Consulta: subjectFacets:"Photogrammetry"
Registros recuperados: 15
Data/hora: 01/06/2024 02:15:49

Produção de ortomapas com VANTs e OpenDroneMap.
Provedor de dados: 14
Autores: SANTOS, T. T.; KOENIGKAN, L. V.
Introdução. Princípios de fotogrametria. Correspondências entre imagens. Captura de imagens com multirrotores. Legislação. Planejamento da missão. Configurações. GCPs. Checklist. Utilização do OpenDroneMap. Instalação. Execução. Resultados produzidos. Outras opções e configurações do ODM. Interrupção do ODM. Algoritmos empregados pelo OpenDroneMap. Conclusões.
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Veículos Aéreos Não-Tripulados; Ortomapas; OpenDroneMap; Software de visão estéreo múltipla; Visão computacional; Fotogrametria; Photogrammetry; Computer vision.
Ano: 2018
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1102033

3DMCAP documentation: release 1.0.
Provedor de dados: 14
Autores: SANTOS, T. T.
This document is the user manual of a tool, 3DMCAP, developed by our Automation Group for photogrammetry using a single camera and a notebook computer. Our staff was able to use it to recover the three-dimensional structure of plants in greenhouses and in open fields, including vines, coffee trees, maize, sunflower, soybean eucalyptus trunks.
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Manual do usuário; Ferramenta 3DMCAP; Imagem digital; Visão computacional; Fotogrametria; Photogrammetry; Digital images; Image analysis; Computer vision.
Ano: 2018
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1102027

Estimativa do volume de madeira em pátios de estocagem de toras por meio de câmeras RGB instaladas em Aeronaves Remotamente Pilotadas (ARP).
Provedor de dados: 14
Autores: FIGUEIREDO, E. O.; OLIVEIRA, M. V. N. d'; LOCKS, C. J.; PAPA, D. de A.
A utilização de câmeras fotográficas acopladas a aeronaves remotamente pilotadas (ARP) na engenharia consiste em uma alternativa de baixo custo para o mapeamento e modelagem 3D por meio de nuvens de pontos produzidas pelo processamento estereoscópico das ortofotos obtidas durante o voo. O objetivo deste trabalho foi avaliar e selecionar uma estratégia de plano de voo semiautônomo para fotogrametria usando uma câmera RGB acoplada a um ARP multirrotor (classe III), cujo produto é a obtenção de nuvens de pontos de alta densidade, visando à estimativa do volume de madeira em pátios de estocagem de toras. Foi testada a acurácia das estimativas de volume de 12 pilhas de toras de madeira, produzidas pelo processamento da nuvem de pontos de imagens obtidas em três...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Drone; Modelagem 3D; 3D modeling; Modelado 3D; Câmera RGB; Wood storage; Almacenamiento de la madera; Dendrometry; Rio Branco (AC); Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Dendometria; Vehículos aéreos no tripulados.; Troncos; Biometrics; Serrerías; Aerofotogrametria; Madeira; Tora; Serraria; Estocagem; Biometria; Dendrometria; Fotogrametria.; Photogrammetry; Unmanned aerial vehicles; Wood logs; Sawmills.
Ano: 2016
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1066063

Potential of UAVs for Monitoring Mudflat Morphodynamics (Application to the Seine Estuary, France)
Provedor de dados: 5
Autores: Jaud, Marion; Grasso, Florent; Le Dantec, Nicolas; Verney, Romaric; Delacourt, Christophe; Ammann, Jerome; Deloffre, Julien; Grandjean, Philippe.
Intertidal mudflats play a critical role in estuarine exchange, connecting marine and continental supplies of nutrients and sediments. However, their complex morphodynamics, associated with a wide range of physical and biological processes, are still poorly understood and require further field investigation. In addition, mudflats are challenging areas for Structure-from-Motion (SfM) photogrammetric surveys. Indeed, the mudflats generally hold back residual tidal water, which can make stereo restitution particularly difficult because of poor correlations or sun-glint effects. This study aims to show the potential of light UAVs (Unmanned Aerial Vehicles) for monitoring sedimentary hydrodynamics at different spatial scales in a silty estuary. For each UAV...
Tipo: Text
Palavras-chave: Coastal monitoring; Unmanned Aerial Vehicle; Photogrammetry; Estuary; Mudflat areas; Morphological features.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00326/43721/43167.pdf

