scholarly journals 3D MODEL GENERATION USING OBLIQUE IMAGES ACQUIRED BY UAV

2017 ◽  
Vol XLII-4/W2 ◽  
pp. 107-115 ◽  
Author(s):  
A. Lingua ◽  
F. Noardo ◽  
A. Spanò ◽  
S. Sanna ◽  
F. Matrone
Keyword(s):  
Open Source ◽  
Open Source Software ◽  
Low Cost ◽  
Flight Planning ◽  
North West ◽  
Ground Control Points ◽  
Critical Issues ◽  
Aerial Vehicle ◽  
High Level ◽  
Oblique Images

In recent years, many studies revealed the advantages of using airborne oblique images for obtaining improved 3D city models (including façades and building footprints). Here the acquisition and use of oblique images from a low cost and open source Unmanned Aerial Vehicle (UAV) for the 3D high-level-of-detail reconstruction of historical architectures is evaluated. The critical issues of such acquisitions (flight planning strategies, ground control points distribution, etc.) are described. Several problems should be considered in the flight planning: best approach to cover the whole object with the minimum time of flight; visibility of vertical structures; occlusions due to the context; acquisition of all the parts of the objects (the closest and the farthest) with similar resolution; suitable camera inclination, and so on. In this paper a solution is proposed in order to acquire oblique images with one only flight. The data processing was realized using Structure-from-Motion-based approach for point cloud generation using dense image-matching algorithms implemented in an open source software. The achieved results are analysed considering some check points and some reference LiDAR data. The system was tested for surveying a historical architectonical complex: the “Sacro Mo nte di Varallo Sesia” in north-west of Italy. This study demonstrates that the use of oblique images acquired from a low cost UAV system and processed through an open source software is an effective methodology to survey cultural heritage, characterized by limited accessibility, need for detail and rapidity of the acquisition phase, and often reduced budgets.

scholarly journals UAV PHOTOGRAMMETRY WITH OBLIQUE IMAGES: FIRST ANALYSIS ON DATA ACQUISITION AND PROCESSING

2016 ◽  
Vol XLI-B1 ◽  
pp. 835-842 ◽  
Author(s):  
I. Aicardi ◽  
F. Chiabrando ◽  
N. Grasso ◽  
A. M. Lingua ◽  
F. Noardo ◽  
...  
Keyword(s):  
Low Cost ◽  
Complete Information ◽  
Point Of View ◽  
Historical Building ◽  
Critical Issues ◽  
Commercial Off The Shelf ◽  
Aerial Platforms ◽  
High Level ◽  
Architectural Survey ◽  
Oblique Images

In recent years, many studies revealed the advantages of using airborne oblique images for obtaining improved 3D city models (e.g. including façades and building footprints). Expensive airborne cameras, installed on traditional aerial platforms, usually acquired the data. The purpose of this paper is to evaluate the possibility of acquire and use oblique images for the 3D reconstruction of a historical building, obtained by UAV (Unmanned Aerial Vehicle) and traditional COTS (Commercial Off-the-Shelf) digital cameras (more compact and lighter than generally used devices), for the realization of high-level-of-detail architectural survey. The critical issues of the acquisitions from a common UAV (flight planning strategies, ground control points, check points distribution and measurement, etc.) are described. Another important considered aspect was the evaluation of the possibility to use such systems as low cost methods for obtaining complete information from an aerial point of view in case of emergency problems or, as in the present paper, in the cultural heritage application field. The data processing was realized using SfM-based approach for point cloud generation: different dense image-matching algorithms implemented in some commercial and open source software were tested. The achieved results are analysed and the discrepancies from some reference LiDAR data are computed for a final evaluation. The system was tested on the S. Maria Chapel, a part of the Novalesa Abbey (Italy).

scholarly journals UAV PHOTOGRAMMETRY WITH OBLIQUE IMAGES: FIRST ANALYSIS ON DATA ACQUISITION AND PROCESSING

2016 ◽  
Vol XLI-B1 ◽  
pp. 835-842 ◽  
Author(s):  
I. Aicardi ◽  
F. Chiabrando ◽  
N. Grasso ◽  
A. M. Lingua ◽  
F. Noardo ◽  
...  
Keyword(s):  
Low Cost ◽  
Complete Information ◽  
Point Of View ◽  
Historical Building ◽  
Critical Issues ◽  
Commercial Off The Shelf ◽  
Aerial Platforms ◽  
High Level ◽  
Architectural Survey ◽  
Oblique Images

In recent years, many studies revealed the advantages of using airborne oblique images for obtaining improved 3D city models (e.g. including façades and building footprints). Expensive airborne cameras, installed on traditional aerial platforms, usually acquired the data. The purpose of this paper is to evaluate the possibility of acquire and use oblique images for the 3D reconstruction of a historical building, obtained by UAV (Unmanned Aerial Vehicle) and traditional COTS (Commercial Off-the-Shelf) digital cameras (more compact and lighter than generally used devices), for the realization of high-level-of-detail architectural survey. The critical issues of the acquisitions from a common UAV (flight planning strategies, ground control points, check points distribution and measurement, etc.) are described. Another important considered aspect was the evaluation of the possibility to use such systems as low cost methods for obtaining complete information from an aerial point of view in case of emergency problems or, as in the present paper, in the cultural heritage application field. The data processing was realized using SfM-based approach for point cloud generation: different dense image-matching algorithms implemented in some commercial and open source software were tested. The achieved results are analysed and the discrepancies from some reference LiDAR data are computed for a final evaluation. The system was tested on the S. Maria Chapel, a part of the Novalesa Abbey (Italy).

