Results 31 to 40 of about 17,614 (119)

The Accuracy Comparison of Three Simultaneous Localization and Mapping (SLAM)-Based Indoor Mapping Technologies

Sensors, 2018
The growing interest and the market for indoor Location Based Service (LBS) have been drivers for a huge demand for building data and reconstructing and updating of indoor maps in recent years.
Yuwei Chen, Jian Tang, Changhui Jiang, Lingli Zhu, Matti Lehtomäki, Harri Kaartinen, Risto Kaijaluoto, Yiwu Wang, Juha Hyyppä, Hannu Hyyppä, Hui Zhou, Ling Pei, Ruizhi Chen   +12 more
doaj   +1 more source

Measuring Leaf Water Content with Dual-Wavelength Intensity Data from Terrestrial Laser Scanners

Remote Sensing, 2016
Decreased leaf moisture content, typically measured as equivalent water thickness (EWT), is an early signal of tree stress caused by drought, disease, or pest insects.
Samuli Junttila, Mikko Vastaranta, Xinlian Liang, Harri Kaartinen, Antero Kukko, Sanna Kaasalainen, Markus Holopainen, Hannu Hyyppä, Juha Hyyppä   +8 more
doaj   +1 more source

Self-calibration of terrestrial laser scanners: selection of the best geometric additional parameters [PDF]

ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2014
Systematic errors are present in laser scanning system observations due to manufacturer imperfections, wearing over time, vibrations, changing environmental conditions and, last but not least, involuntary hits.
J. L. Lerma, D. García-San-Miguel
doaj   +1 more source

Camera Characterisation Based on Skin-Tone Colours for Rock Art Recording

Proceedings, 2019
Image-based characterisation offers accurate results for colour recording in cultural heritage documentation tasks. Although numerous researches are focused on improving either the mathematical model used or the workflow technical details, in this paper ...
Adolfo Molada-Tebar, Ángel Marqués-Mateu, José Luis Lerma   +2 more
doaj   +1 more source

Fusion of range-based data and image-based datasets for efficient documentation of cultural heritage objects and sites [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2015
Nowadays it is possible to measure accurately dense point clouds either with aerial/terrestrial laser scanning systems or with imagebased solutions (namely based on photogrammetric computer vision algorithms such as structure-from-motion (SfM)), from ...
J. L. Lerma, M. Cabrelles, S. Navarro
doaj   +1 more source

Adaptive laser range scanning

2008 American Control Conference, 2008
We present an approach to laser range scanning in which quality metrics are used to automatically reduce the number of measurements acquired from a scanner viewpoint. As part of this approach we present improved versions of the orientation and reflectivity quality metrics, as well as introduce two quality metrics: resolvability and planarity.
MacKinnon, David, Aitken, V., Blais, François   +2 more
openaire   +3 more sources

Geometrical Accuracy Investigations of Handheld 3D Scanners in Comparison: Low-Cost vs. High-End [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Handheld 3D scanners have gained increasing importance in recent years due to their flexibility and declining acquisition costs. While high-end systems provide standardized accuracy specifications, affordable devices often lack reliable and comparable ...
T. P. Kersten, M. Marsmann, H.-J. Przybilla   +2 more
doaj   +1 more source

Geometric Accuracy Investigations of Mobile Phone Devices in the Laboratory Using High-Precision Reference Bodies [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
The sensors in modern mobile phones (running either the Android or iOS operating system) have become increasingly sophisticated, to the extent that they can be used as measuring systems for a wide range of applications.
T. P. Kersten, L. Sönksen, H.-J. Przybilla   +2 more
doaj   +1 more source

Multiband Photogrammetry and Hybrid Image Analysis for the Investigation of a Wall Painting by Paolo de San Leocadio and Francesco Pagano in the Cathedral of Valencia

Sensors, 2023
A workflow for the photogrammetric combination of non-invasive multispectral imaging techniques ranging from ultraviolet (UV) and visible (VIS) to near infrared (NIR) for the investigation of wall paintings is presented.
Max Rahrig, Miguel Ángel Herrero Cortell, José Luis Lerma   +2 more
doaj   +1 more source

MEASURING LEAF WATER CONTENT USING MULTISPECTRAL TERRESTRIAL LASER SCANNING [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2017
Climate change is increasing the amount and intensity of disturbance events, i.e. drought, pest insect outbreaks and fungal pathogens, in forests worldwide. Leaf water content (LWC) is an early indicator of tree stress that can be measured remotely using
S. Junttila, S. Junttila, M. Vastaranta, M. Vastaranta, R. Linnakoski, R. Linnakoski, J. Sugano, H. Kaartinen, A. Kukko, A. Kukko, M. Holopainen, M. Holopainen, H. Hyyppä, H. Hyyppä, J. Hyyppä, J. Hyyppä   +15 more
doaj   +1 more source