Surveying coastal zone topography with airborne remote sensing for benthos mapping
Provedor de dados: 5
Autores: Populus, Jacques; Laurentin, Astrid; Rollet, Claire; Vasquez, Mickael; Guillaumont, Brigitte; Bonnot-courtois, Chantal.
This paper addresses the need for a finer description of coastal zone relief that is currently of interest for benthic habitat mapping. For example, the distribution of seaweed species in the tidal zone will mostly depend on the terrain's hypsometric level, slope and orientation. These parameters can be used in predictive distribution models, or more simply merged with 2.5/3D imagery to enhance interpretation. Since the required accuracy is of the order of 20-30 cm, two remote sensing techniques, lidar and photogrammetry, were examined and conditions for their application were assessed. Lidar surveys have been shown to provide such accuracy in all instances, whatever the substratum and vegetal cover type, as well as with the slope values currently...
Tipo: Text
Palavras-chave: Laser scanning; Benthos mapping; Photogrammetry; Coastal zone topography.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-2278.pdf

Evaluating the ecological status of cold-water coral habitats using non-invasive methods: An example from Cassidaigne canyon, northwestern Mediterranean Sea
Provedor de dados: 5
Autores: Fabri, Marie-claire; Vinha, Beatriz; Allais, Anne-gaelle; Bouhier, Marie-edith; Dugornay, Olivier; Gaillot, Arnaud; Arnaubec, Aurelien.
Cold-water coral ecosystems have been identified as vulnerable, but quantitative data on their conservation status is very limited. The Marine Strategy Framework Directive (MSFD) is the tool implemented by the European Union’s Integrated Maritime Policy to achieve Good Environmental Status (GES) of marine waters by 2020. In this context, the aim of this study was to evaluate the Ecological Status of benthic habitats in Cassidaigne canyon, focusing in particular on cold-water coral habitats dominated by Madrepora oculata. Data were collected during the Videocor1 cruise (2017). Videos and photos collected during eight dives of the H-ROV Ariane were used to reconstruct, in 3-dimensions, the areas where cnidarians have settled in the canyon. A total of 33 3D...
Tipo: Text
Palavras-chave: Biodiversity; Photogrammetry; Habitat mapping; Bauxite residues; Vulnerable marine ecosystems.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00511/62293/66719.pdf

Quantifying the shelter capacity of coral reefs using photogrammetric 3D modeling: From colonies to reefscapes
Provedor de dados: 5
Autores: Urbina-barreto, Isabel; Chiroleu, Frédéric; Pinel, Romain; Fréchon, Louis; Mahamadaly, Vincent; Elise, Simon; Kulbicki, Michel; Quod, Jean-pascal; Dutrieux, Eric; Garnier, Rémi; Henrich Bruggemann, J.; Penin, Lucie; Adjeroud, Mehdi.
Structural complexity plays a key role in the functioning of coral reef ecosystems. Reef-building corals are major contributors to this complexity, providing shelter and food for numerous invertebrates and fish species. Both structural complexity and shelter capacity of reefscapes are determined by several components such as spurs and grooves, slope, caves and holes, vegetation and coral colonies. Quantifying the shelter capacity from coral colonies to reefscapes is a fundamental step to estimating ecosystem potential to support biodiversity. Here, we applied underwater photogrammetry to quantify shelter volumes provided by individual coral colonies. Overall, 120 3D models of coral colonies from branching, massive, columnar and tabular growth forms were...
Tipo: Text
Palavras-chave: Coral reefs; Reef-building corals; Photogrammetry; 3D models; Predictive models; Shelter capacity; Structural complexity; Coral growth forms.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00659/77065/78372.pdf

