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Letteratura scientifica selezionata sul tema "Sentinel"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 7 luglio 2024

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Articoli di riviste sul tema "Sentinel"

Keeling, Matt J., Samik Datta, Daniel N. Franklin, Ivor Flatman, Andy Wattam, Mike Brown e Giles E. Budge. "Efficient use of sentinel sites: detection of invasive honeybee pests and diseases in the UK". Journal of The Royal Society Interface 14, n. 129 (aprile 2017): 20160908. http://dx.doi.org/10.1098/rsif.2016.0908.

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Sentinel sites, where problems can be identified early or investigated in detail, form an important part of planning for exotic disease outbreaks in humans, livestock and plants. Key questions are: how many sentinels are required, where should they be positioned and how effective are they at rapidly identifying new invasions? The sentinel apiary system for invasive honeybee pests and diseases illustrates the costs and benefits of such approaches. Here, we address these issues with two mathematical modelling approaches. The first approach is generic and uses probabilistic arguments to calculate the average number of affected sites when an outbreak is first detected, providing rapid and general insights that we have applied to a range of infectious diseases. The second approach uses a computationally intensive, stochastic, spatial model to simulate multiple outbreaks and to determine appropriate sentinel locations for UK apiaries. Both models quantify the anticipated increase in success of sentinel sites as their number increases and as non-sentinel sites become worse at detection; however, unexpectedly sentinels perform relatively better for faster growing outbreaks. Additionally, the spatial model allows us to quantify the substantial role that carefully positioned sentinels can play in the rapid detection of exotic invasions.

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Ridley, A. R., N. J. Raihani e M. B. V. Bell. "Experimental evidence that sentinel behaviour is affected by risk". Biology Letters 6, n. 4 (24 febbraio 2010): 445–48. http://dx.doi.org/10.1098/rsbl.2010.0023.

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Sentinels are a conspicuous feature of some cooperative societies and are often assumed to provide benefits in terms of increased predator detection. Similar to other cooperative behaviours, variation in investment in sentinel behaviour should reflect variation in the benefits of such behaviour. However, evidence for this is inconclusive: to date experiments have manipulated the cost of sentinel behaviour, and considerations of changes in the benefits of sentinel activity on investment patterns are lacking. Here, we experimentally manipulated the benefits of sentinel behaviour in the cooperatively breeding pied babbler ( Turdoides bicolor ) to assess whether this had any impact on sentinel activity. We simulated the presence of an unseen predator using playbacks of heterospecific alarm calls, and the presence of an actual predator using a model snake. In both cases, the increase in perceived predation risk caused an increase in sentinel activity, demonstrating that investment in sentinel activity increases when the benefits are greater.

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Ostreiher, Roni, e Aviad Heifetz. "The sentinel behaviour of Arabian babbler floaters". Royal Society Open Science 4, n. 2 (febbraio 2017): 160738. http://dx.doi.org/10.1098/rsos.160738.

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The sentinel behaviour of 38 Arabian babbler adult floaters, who lived alone within a territory belonging to a foreign group, was studied and compared with their own sentinel behaviour in the past, when they were group members. All floaters acted as sentinels and uttered ‘alarm calls’. This suggests that sentinel activity is due at least, in part, to selfish motives. Floaters sentinelled less than they did as group members, with the decrease in sentinel activity sharper for ex-dominants than for ex-subordinates. One possible explanation for these differences is that sentinel activity is aimed not only at detecting predators, but also at detecting foreign conspecifics. Within a group, the latter incentive is stronger for breeding dominants than for subordinates, whereas all floaters alike may be trying to detect the owners of the territory in which they were roaming but also to avoid being detected by them. Other possible explanations are that floaters have less time and energy for sentinel activity because they are weaker or because foraging is more difficult in a foreign territory. This may be especially so for dominants who used to enjoy privileged access to food in their group. No significant difference was found in the rate of sentinels' ‘alarm calls’ between floaters and group members, suggesting that their main purpose is predator–prey communication, of which warning groupmates may be a side benefit.