Open source software as a mature library system in Armenia

Infolib ◽  
2021 ◽  
Vol 26 (2) ◽  
pp. 34-37
Author(s):  
Anna Chulyan ◽  
Keyword(s):  
Cultural Heritage ◽  
Open Source ◽  
Open Source Software ◽  
New Technologies ◽  
Digital Preservation ◽  
Free Access ◽  
Efficient Organization ◽  
Digital Repositories ◽  
High Level

The article touches upon the importance of long-term digital preservation of Armenian cultural heritage through creation of digital repositories using Open-Source Software in Armenian libraries. The research highlights the advantages of Open-Source Software in context of providing free access to digital materials, as well as its high level of functionality in order to empower libraries with new technologies for more efficient organization and dissemination of information.

scholarly journals Merging a Remote Microscope and Virtual Worlds: Teaching Kingdom Plantae on Basic Education

2016 ◽  
Vol 12 (04) ◽  
pp. 27 ◽  
Author(s):  
Caroline Porto Antonio ◽  
João Paulo Lima ◽  
João Bosco Alves ◽  
Juarez Bento Silva ◽  
José Pedro Simão
Keyword(s):  
Learning Environment ◽  
Open Source ◽  
Science Teaching ◽  
Open Source Software ◽  
Virtual Worlds ◽  
Basic Education ◽  
Low Cost ◽  
Virtual Learning Environment ◽  
Educational Tool ◽  
Plant Parts

This paper presents an educational tool based on open source software and low cost hardware to supplement science teaching, merging concepts of remote experiment, virtual worlds and virtual learning environment. Using an avatar, students can move around in an enriched environment and access a remote microscope that enables visualization of plant parts and interaction with the available samples.

scholarly journals Accuracy of 3D Landscape Reconstruction without Ground Control Points Using Different UAS Platforms

Drones ◽  
2020 ◽  
Vol 4 (2) ◽  
pp. 13 ◽  
Author(s):  
Margaret Kalacska ◽  
Oliver Lucanus ◽  
J. Pablo Arroyo-Mora ◽  
Étienne Laliberté ◽  
Kathryn Elmer ◽  
...  
Keyword(s):  
Low Cost ◽  
Ground Control ◽  
Unmanned Aerial Systems ◽  
Control Points ◽  
Model Errors ◽  
Positional Accuracy ◽  
Ground Control Points ◽  
Digital Elevation ◽  
High Level ◽  
Aerial Systems

The rapid increase of low-cost consumer-grade to enterprise-level unmanned aerial systems (UASs) has resulted in the exponential use of these systems in many applications. Structure from motion with multiview stereo (SfM-MVS) photogrammetry is now the baseline for the development of orthoimages and 3D surfaces (e.g., digital elevation models). The horizontal and vertical positional accuracies (x, y and z) of these products in general, rely heavily on the use of ground control points (GCPs). However, for many applications, the use of GCPs is not possible. Here we tested 14 UASs to assess the positional and within-model accuracy of SfM-MVS reconstructions of low-relief landscapes without GCPs ranging from consumer to enterprise-grade vertical takeoff and landing (VTOL) platforms. We found that high positional accuracy is not necessarily related to the platform cost or grade, rather the most important aspect is the use of post-processing kinetic (PPK) or real-time kinetic (RTK) solutions for geotagging the photographs. SfM-MVS products generated from UAS with onboard geotagging, regardless of grade, results in greater positional accuracies and lower within-model errors. We conclude that where repeatability and adherence to a high level of accuracy are needed, only RTK and PPK systems should be used without GCPs.

Review of Open Source Software (OSS)

2012 ◽  
pp. 26-40
Author(s):  
Bhasker Mukerji ◽  
Ramaraj Palanisamy
Keyword(s):  
Developing Countries ◽  
Public Sector ◽  
Open Source ◽  
Open Source Software ◽  
Low Cost ◽  
Source Code ◽  
Developed Countries ◽  
Economic Resources ◽  
Large Pool ◽  
Public Sector Organizations

The popularity of Open Source Software (OSS) in developing countries is quiet evident from its widespread adoption across government departments and public sector organizations. The use of OSS saves economic resources of cash starved countries, provides an opportunity to promote e-government, and to utilize their resources in other sectors. Many developing countries have a large pool of skilled developers who can modify the source code of the OSS at a very low cost. Many governments in developing and developed countries have switched to OSS which probably encourages others to follow the trend. It was not possible to follow the adoption trend in all the developing countries but the usage of OSS in countries like India, Brazil, and Venezuela provides us an insight. The successful adoption of OSS requires thorough analysis of its advantages as well as the issues associated with it. This chapter will provide an overview of OSS, characteristics of OSS developers, and their motivation to volunteer by contributing in OSS projects, followed by the advantages and issues associated with OSS.

