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| Bajjouk, Touria; Jauzein, Cecile; Drumetz, Lucas; Dalla Mura, Mauro; Duval, Audrey; Dubois, Stanislas. |
| Sabellaria alveolata is a sedentary gregarious tube-building species widely distributed from southwest Scotland to Morocco. This species builds what are currently considered the largest European biogenic reefs in the bay of Mont-Saint-Michel (France). As an ecosystem engineer, S. alveolata generates small to large scale topographic complexity, creating numerous spatial and trophic niches for other species to colonize. Sabellaria reefs are also under anthropogenic pressures, leading locally to massive degradation. However, stakeholders lack spatially explicit measures of reef ecological status, at adapted spatial resolution to provide key management information for this protected habitat. Traditional field surveys are extremely time-consuming and rely on... |
| Tipo: Text |
Palavras-chave: Benthic habitats; Biogenic reefs; Ecological status; Hyperspectral; Intertidal; Lidar; Mapping. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00654/76574/77710.pdf |
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| Populus, Jacques; Deshoux, Vincent. |
| Lever la topographie de la zone côtière à l’aide de la technique du télémètre laser (Lidar) aéroporté présente de multiples avantages par rapport aux méthodes classiques : la mesure est rapide, dense et précise, autorisant la cartographie du relief de zones d’estran difficilement accessibles aux moyens classiques. L’Ifremer et la Cellule de Mesures et de Bilans ont organisé en 2002 la couverture de plusieurs sites du littoral ouest de la France. La mise en oeuvre des levés et la validation des données sont rapidement exposés, ainsi que la précision que l’on peut en attendre, sur sol nu et végétation basse. Au plan des applications, la cartographie des habitats, objet du réseau "Réseau benthique" (Rebent, aujourd’hui opérationnel en Bretagne), utilise... |
| Tipo: Text |
Palavras-chave: Altimétrie; Bathymétrie; Lidar; Photogrammétrie; Littoral; Zone côtière; Marée; Modélisation hydrodynamique; MNT. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/00151/26251/24333.pdf |
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| Lagunas, Jose; Marec, Claudie; Leymarie, Edouard; Penkerc'H, Christophe; Rehm, Eric; Desaulniers, Pierre; Brousseau, Denis; Larochelle, Patrick; Roy, Gilles; Fournier, Georges; Thibault, Simon; Babin, Marcel. |
| The use of Lagrangian platforms and of Autonomous Underwater Vehicles (AUVs) in oceanography has increased rapidly over the last decade along with the development of improved biological and chemical sensors. These vehicles provide new spatial and temporal scales for observational studies of the ocean. They offer a broad range of deployment and recovery capabilities that reduce the need of large research vessels. This is especially true for ice-covered Arctic ocean where surface navigation is only possible during the summer period. Moreover, safe underwater navigation in icy waters requires the capability of detecting sea ice on the surface (ice sheets). AUVs navigating in such conditions risk collisions, RF communication shadowing, and being trapped by ice... |
| Tipo: Text |
Palavras-chave: Lidar; Polarization; Sea-ice; AUV; Argo; Arctic; Amundsen; Marine robotics. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00475/58665/61166.pdf |
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| Flamant, C; Pelon, J; Eymard, L; Tournadre, Jean. |
| [1] The Special Sensor Microwave Imager (SSM/I) integrated water vapor content (IWVC) estimates in a coastal region during nonstationary cold-air outbreak conditions are analyzed using IWVC retrievals obtained from shipborne microwave radiometry (DRAKKAR), water vapor differential absorption laser remote sensing (LEANDRE 2), radiosonde measurements, and numerical weather prediction (NWP) model ALADIN of Meteo-France. The study focuses on the 24 March 1998 Tramontane/Mistral event, which occurred over the Gulf of Lion (GoL) (western Mediterranean) in the framework of the flux, etat de mer et teledetection en condition de fetch variable (FETCH) experiment. Comparisons of SSM/I and ALADIN IWVCs with collocated shipborne microwave radiometry, at distances from... |
| Tipo: Text |
Palavras-chave: SSM/I; Lidar; Microwave radiometry; Integrated water vapor content; Mistral; FETCH. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00000/10184/7733.pdf |
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| PAPA, D. de A.; FIGUEIREDO, E. O.; OLIVEIRA, M. V. N. d'; RODRIGUEZ, L. C. E.; CAMARGO, A. P.; PRATA, G. A.; AMARAL, L. G. de C.; LARANJA, D. C. F.. |
| A segunda geração da tecnologia Modelo Digital de Exploração Florestal (Modeflora) utiliza-se de um sistema de sensoriamento remoto ativo de escaneamento a laser conhecido como LiDAR (Light Detection and Ranging). Esse equipamento emite radiação eletromagnética a um dado comprimento de onda, sob uma taxa de frequência de repetição para detecção de objetos. Ao ser atingido pelo laser, o alvo reflete a radiação e o equipamento LiDAR detecta o retorno do sinal refletido. Por meio das propriedades da luz refletida no objeto é possível fazer o cálculo da distância, entre o emissor e o objeto que refletiu o pulso, e dessa forma obter o posicionamento geográfico do alvo. |
| Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E) |
Palavras-chave: Geotécnica; Manejo florestal; Manejo de precisão; Manejo forestal.; Administração florestal; Sensoriamento remoto; Raio laser; Forest management; Remote sensing; Lidar; Lásers.. |
| Ano: 2017 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1078727 |
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