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RAGUSA-NETTO, J. "Sentinels in Saltator atricollis (Passeriformes: Emberizidae)". Revista Brasileira de Biologia 61, n. 2 (maggio 2001): 317–22. http://dx.doi.org/10.1590/s0034-71082001000200015.

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I studied the existence of sentinels in Saltator atricollis in a 'campo-cerrado' (Brazilian savanna) during the breeding seasons of 1994-95 and 1995-96. Groups of this species consisted of two to seven birds (N = 25). Sentinels were present (mean ± sd) 62% ± 9% of the time, and most sentinel bouts lasted from less than one to six minutes (although in some occasions for more than 30 min.). Overlap of two or more sentinels occurred on average only 3.2% of the time with birds on guard. Sentinels commonly gave contact calls in the beginning and/or at the end of a sentinel bout. The group size had no effect on time with sentinels. However the encounter rate between raptors and groups significantly influenced the time guarded. The results of this study suggests that the ability of sentinels to detect predators may play a central role as an anti-predator device.

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Racloz, V., C. Griot e K. D. C. Stärk. "Sentinel surveillance systems with special focus on vector-borne diseases". Animal Health Research Reviews 7, n. 1-2 (giugno 2006): 71–79. http://dx.doi.org/10.1017/s1466252307001120.

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In the past few decades, vector-borne diseases have been spreading into countries previously free of these agents. It is necessary for a surveillance method to be tailored to the biology of these agents in order to detect their incursion. Using a sentinel herd system, it is possible to target high-risk areas where occurrence is most probably due to vector presence. Since the 1970s, diseases such as Akabane, vesicular stomatitis and Bluetongue disease have successfully been monitored using cattle herds as sentinels in many countries such as Saudi Arabia, Australia, China, Indonesia, Sultanate of Oman and most recently in countries in Western Europe. This paper reviews the strengths and weaknesses of sentinel herd surveillance systems in general. In order to determine their efficacy, the following criteria were found to be essential: the choice of sentinel locations, sentinel animal, seasonality of sampling and diagnostic testing methods. We conclude that due to its ability to focus on a specific disease, sentinel herd systems have been successful in the early detection of the spread of a targeted agent. This review is used as a basis for recommendations for the development of future sentinel herd systems.

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Zaias, Julia, Catia Farrington, Robert S. Livingston e Linda W. Waterman. "Seroconversion of 1-year-old Mice to Murine Norovirus". Journal of the American Association for Laboratory Animal Science 58, n. 2 (1 marzo 2019): 197–200. http://dx.doi.org/10.30802/aalas-jaalas-18-000054.

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Rodent sentinel screening for adventitious pathogens is an integral part of many biomedical research institutes and universities that use rodents in research. Typical screening programs involving live sentinel animals typically purchase young SPF sentinel animals that are sampled and replaced quarterly. Previous reports suggest that mice as old as 6 mo are effective sentinels for various agents. In efforts to reduce the number of animals used in our sentinel program, we wanted to investigate the possibility of keeping sentinel animals inhouse for 12 mo at a time. We exposed mice (age, 40 to 48 wk) to murine norovirus (MNV) to test whether they could reliably produce detectable levels of antibodies (similar to younger mice) to this adventitious pathogen. Mice first exposed to MNV at 40 to 48 wk of age seroconverted to MNV after both direct inoculation (through gavage) and indirect exposure (from soiled-bedding transfer) at the same or greater frequency than mice first exposed at 8 to 12 wk of age. These findings indicate that, at least for MNV, sentinel residence time can be extended from 3 to 12 mo without compromising the reliability of seroconversion, thus ultimately reducing sentinel animal numbers. This practice, combined with nonanimal testing modalities (for example, exhaust duct sampling), can increase the sensitivity and specificity of rodent surveillance programs and minimize the use of live animals.

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Tarpanelli, Angelica, Alessandro C. Mondini e Stefania Camici. "Effectiveness of Sentinel-1 and Sentinel-2 for flood detection assessment in Europe". Natural Hazards and Earth System Sciences 22, n. 8 (2 agosto 2022): 2473–89. http://dx.doi.org/10.5194/nhess-22-2473-2022.

