL APPLICATIONS

2017 ◽  
Vol 50 (3) ◽  
pp. 1662
Author(s):  
K.G. Nikolakopoulos ◽  
I. Koukouvelas ◽  
N.G. Argyropoulos
Keyword(s):  
Unmanned Aerial Vehicles ◽  
3D Models ◽  
Open Pit ◽  
Small Scale ◽  
Geometric Accuracy ◽  
Aerial Vehicles ◽  
Custom Made ◽  
Wide Angle Lens ◽  
Steep Terrain ◽  
Fish Eye

Remote Sensing and photogrammetric techniques have always been used in geological applications. Current advancements in the technology behind Unmanned Aerial Vehicles (UAVs), in accordance with the consecutive increase in affordability of such devices and the availability of photogrammetric software, makes their use for large or small scale land mapping more and more popular. With the UAVs being used for mapping, the problems of increased costs, time consumption and the possible accessibility problems -due to steep terrain-, are all solved at once. In this study, a custom-made UAV with 2 cameras onboard, is used to monitor two complex –regarding their topography- regions in Western Greece. One open pit limestone mine and a landslide occurring on sandy-clayous sediments. Both regions were mapped using surveying instruments like tachymeters and geodetic GPS, as well as using the aforementioned UAV system. 3D models of both regions were created using off-the-shelf photogrammetric software. For the creation of the 3D models, multiple targets were placed on the ground, to indicate GCPs with precisely known coordinates that could be identified in the high-resolution air photos, in order to maintain low Root Mean Square Error, while creating the DSMs and Orthophotos. In addition, the fish-eye effect caused by the cameras’ wide-angle lens was taken into consideration, regarding whether or not it affects the models’ overall geometric accuracy. Finally, the 3D models were compared to the survey measurements and the results are presented in this paper.  

scholarly journals AUTOMATIC TEXTURE RECONSTRUCTION OF 3D CITY MODEL FROM OBLIQUE IMAGES

2016 ◽  
Vol XLI-B1 ◽  
pp. 341-347
Author(s):  
Junhua Kang ◽  
Fei Deng ◽  
Xinwei Li ◽  
Fang Wan
Keyword(s):  
3D Models ◽  
Geometric Distortion ◽  
Mesh Parameterization ◽  
3D City Model ◽  
City Tourism ◽  
Visible Images ◽  
City Model ◽  
Real Estate Management ◽  
Oblique Images ◽  
Texture Reconstruction

In recent years, the photorealistic 3D city models are increasingly important in various geospatial applications related to virtual city tourism, 3D GIS, urban planning, real-estate management. Besides the acquisition of high-precision 3D geometric data, texture reconstruction is also a crucial step for generating high-quality and visually realistic 3D models. However, most of the texture reconstruction approaches are probably leading to texture fragmentation and memory inefficiency. In this paper, we introduce an automatic framework of texture reconstruction to generate textures from oblique images for photorealistic visualization. Our approach include three major steps as follows: mesh parameterization, texture atlas generation and texture blending. Firstly, mesh parameterization procedure referring to mesh segmentation and mesh unfolding is performed to reduce geometric distortion in the process of mapping 2D texture to 3D model. Secondly, in the texture atlas generation step, the texture of each segmented region in texture domain is reconstructed from all visible images with exterior orientation and interior orientation parameters. Thirdly, to avoid color discontinuities at boundaries between texture regions, the final texture map is generated by blending texture maps from several corresponding images. We evaluated our texture reconstruction framework on a dataset of a city. The resulting mesh model can get textured by created texture without resampling. Experiment results show that our method can effectively mitigate the occurrence of texture fragmentation. It is demonstrated that the proposed framework is effective and useful for automatic texture reconstruction of 3D city model.