OpenLaszlo

2011 ◽  
pp. 157-170
Author(s):  
Chris Moya
Keyword(s):  
Open Source ◽  
Open Source Software ◽  
User Centered Design ◽  
Rich Internet Application ◽  
Proprietary Software ◽  
Web Environment ◽  
Device Applications ◽  
Internet Application ◽  
High Level ◽  
Back Office

Programming a rich Internet application (RIA) in any Web environment is the goal of Laszlo Systems. The open source software, OpenLaszlo Presentation Server, allows a user to run, on any device, applications that blend to perfection a user-centered design. It facilitates development from the basic levels such as creating forms, menus and other components for a website, up to high-level tasks like focusing on the attention of the user, to easily create, for example, an e-commerce website, a full management back office or a trip booking site, all this using animations comparable to those created with proprietary software.

scholarly journals Software-Based Three-Dimensional Deconvolution Microscopy of Cytoskeletal Proteins in Cultured Fibroblast Using Open-Source Software and Open Hardware

2019 ◽  
Vol 5 (12) ◽  
pp. 88
Author(s):  
Kazuo Katoh
Keyword(s):  
Open Source ◽  
Open Source Software ◽  
Laser Scanning ◽  
Low Cost ◽  
Three Dimensional ◽  
Cytoskeletal Proteins ◽  
Laser Scanning Microscopy ◽  
Confocal Laser ◽  
Actual Measurement ◽  
Open Hardware

As conventional fluorescence microscopy and confocal laser scanning microscopy generally produce images with blurring at the upper and lower planes along the z-axis due to non-focal plane image information, the observation of biological images requires “deconvolution.” Therefore, a microscope system’s individual blur function (point spread function) is determined theoretically or by actual measurement of microbeads and processed mathematically to reduce noise and eliminate blurring as much as possible. Here the author describes the use of open-source software and open hardware design to build a deconvolution microscope at low cost, using readily available software and hardware. The advantage of this method is its cost-effectiveness and ability to construct a microscope system using commercially available optical components and open-source software. Although this system does not utilize expensive equipment, such as confocal and total internal reflection fluorescence microscopes, decent images can be obtained even without previous experience in electronics and optics.

scholarly journals CORRECTION OF MOBILE MAPPING TRAJECTORIES IN GNSS-DENIED ENVIRONMENTS USING AERIAL NADIR AND AERIAL OBLIQUE IMAGES

2019 ◽  
Vol XLII-2/W13 ◽  
pp. 1649-1654
Author(s):  
P. Fanta-Jende ◽  
F. Nex ◽  
M. Gerke ◽  
J. Lijnen ◽  
G. Vosselman
Keyword(s):  
High Speed ◽  
Low Cost ◽  
Image Data ◽  
City Centre ◽  
Ground Control ◽  
Control Points ◽  
Mobile Mapping ◽  
Ground Control Points ◽  
Before And After ◽  
Oblique Images

<p><strong>Abstract.</strong> Mobile mapping enables highly accurate as well as high-resolution image data capture at low cost and high speed. As a terrestrial acquisition technique predominately employed in urban, and thus built-up areas, non-line-of-sight and multipath effects challenge its absolute positioning capabilities provided by GNSS. In conjunction with IMU drift, the platform’s trajectory has an unknown accuracy, which influences the quality of the data product. By employing a highly accurate co-registration technique for identifying tie correspondences between mobile mapping images and aerial nadir as well as aerial oblique images, reliable ground control can be introduced into an adjustment solution. We exemplify the performance of our registration results by showcasing adjusted mobile mapping trajectories in four different test areas, each with about 100 consecutive recording locations (approx. 500&amp;thinsp;m length) in the city centre of Rotterdam, The Netherlands. The mobile mapping data has been adjusted in different configurations, i.e. with nadir or oblique aerial correspondences only and if possible in conjunction. To compare the horizontal as well as the vertical accuracy before and after the respective adjustments, more than 30 ground control points were surveyed for these experiments. In general, the aim of our technique is not only to correct mobile mapping trajectories in an automated fashion but also to verify their accuracy without the need to acquire ground control points. In most of our test cases, the overall accuracy of the mobile mapping image positions in the trajectory could be improved. Depending on the test area, an RMSE in 3D between 15 and 21&amp;thinsp;cm and an RMSE in 2D between 11 and 18&amp;thinsp;cm is achievable.</p>

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