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Abstract. Inundation is one of the major natural hazards in Europe. The evaluation of the flood hazard and risk is not straightforward mainly due to the monitoring system that is poor or not uniformly distributed in the territory. The ESA Earth Observation Program, including a series of satellites, Sentinels, for the operative observation of the natural phenomenon, e.g. the inundations, can potentially reduce the gap. Sentinel-1 (SAR: synthetic aperture radar) and Sentinel-2 (optical) have been demonstrated to be suitable for mapping flooded areas, but despite the medium–high spatial and temporal resolution of the sensors, the mapping of inundated territories is often partial or missing. The objective of this study is to evaluate through a synthetic study the effectiveness of Sentinel-1 and Sentinel-2 in the systematic assessment of floods in Europe, where the flood events have durations ranging from some hours to a few days. To reach the target, we analysed 10 years of river discharge data over almost 2000 sites in Europe, and we extracted flood events over some established thresholds as proxies of riverine inundations. Based on the revisit time of the satellite constellations and cloud coverage, we derived the percentage of potential inundation events that Sentinel-1 and Sentinel-2 could be able to observe. Results show that assuming the configuration of a constellation of two satellites for each mission and considering the ascending and descending orbit, on average 58 % of flood events are potentially observable by Sentinel-1 and only 28 % by Sentinel-2 due to the cloud coverage.

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Lepitzki, Dwayne A. W., Marilyn E. Scott e J. Daniel McLaughlin. "Assessing cercarial transmission of Cyathocotyle bushiensis and Sphaeridiotrema pseudoglobulus by use of sentinel snails". Canadian Journal of Zoology 72, n. 5 (1 maggio 1994): 885–91. http://dx.doi.org/10.1139/z94-120.

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Sentinel snails (Bithynia tentaculata) were used to assess spatial and temporal variation in cercarial transmission of Cyathocotyle bushiensis and Sphaeridiotrema pseudoglobulus at two field locations in southern Quebec and southeastern Ontario from mid-August to the end of October, 1989. Sentinels acquired infections with both digeneans; however, low levels of metacercariae of C. bushiensis precluded any conclusions regarding transmission of this parasite from being reached. In contrast, extensive spatial heterogeneity existed in the S. pseudoglobulus – snail system. Sentinel snails within 10 m of each other were apparently exposed to vastly different levels of naturally occurring cercariae. All size classes of sentinels were apparently equally susceptible to cercarial infections but no consistent temporal differences in infection levels were found.

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Wang, S., B. Yang, Y. Zhou, F. Wang, R. Zhang e Q. Zhao. "SNOW COVER MAPPING AND ICE AVALANCHE MONITORING FROM THE SATELLITE DATA OF THE SENTINELS". ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-3 (30 aprile 2018): 1765–72. http://dx.doi.org/10.5194/isprs-archives-xlii-3-1765-2018.

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In order to monitor ice avalanches efficiently under disaster emergency conditions, a snow cover mapping method based on the satellite data of the Sentinels is proposed, in which the coherence and backscattering coefficient image of Synthetic Aperture Radar (SAR) data (Sentinel-1) is combined with the atmospheric correction result of multispectral data (Sentinel-2). The coherence image of the Sentinel-1 data could be segmented by a certain threshold to map snow cover, with the water bodies extracted from the backscattering coefficient image and removed from the coherence segment result. A snow confidence map from Sentinel-2 was used to map the snow cover, in which the confidence values of the snow cover were relatively high. The method can make full use of the acquired SAR image and multispectral image under emergency conditions, and the application potential of Sentinel data in the field of snow cover mapping is exploited. The monitoring frequency can be ensured because the areas obscured by thick clouds are remedied in the monitoring results. The Kappa coefficient of the monitoring results is 0.946, and the data processing time is less than 2&thinsp;h, which meet the requirements of disaster emergency monitoring.

