Results 31 to 40 of about 3,721 (173)

Mapping Wild Leek through the Forest Canopy Using a UAV

Remote Sensing, 2018
Wild leek, an endangered plant species of Eastern North America, grows on forest floors and greens up to approximately three weeks before the trees it is typically found under, temporarily allowing it to be observed through the canopy by remote sensing ...
Marie-Bé Leduc, Anders J. Knudby
doaj   +1 more source

Multi-light photogrammetric survey applied to the complex documentation of engravings in Palaeolithic rock art: the Cova de les Meravelles (Gandia, Valencia, Spain)

Heritage Science, 2022
The new phase of study and revision of the Palaeolithic art of the Cova de les Meravelles, as well as the advances made in the field of 3D documentation in recent years, have motivated a new documentation campaign on the main panel full of tiny engraved ...
Ana Cantó, José Luis Lerma, Rafael Martínez Valle, Valentín Villaverde   +3 more
doaj   +1 more source

Integrating a UAV-Derived DEM in Object-Based Image Analysis Increases Habitat Classification Accuracy on Coral Reefs

Remote Sensing, 2022
Very shallow coral reefs (
Brian O. Nieuwenhuis, Fabio Marchese, Marco Casartelli, Andrea Sabino, Sancia E. T. van der Meij, Francesca Benzoni   +5 more
doaj   +1 more source

Archival photogrammetric analysis of river–floodplain systems using Structure from Motion (SfM) methods [PDF]

Earth Surface Processes and Landforms, 2016
AbstractIn this study we evaluate the extent to which accurate topographic data can be obtained by applying Structure from Motion (SfM) photogrammetric methods to archival imagery. While SfM has proven valuable in photogrammetric applications using specially acquired imagery (e.g. from unmanned aerial vehicles), it also has the potential to improve the
Bakker Maarteen, Lane Stuart N.
openaire   +1 more source

A New Method for High Resolution Surface Change Detection: Data Collection and Validation of Measurements from UAS at the Nevada National Security Site, Nevada, USA

Drones, 2021
The use of uncrewed aerial systems (UAS) increases the opportunities for detecting surface changes in remote areas and in challenging terrain. Detecting surface topographic changes offers an important constraint for understanding earthquake damage ...
Brandon Crawford, Erika Swanson, Emily Schultz-Fellenz, Adam Collins, Julian Dann, Emma Lathrop, Damien Milazzo   +6 more
doaj   +1 more source

Estimation of Walnut Structure Parameters Using Terrestrial Photogrammetry Based on Structure-from-Motion (SfM)

Journal of the Indian Society of Remote Sensing, 2022
[EN] Remote sensing techniques are increasingly used for crop monitoring to improve the profitability of plantations. These studies are mainly based on spectral information recorded by satellites or unmanned aerial vehicles. However, the development of Earth Observation Systems capable of retrieving 3D point clouds at an affordable cost enables the ...
Alfonso Fernández-Sarría, Isabel López-Cortés, Jesús Martí, Javier Estornell   +3 more
openaire   +2 more sources

Dry Biomass Estimation of Hedge Banks: Allometric Equation vs. Structure from Motion via Unmanned Aerial Vehicle

Journal of Forest Science, 2018
The wood yield of hedge banks is very heterogeneous and hard to estimate in advance. The aim of the present study was to estimate the dry biomass of hedge banks shortly before harvesting using two different non-destructive approaches: (i) allometric ...
Stefan LINGNER, Eiko THIESSEN, Kerrin MÜLLER, Eberhard HARTUNG   +3 more
doaj   +1 more source

TC-SfM: Robust Track-Community-Based Structure-From-Motion

IEEE Transactions on Image Processing
Structure-from-Motion (SfM) aims to recover 3D scene structures and camera poses based on the correspondences between input images, and thus the ambiguity caused by duplicate structures (i.e., different structures with strong visual resemblance) always results in incorrect camera poses and 3D structures.
Lei Wang, Linlin Ge, Shan Luo, Zihan Yan, Zhaopeng Cui, Jieqing Feng   +5 more
openaire   +3 more sources

Perceptual Biases in the Interpretation of Non-Rigid Shape Transformations from Motion

Vision
Most existing research on the perception of 3D shape from motion has focused on rigidly moving objects. However, many natural objects deform non-rigidly, leading to image motion with no rigid interpretation.
Ryne Choi, Jacob Feldman, Manish Singh
doaj   +1 more source

Brief communication: Landslide motion from cross correlation of UAV-derived morphological attributes [PDF]

Natural Hazards and Earth System Sciences, 2017
Unmanned aerial vehicles (UAVs) can provide observations of high spatio-temporal resolution to enable operational landslide monitoring. In this research, the construction of digital elevation models (DEMs) and orthomosaics from UAV imagery is achieved
M. V. Peppa, J. P. Mills, P. Moore, P. E. Miller, J. E. Chambers   +4 more
doaj   +1 more source