THE USE OF COMPUTER VISION ALGORITHMS FOR AUTOMATIC ORIENTATION OF TERRESTRIAL LASER SCANNING DATA

Depth Map ◽

Point Clouds ◽

Key Points ◽

Source Data ◽

Panoramic Images

The paper presents analysis of the orientation of terrestrial laser scanning (TLS) data. In the proposed data processing methodology, point clouds are considered as panoramic images enriched by the depth map. Computer vision (CV) algorithms are used for orientation, which are applied for testing the correctness of the detection of tie points and time of computations, and for assessing difficulties in their implementation. The BRISK, FASRT, MSER, SIFT, SURF, ASIFT and CenSurE algorithms are used to search for key-points. The source data are point clouds acquired using a Z+F 5006h terrestrial laser scanner on the ruins of Iłża Castle, Poland. Algorithms allowing combination of the photogrammetric and CV approaches are also presented.

ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences ◽

THE EXAMPLE OF USING INTENSITY ORTHOIMAGES IN TLS DATA REGISTRATION – A CASE STUDY

10.5194/isprs-archives-xlii-2-w3-467-2017 ◽

2017 ◽

Vol XLII-2/W3 ◽

pp. 467-474 ◽

Cited By ~ 3

Author(s):

J. S. Markiewicz

Keyword(s):

Laser Scanning ◽

Laser Scanner ◽

Point Clouds ◽

Point Distribution ◽

Data Registration ◽

Depth Maps ◽

Source Data ◽

Panoramic Images

The paper presents the orientation analysis of terrestrial laser scanning (TLS) data. In the proposed data processing methodology, point clouds are considered as panoramic images and orthoimages enriched by depth maps. Computer vision (CV) algorithms were used for the orientation; they were applied to test the correctness of the detection of tie points, as well as the accuracy, number and point distribution. For the source data, point clouds acquired from the terrestrial laser scanner Z+F 50063h for the two chambers in the Museum of King John III’s Palace in Wilanów were utilized.

How Much of a Historic Town Can Be Mapped by a Terrestrial Laser Scanner within a Working Day? - A Single Touch Workflow

Studies in Digital Heritage ◽

10.14434/sdh.v1i2.23332 ◽

2017 ◽

Vol 1 (2) ◽

pp. 239-250

Author(s):

Christoph Fürst ◽

Nikolaus Studnicka ◽

Martin Pfennigbauer

Keyword(s):

Laser Scanning ◽

Laser Scanner ◽

Point Clouds ◽

Urban Environments ◽

Single Operator ◽

Working Day ◽

The One ◽

3D Information

Downtown Vienna with its world-famous cultural sites and architectural features is most definitely worth conservation. One way to archive at least a digital 3D imprint is laser scanning. While urban mapping with airborne or mobile laser scanning is fast and efficient, the resulting point clouds might not have the required resolution or might experience gaps due to shadowing. Terrestrial laser scanning has the potential to overcome these limitations. However, it has long been considered time-consuming and labour-intensive both while capturing and also while processing the data.In order to challenge this, we performed a field test with the new RIEGL VZ-400i terrestrial laser scanner. For eight hours, in the night from 2nd to 3rd of June 2016, one single operator employed the instrument throughout the city center of Vienna. He managed to take 514 high-resolution laser scans with approximately 9m between the scan positions.The data acquired in the course of this test impressively demonstrates the potential of state-of-the-art terrestrial laser scanning to preserve detailed 3D-information of urban environments within limited amount of time. This paper describes the complete workflow from the one touch operation in the field up to the automatic registration process of the collected laser scans.

Arrangement of terrestrial laser scanner positions for area-wide stem mapping of natural forests

Canadian Journal of Forest Research ◽

10.1139/cjfr-2012-0347 ◽

2013 ◽

Vol 43 (4) ◽

pp. 355-363 ◽

Cited By ~ 23

Author(s):

Jan Trochta ◽

Kamil Král ◽

David Janík ◽

Dušan Adam

Keyword(s):

Laser Scanning ◽

Quantitative Assessment ◽

Recognition Rate ◽

Laser Scanner ◽

Point Clouds ◽

Laser Beams ◽

Rough Terrain ◽

Natural Forests

With the development of terrestrial laser scanning (TLS) and its applications in forestry, the question arises as to how the scanners should be ideally placed for the best possible data acquisition. We searched for an optimal scanning distance for recognition of stems in natural beech-dominated forests, focusing particularly on the shading effect of tree stems and terrain. Recognised tree stems in TLS point clouds were compared with reference stem maps. A GIS-based visibility simulation was carried out to enhance the quantitative assessment and generalizability of results. The analyses also include the additive effect of multiple scanning positions. Single scans only have a tree recognition rate above 80% up to a distance of 15 m from the scanner; using at least three scanning positions a comparable recognition rate was attained up to 20–25 m. A simulated coverage of a beech-dominated natural forest by laser beams using a 40 m square grid of scanning positions captured at least half of the stem perimeter for more than 90% of trees with a DBH ≥ 10 cm. In sites with rough terrain, the relief configuration has a more significant effect of occlusion than present tree stems.