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Pla, Magda, Gerard Bota, Andrea Duane, Jaume Balagué, Antoni Curcó, Ricard Gutiérrez e Lluís Brotons. "Calibrating Sentinel-2 Imagery with Multispectral UAV Derived Information to Quantify Damages in Mediterranean Rice Crops Caused by Western Swamphen (Porphyrio porphyrio)". Drones 3, n. 2 (21 maggio 2019): 45. http://dx.doi.org/10.3390/drones3020045.

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Making agricultural production compatible with the conservation of biological diversity is a priority in areas in which human–wildlife conflicts arise. The threatened Western Swamphen (Porphyrio porphyrio) feeds on rice, inducing crop damage and leading to decreases in rice production. Due to the Swamphen protection status, economic compensation policies have been put in place to compensate farmers for these damages, thus requiring an accurate, quantitative, and cost-effective evaluation of rice crop losses over large territories. We used information captured from a UAV (Unmanned Aerial Vehicle) equipped with a multispectral Parrot SEQUOIA camera as ground-truth information to calibrate Sentinel-2 imagery to quantify damages in the region of Ebro Delta, western Mediterranean. UAV vegetation index NDVI (Normalized Difference Vegetation Index) allowed estimation of damages in rice crops at 10 cm pixel resolution by discriminating no-green vegetation pixels. Once co-registered with Sentinel grid, we predicted the UAV damage proportion at a 10 m resolution as a function of Sentinel-2 NDVI, and then we extrapolated the fitted model to the whole Sentinel-2 Ebro Delta image. Finally, the damage predicted with Sentinel-2 data was quantified at the agricultural plot level and validated with field information compiled on the ground by Rangers Service. We found that Sentinel2-NDVI data explained up to 57% of damage reported with UAV. The final validation with Rangers Service data pointed out some limitations in our procedure that leads the way to improving future development. Sentinel2 imagery calibrated with UAV information proved to be a viable and cost-efficient alternative to quantify damages in rice crops at large scales.

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Tesi sul tema "Sentinel"

Merlin, Bailey. "Sentinel". Digital Commons @ Butler University, 2017. https://digitalcommons.butler.edu/grtheses/496.

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Devastated by the mysterious death of her guardians, Elizabeth Davenport finds herself thrust into a new world that proves to be scintillating and dangerous. Can she trust those who claim to be her friends? Or will her trust lead her into trouble? When a mysterious letter presents itself and proves that her guardians might have been more than they ever let on, Elizabeth must gather her courage and pursue the truth, whatever the cost.

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Halliday, J. E. B. "Animal sentinel surveillance : evaluating domestic dogs as sentinels for zoonotic pathogen surveillance". Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4794.

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The capacity of zoonotic pathogens to infect multiple hosts creates surveillance challenges but also provides opportunities to gather data from animal species that can be used to understand risks to human health. This thesis presents a conceptual and practical assessment of the utility of domestic dog serosurveillance for the detection and surveillance of two pathogens, influenza A and Leptospira spp. The first chapter gives a theoretical framework that can be used to explore the attributes of animal sentinels and assess their utility in different contexts. In subsequent chapters, this framework is applied in a practical assessment of the utility of a domestic dog serosurveillance approach for the detection and surveillance influenza A and Leptospira spp. at two sites in Africa. Two cross-sectional surveys of the avian and mammal populations at a site in Northern Cameroon were conducted in early 2006 to determine if H5N1 influenza A viruses had circulated in this area and in which species that presence could be detected. Serological and molecular evidence of extensive H5 virus circulation in the domestic duck population was identified. 47% of domestic ducks at the Maga site were cELISA positive for anti-influenza A antibodies and 20% were HI test positive against an H5N1 antigen. There was also evidence of exposure to H5 subtype viruses in the local dog and pig populations. At the Kibera site in Nairobi, a cohort study was established to carry out surveillance of influenza A and Leptospira spp. in the domestic dog population and cross-sectional surveys of the domestic poultry and rodent populations were completed. There was no indication of influenza A circulation in any of the animal species surveyed, indicating low risk of zoonotic influenza A infection in the human population of Kibera. In contrast, there was extensive molecular and serological evidence of the presence of Leptospira spp. in both the rodent and dog populations. 18% of 236 trapped rodents were PCR positive for kidney carriage of pathogenic leptospires and the estimated seroprevalence of anti- Leptospira antibodies in the dog population ranged from 5-36% during the course of the study, indicating high potential risk of leptospirosis infection in the human population. The results indicate that dog serosurveillance can be used as useful tool for the determination of broad-scale patterns of pathogen presence and relative levels of population exposure. However, there are limitations of the data that can be gathered from animal sentinels and the complexities introduced particularly by incomplete understanding of diagnostic test performance must be recognized. Animal sentinel surveillance may be of most use for addressing fundamental questions of what pathogens are present where. In the developing world particularly where disease burden data are still lacking, dog sentinel serosurveillance can provide essential baseline data that can be used to target future research and resource allocation.