Effects of Sand Addition and Bed Flushing on Gravel Bed Surface Microtopography and Roughness
Provedor de dados: 5
Autores: Bertin, Stephane; Friedrich, Heide.
Gravel riverbeds naturally present a range of sediment size that can span several orders of magnitude. However, fine sediment (i.e., size &lt;2 mm) additions affect sediment transport and are potentially harmful to the river ecology. Limited research has been done to understand the effects of sand addition on gravel bed topography. For this study, we conducted flume experiments testing the effectiveness of topography remote sensing to measure the response of a water-worked gravel bed to varying sand additions and bed flushing. Repeated measurements of the bed topography with through-water photogrammetry show that sand deposits primarily in low-lying areas of the bed, where it is sheltered. Observed changes in bed elevation standard deviation, skewness, and...
Tipo: Text
Palavras-chave: Gravel bed; Sand addition; Bed flushing; DEM; Roughness; Photogrammetry.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00637/74905/75969.pdf

COASTAL MAPPING AND KITESURFING
Provedor de dados: 5
Autores: Barde, J.; Bonhommeau, Sylvain; Chassot, E.; Motah, B.
ollecting data on aquatic biodiversity is very challenging because of the difficulty to access underwater ecosystems. Over the years, field surveys have become easier and cheaper with the development of low cost electronics. Commercial and recreational vessels, including sailboats, can now substantially complement expensive scientific surveys and arrays of observation buoys deployed across the world oceans (Pesant et al., 2015, Karsenti et al., 2011). Meanwhile, a large variety of marine animals such as birds, mammals, and fish have become data collection platforms for both biological and environmental parameters through the advent of archival tags. It becomes obvious that data collection in coastal and high seas will become more popular and that citizen...
Tipo: Text
Palavras-chave: Citizen science; Ocean and coastal observing systems; Surfing; Action cameras; Coral reef mapping; Photogrammetry; Deep learning; R.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00450/56164/57712.pdf

Photogrammetric discharge monitoring of small tropical mountain rivers: A case study at Riviere des Pluies, Reunion Island
Provedor de dados: 5
Autores: Stumpf, Andre; Augereau, Emmanuel; Delacourt, Christophe; Bonnier, Julien.
Reliable discharge measurements are indispensable for an effective management of natural water resources and floods. Limitations of classical current meter profiling and stage-discharge ratings have stimulated the development of more accurate and efficient gauging techniques such as nonintrusive photogrammetric techniques. Despite many successful applications of large-scale particle image velocimetry (LSPIV) for short-term measurements during flood events, there are still very few studies that address its use for long-term monitoring of small mountain rivers. To fill this gap, this study targets the development and testing of largely autonomous photogrammetric discharge measurement system with a special focus on the application to small mountain river with...
Tipo: Text
Palavras-chave: LSPIV; Discharge measurements; Tropical mountain catchment; Photogrammetry; Tropical cyclones; Torrential floods.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00639/75082/75606.pdf

Scale Accuracy Evaluation of Image-Based 3D Reconstruction Strategies Using Laser Photogrammetry
Provedor de dados: 5
Autores: Istenič, Klemen; Gracias, Nuno; Arnaubec, Aurelien; Escartín, Javier; Garcia, Rafael.
Rapid developments in the field of underwater photogrammetry have given scientists the ability to produce accurate 3-dimensional (3D) models which are now increasingly used in the representation and study of local areas of interest. This paper addresses the lack of systematic analysis of 3D reconstruction and navigation fusion strategies, as well as associated error evaluation of models produced at larger scales in GPS-denied environments using a monocular camera (often in deep sea scenarios). Based on our prior work on automatic scale estimation of Structure from Motion (SfM)-based 3D models using laser scalers, an automatic scale accuracy framework is presented. The confidence level for each of the scale error estimates is independently assessed through...
Tipo: Text
Palavras-chave: Photogrammetry; Metrology; Underwater 3D reconstruction; Structure-from-motion; Navigation fusion; Multiobjective BA; Laser scalers; Monte Carlo simulation; Uncertainty estimation; Scale drift evaluation; Laser spot detection.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00515/62643/67020.pdf