3D MODELS OF OBJECTS IN PROCESS OF RECONSTRUCTION

САВРЕМЕНА ТЕОРИЈА И ПРАКСА У ГРАДИТЕЉСТВУ ◽

10.7251/stp1813283r ◽

2018 ◽

Vol 13 (1) ◽

Author(s):

Jovana Radović

Keyword(s):

Laser Scanning ◽

Laser System ◽

Three Dimensional ◽

Laser Scanner ◽

3D Models ◽

Accurate Data ◽

Final Model ◽

Airborne Laser

Within the last years terrestrial and airborne laser scanning has become a powerful technique for fast and efficient three-dimensional data acquisition of different kinds of objects. Airborne laser system (LiDAR) collects accurate georeferenced data of extremely large areas very quickly while the terrestrial laser scanner produces dense and geometrically accurate data. The combination of these two segments of laser scanning provides different areas of application. One of the applications is in the process of reconstruction of objects. Objects recorded with laser scanning technology and transferred into the final model represent the basis for building an object as it was original. In this paper, there will be shown two case studies based on usage of airborne and terrestrial laser scanning and processing of the data collected by them.

The TLS technique as a way of identification and measurement of damaged elements of a historic sacral building

MATEC Web of Conferences ◽

10.1051/matecconf/201928408007 ◽

2019 ◽

Vol 284 ◽

pp. 08007

Author(s):

Joanna A. Pawłowicz

Keyword(s):

Laser Scanning ◽

Laser Scanner ◽

Technical Condition ◽

Building Trade ◽

Measurement Devices ◽

Short Time ◽

Cloud Of Points ◽

Advanced Computer

3D terrestrial laser scanning (TLS) is a modern measurement technique which enables to obtain a large amount of data in short time. The gathered data is very detailed, thus the scope of its use is vast. Therefore scanners other measurement devices which results in considerable acceleration of stock-taking work. This approach enables to prepare a documentation of a building or to make an assessment of its technical condition using only a 3D cloud of points. Additionally, flexibility of data and advanced computer programmes make it possible to use such data in many sectors, not only in the building trade. The paper shows the issue of using a 3D terrestrial laser scanner ant the TLS (Terrestrial Laser Scanning) technique for identification and measurement of damaged elements on the example of a historical sacral building.

Geoarchaeological site documentation and analysis of 3D data derived by terrestrial laser scanning

ISPRS Annals of Photogrammetry Remote Sensing and Spatial Information Sciences ◽

10.5194/isprsannals-ii-5-173-2014 ◽

2014 ◽

Vol II-5 ◽

pp. 173-179 ◽

Cited By ~ 4

Author(s):

D. Hoffmeister ◽

S. Zellmann ◽

K. Kindermann ◽

A. Pastoors ◽

U. Lang ◽

...

Keyword(s):

Cross Sections ◽

Laser Scanning ◽

Laser Scanner ◽

Point Clouds ◽

3D Data ◽

Research Problems ◽

Survey Results ◽

Rtk Gps ◽

Derived Data

Terrestrial laser scanning was conducted to document and analyse sites of geoarchaeological interest in Jordan, Egypt and Spain. In those cases, the terrestrial laser scanner LMS-Z420i from Riegl was used in combination with an accurate RTK-GPS for georeferencing of the point clouds. Additionally, local surveying networks were integrated by established transformations and used for indirect registration purposes. All data were integrated in a workflow that involves different software and according results. The derived data were used for the documentation of the sites by accurate plans and cross-sections. Furthermore, the 3D data were analysed for geoarchaeological research problems, such as volumetric determinations, the ceiling thickness of a cave and lighting simulations based on path tracing. The method was reliable in harsh environmental conditions, but the weight of the instrument, the measuring time and the minimum measurement distance were a drawback. However, generally an accurate documentation of the sites was possible. Overall, the integration in a 3D GIS is easily possible by the accurate georeference of the derived data. In addition, local survey results are also implemented by the established transformations. Enhanced analyses based on the derived 3D data shows promising results.

ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences ◽

Fusion of high resolution remote sensing images and terrestrial laser scanning for improved biomass estimation of maize

10.5194/isprsarchives-xl-7-101-2014 ◽

2014 ◽

Vol XL-7 ◽

pp. 101-108 ◽

Cited By ~ 6

Author(s):

C. Hütt ◽

H. Schiedung ◽

N. Tilly ◽

G. Bareth

Keyword(s):

High Resolution ◽

Laser Scanning ◽

Laser Scanner ◽

Point Clouds ◽

Satellite System ◽

Biomass Estimation ◽

Digital Elevation ◽

Elevation Model ◽

In The Beginning

In this study, images from the satellite system WorldView-2 in combination with terrestrial laser scanning (TLS) over a maize field in Germany are investigated. Simultaneously to the measurements a biomass field campaigns was carried out. From the point clouds of the terrestrial laser scanning campaigns crop surface models (CSM) from each scanning date were calculate to model plant growth over time. These results were resampled to match the spatial resolution of the WorldView-2 images, which had to orthorectified using a high resolution digital elevation model and atmosphere corrected using the ATCOR Software package. A high direct correlation of the NDVI calculated from the WorldView-2 sensor and the dry biomass was found in the beginning of June. At the same date, the heights from laser scanning can also explain a certain amount of the biomass variation (r2 = 0.6). By combining the NDVI from WorldView-2 and the height from the laser scanner with a linear model, the R2 reaches higher values of 0.86. To further understand the relationship between CSM derived crop heights and reflection indices, a comparison on a pixel basis was performed. Interestingly, the correlation of the NDVI and the crop height is rather low at the beginning of June (r2 = 0,4, n = 1857) and increases significantly (R2 = 0,79, N = 1857) at a later stage.

Terrestrial laser scanning in monitoring of anthropogenic objects

Geodesy and Cartography ◽

10.1515/geocart-2017-0011 ◽

2017 ◽

Vol 66 (2) ◽

pp. 347-364

Author(s):

Janina Zaczek-Peplinska ◽

Maria Kowalska

Keyword(s):

Laser Scanning ◽

Incidence Angle ◽

Geometric Analysis ◽

Laser Scanner ◽

Point Clouds ◽

Angle Of Incidence ◽

Point Distribution ◽

Common Coordinate System ◽

Cloud Of Points

Abstract The registered xyz coordinates in the form of a point cloud captured by terrestrial laser scanner and the intensity values (I) assigned to them make it possible to perform geometric and spectral analyses. Comparison of point clouds registered in different time periods requires conversion of the data to a common coordinate system and proper data selection is necessary. Factors like point distribution dependant on the distance between the scanner and the surveyed surface, angle of incidence, tasked scan’s density and intensity value have to be taken into consideration. A prerequisite for running a correct analysis of the obtained point clouds registered during periodic measurements using a laser scanner is the ability to determine the quality and accuracy of the analysed data. The article presents a concept of spectral data adjustment based on geometric analysis of a surface as well as examples of geometric analyses integrating geometric and physical data in one cloud of points: cloud point coordinates, recorded intensity values, and thermal images of an object. The experiments described here show multiple possibilities of usage of terrestrial laser scanning data and display the necessity of using multi-aspect and multi-source analyses in anthropogenic object monitoring. The article presents examples of multisource data analyses with regard to Intensity value correction due to the beam’s incidence angle. The measurements were performed using a Leica Nova MS50 scanning total station, Z+F Imager 5010 scanner and the integrated Z+F T-Cam thermal camera.

3D Reconstruction of Mining Area Based on Terrestrial Laser Scanner and Calculation of Extraction

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.325-326.1787 ◽

2013 ◽

Vol 325-326 ◽

pp. 1787-1791 ◽

Cited By ~ 1

Author(s):

Hang Chen ◽

Zhang Ying ◽

Zhen Feng Shao ◽

Zhi Qiang Du

Keyword(s):

3D Reconstruction ◽

Laser Scanning ◽

3D Model ◽

Laser Scanner ◽

Mining Area ◽

New Method ◽

Surveying And Mapping

This paper analyzes the characteristics of terrestrial laser scanning technology and it's advantages of surveying and mapping application in mining area. Through the analysis of the specific topographical features of mining area, we design a new method in measurement based on the terrestrial laser scanning technology, and probe into the methods of 3D reconstruction and calculation of extraction. Experiments show that the proposed method can improve the efficiency of surveying and mapping in mining area , the 3D model can be used to monitor the extraction of mining area.