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Peres, Gabriel. "Biópsia de linfonodo sentinela na recidiva locorregional do melanoma maligno revisão sistemática /". Botucatu, 2020. http://hdl.handle.net/11449/191662.

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Orientador: Antônio José Maria Cataneo
Resumo: Introdução: No melanoma primário, a aplicabilidade da biópsia de linfonodo sentinela (BLS), seguida ou não de esvazimento linfonodal (EL) é conhecida. Na recidiva locorregional (RL) de melanoma, alguns serviços tendem a indicá-la, buscando estadiamento mais acurado para embasar condutas individualizadas aos pacientes, ainda que as evidências sejam insuficientes. Objetivo: Avaliar o sucesso da BLS no encontro do linfonodo sentinela (LNS) e sua positividade na RL. Comparar a sobrevida entre os pacientes com LNS positivo e negativo. Verificar diferença na sobrevida pós EL. Métodos: Revisão sistemática, através das bases MEDLINE via PUBMED, LILACS, SCOPUS, EMBASE e CENTRAL, buscando estudos experimentais e observacionais sobre BLS na RL de melanoma. Desfechos avaliados: sucesso na BLS pelo encontro do LNS, positividade para melanoma no LNS; sobrevida no subgrupo LNS positivo comparado com o negativo; sobrevida livre de doença no subgrupo LNS positivo comparada com o negativo; sobrevida dos pacientes submetidos ao EL. Para metanálises, utilizaram-se RevMan 5.3 e StatsDirect 3.0.121. Resultados: Foram identificados 1872 estudos, destes, seis estudos observacionais foram incluídos, totalizando 449 pacientes. O LNS foi encontrado em 98% das BLS (IC 95-100%, I2=53,7% - seis estudos). LNS com 32% de positividade para melanoma (IC 19-47%, I2= 84,6% - seis estudos). A chance de sobrevida global em cinco anos foi 2,49 vezes maior no subgrupo com LNS negativo (IC 95% 1,41-4,38, I2=0% - qua... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Background: In primary melanoma, the applicability of sentinel lymph node biopsy (SLB), followed or not by complete lymph node dissection (CLND) is known. In locoregional recurrence (LR) of melanoma, some groups may indicate it for more accurate staging to support individualized management, even with scarce evidence. Objective: To evaluate success in SLB and its positivity in LR. Compare survival between patients with positive and negative sentinel lymph node (SLN). Check for survival modification after CLND. Methods: Systematic review through databases such as MEDLINE via PUBMED, LILACS, SCOPUS, EMBASE and CENTRAL, searching for experimental and observational studies on SLB in melanoma LR. Outcomes assessed: success in SLB by finding the SLN, positivity for melanoma in the SLN; survival in the positive SLN subgroup compared to the negative one; disease-free survival in the positive versus negative SLN subgroup; survival of patients undergoing CLND. For meta-analyzes, RevMan 5.3 and StatsDirect 3.0.121 were used. Results: The total number of patients in six observational studies was 449, over 1872 studies indentified. The SNL was found in 98% of SLB (95-100% CI, I2 = 53.7%, 6 studies). SLB detected 32% positivity for melanoma on SNL (CI 19-47%, I2 = 84.6%, 6 studies). The chance of five year overall survival was 2,49 higher in the negative SNL subgroup (95% CI 1.41-4.38, I2 = 0%, 4 studies). Meta-analyzes were not performed due to lack of objective data for disease-free survi... (Complete abstract click electronic access below)
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Karlsson, Mona. "Sentinel node based immunotherapy of cancer /". Stockholm, 2007. http://diss.kib.ki.se/2007/978-91-7357-203-3/.