Camera Configuration and Use of AUVs to Census Mobile Fauna

2007 ◽  
Vol 41 (4) ◽  
pp. 49-52 ◽  
Author(s):  
Peter J. Auster ◽  
James Lindholm ◽  
Megan Plourde ◽  
Kimberly Barber ◽  
Hanumant Singh
Keyword(s):  
Gulf Of Maine ◽  
Autonomous Underwater Vehicles ◽  
Image Data ◽  
Design Parameters ◽  
Small Scale ◽  
High Resolution Data ◽  
Need To Evaluate ◽  
Abundance And Diversity ◽  
Oblique Images ◽  
Forward Looking

There is a diversity of shapes and sensor configurations used in the design of autonomous underwater vehicles (AUVs). Cameras and lighting (for both still and video imaging) are common sensor systems and have traditionally been configured to produce orthogonal images of the seafloor. Such imagery provides invaluable small-scale, high-resolution data for studies of seafloor geology and sessile invertebrate communities. However, using orthogonal imagery to census the diversity of mobile fauna has limitations caused by avoidance. A simple analysis using species-individual curves demonstrated that species richness was generally lower in surveys using orthogonal images when compared to forward-looking oblique images despite encountering the same number of individual fishes. This pattern was consistent when contrasting data from separate AUV and ROV surveys at boulder reefs in the Gulf of Maine as well as from down-looking and forward-looking cameras simultaneously collecting video imagery from a camera sled in a variety of habitats. These results indicate a need to evaluate the effects of camera configuration on the performance of abundance and diversity indicators developed from image data acquired using AUVs and other vehicles. Further, we recommend that AUV designers endeavor to accommodate oblique angles for cameras and associated lighting within vehicle design parameters in order to support missions that improve detection of mobile fauna.

scholarly journals Making Use of 3D Models for Plant Physiognomic Analysis: A Review

2021 ◽  
Vol 13 (11) ◽  
pp. 2232
Author(s):  
Abhipray Paturkar ◽  
Gourab Sen Sen Gupta ◽  
Donald Bailey
Keyword(s):  
Plant Growth ◽  
Large Scale ◽  
3D Model ◽  
3D Models ◽  
Limiting Factors ◽  
Plant Phenotyping ◽  
Small Scale ◽  
Analysis Techniques ◽  
Current Limiting ◽  
3D Representations

Use of 3D sensors in plant phenotyping has increased in the last few years. Various image acquisition, 3D representations, 3D model processing and analysis techniques exist to help the researchers. However, a review of approaches, algorithms, and techniques used for 3D plant physiognomic analysis is lacking. In this paper, we investigate the techniques and algorithms used at various stages of processing and analysing 3D models of plants, and identify their current limiting factors. This review will serve potential users as well as new researchers in this field. The focus is on exploring studies monitoring the plant growth of single plants or small scale canopies as opposed to large scale monitoring in the field.

scholarly journals Computer Reconstruction of the Appearance of Amur Cossacks and the Manchu in the 17th Century

2021 ◽  
pp. 11-21
Author(s):  
Aleksei Viktorovich Natsvin ◽  
Il'ya Evgen'evich Eremin ◽  
Aleksei Yur'evich Lokhov
Keyword(s):  
Far East ◽  
Three Dimensional ◽  
3D Models ◽  
17Th Century ◽  
Small Scale ◽  
Scale Production ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Dimensional Models ◽  
Three Dimensional Models

The article studies historical appearance of Russian servicemen of the Far East in the 17th century as well as their traditional opponents &ndash; soldiers of the eight-banner army of Qing China. The study sets a goal to practically model and print 3D models of the people understudy. To form basic sketches of the models the authors use historical images as well as modern reconstructions of uniforms and weapons. Computer modeling was carried out using open software. The approach is to develop a utilitarian technique for high-quality modeling of three-dimensional models of historical characters without professional art education. As a result, the authors have got unique three-dimensional models made according to a single algorithm. The use of three-dimensional modeling technologies provides for a fairly simple creation of both a character model itself and his uniform and weapons. Also, three-dimensional modeling allows one to create copies of individual objects thus forming a library that can significantly reduce the time spent on creating similar models. 3D printing technologies make it easy to replicate physical copies of a 3D model which in this case makes it possible to fulfill orders for small-scale production of souvenirs. The models can be applied in industrial production such as casting and milling.

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