Automatic scale estimation of structure from motion based 3D models using laser scalers in underwater scenarios
Provedor de dados: 5
Autores: Istenič, Klemen; Gracias, Nuno; Arnaubec, Aurelien; Escartín, Javier; Garcia, Rafael.
Improvements in structure-from-motion techniques are enabling many scientific fields to benefit from the routine creation of detailed 3D models. However, for a large number of applications, only a single camera is available for the image acquisition, due to cost or space constraints in the survey platforms. Monocular structure-from-motion raises the issue of properly estimating the scale of the 3D models, in order to later use those models for metrology. The scale can be determined from the presence of visible objects of known dimensions, or from information on the magnitude of the camera motion provided by other sensors, such as GPS. This paper addresses the problem of accurately scaling 3D models created from monocular cameras in GPS-denied environments,...
Tipo: Text
Palavras-chave: Structure-from-motion; Underwater 3D reconstruction; Photogrammetry; Laser scalers.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00591/70338/68394.pdf

Sexual Dimorphism in the Nose Morphotype in Adult Chilean
Provedor de dados: 77
Autores: Troncoso Pazos,Jorge Andrés; Suazo Galdames,Iván Claudio; Cantín López,Mario; Zavando Matamata,Daniela Alejandra.
The nasal form is one of the most important aspects in assessing the facial aesthetics. Several authors have described changes in the form and nasal dimensions attributable to race and gender. The purpose of this study was to analyze the presence of sexual dimorphism in various morphometric parameters of the nose in a group of Chilean adults. This study involved 180 adults Chilean volunteers, 90 males and 90 females, between the age of 18 and 30 years which were conducted measurements of 12 parameters using indirect anthropometry, based on photographs from the front, profile and the nasal base, standardized, prosecuted through the program Corel Draw Graphics SuiteX3. Of the 12 dimensions nasal analyzed, significant differences were found between males and...
Tipo: Journal article
Palavras-chave: Nose; Sexual dimorphism; Rhinoplasty; Anthropometry; Photogrammetry.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000300005

Spatial and multi-temporal analysis of deforestation and quantification of the remnant forests on Porto Rico Island, Paraná, Brazil
Provedor de dados: 52
Autores: Campos,João Batista.
The process of land occupation by the state of Paraná practically decimated its forests. Presently, only 7% from a total area of 83.41% is covered by forests. Most of them are now concentrated in the "Serra do Mar" and in the Iguaçu National Park. With regard to forest cover the most critical region is situated in the northwestern of the state with less than 1% of its area covered by forest. This restricted area mainly consists of conservation units and the islands of the high Paraná River floodplain. The present study consists of a spatial and multi-temporal analysis of deforestation and the quantification of the remnant forests on Porto Rico island (22º45'S; 53º15'W), which have their occupation history linked to the colonization process of the region....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Photogrammetry; Alluvial forest; Floodplain; Forest.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131999000100013

Effect of image resolution manipulation in rearfoot angle measurements obtained with photogrammetry
Provedor de dados: 56
Autores: Sacco,I.C.N.; Picon,A.P.; Ribeiro,A.P.; Sartor,C.D.; Camargo-Junior,F.; Macedo,D.O.; Mori,E.T.T.; Monte,F.; Yamate,G.Y.; Neves,J.G.; Kondo,V.E.; Aliberti,S.
The aim of this study was to investigate the influence of image resolution manipulation on the photogrammetric measurement of the rearfoot static angle. The study design was that of a reliability study. We evaluated 19 healthy young adults (11 females and 8 males). The photographs were taken at 1536 pixels in the greatest dimension, resized into four different resolutions (1200, 768, 600, 384 pixels) and analyzed by three equally trained examiners on a 96-pixels per inch (ppi) screen. An experienced physiotherapist marked the anatomic landmarks of rearfoot static angles on two occasions within a 1-week interval. Three different examiners had marked angles on digital pictures. The systematic error and the smallest detectable difference were calculated from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Physical therapy modalities; Photogrammetry; Reliability; Rearfoot angle.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2012000900003