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Rogers, Clare Elizabeth. "Sentinel node biopsy in breast cancer". Thesis, University of Hull, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.403680.

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Anninga, Bauke. "Magnetic identification of sentinel lymph nodes". Thesis, King's College London (University of London), 2017. https://kclpure.kcl.ac.uk/portal/en/theses/magnetic-identification-of-sentinel-lymph-nodes(48d202b4-345a-4386-91d3-dac9686e73ef).html.

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Sentinel lymph node biopsy (SLNB) is currently performed using radioisotope and blue dye injections. Drawbacks to using radioisotopes include exposure to radiation, limited global availability and a short half-life. A newly developed magnetic technique for identification of sentinel lymph nodes (SLNs) can overcome these problems. The magnetic technique is nonradioactive as it uses iron oxide particles as a magnetic tracer. The tracer causes a brown colour change in the SLN, which is visualised at surgery and it can be localised intraoperatively using a handheld magnetometer. The aims of this thesis were to evaluate multiple parameters of the magnetic technique using an animal model and to test the feasibility of this technique to identify the SLN(s) in melanoma. In addition, the imaging characteristics of magnetic tracers were investigated, including pre-operative lymphatic staging and postoperative effects of the injection of the magnetic tracer on MRI. A porcine animal model was used to test the magnetic technique and a total of 92 magnetic SLNB procedures were performed in 46 mini-pigs. A range of injected volumes, from 0.06 mL to 2.0 mL, was tested. Histological assessment, magnetic counts, iron content, concentration and time elapse since injections were evaluated. The technique was successfully applied to the porcine model, as evidenced by a 100% identification of the SLN(s) (92/92). The magnetic technique was successful using volumes of as low as 0.06 mL and magnetic tracer was taken up in the SLN(s) within minutes. The MELAMAG trial of the magnetic technique in melanoma, reported in this thesis, evaluated SLN identification rate per patient, with the radioisotope/blue dye and magnetic techniques. The magnetic technique was found to be feasible for SLNB in melanoma with a high SLN identification rate. The magnetic iron oxide tracer can be used as contrast agent for MRI with high sensitivity and specificity for lymphatic staging. This thesis includes a meta-analysis of contrast enhanced MRI for axillary staging in early breast cancer. Is also includes and investigation of the susceptibility artefact of magnetic tracer in the breast following SLN identification using the magnetic technique and it reports its potential impact on subsequent MRI scans.

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Henzel, Maja [Verfasser], e Tanja [Akademischer Betreuer] Fehm. "Prädiktion von Non-Sentinel-Lymphknotenmetastasen bei Mammakarzinompatientinnen mit positivem Sentinel-Lymphknoten durch Nomogramme / Maja Henzel ; Betreuer: Tanja Fehm". Tübingen : Universitätsbibliothek Tübingen, 2017. http://d-nb.info/1199468711/34.

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Kuehn, Aida. "Sentinel-Lymphknotenbiopsie nach neoadjuvanter Chemotherapie beim Mammakarzinom". Diss., lmu, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-143829.

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Lundberg, Ludvig. "Damage Assessment of Mozambique Flooding Using Sentinel". Thesis, KTH, Geoinformatik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-272396.

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In the past 40 years, floods have become a bane of Mozambique’s inhabitants and economy. The latest of them, caused by the cyclone Idai, has devastated the area resulting in loss of life and property. It was estimated that around 715 000 hectares of farmland was destroyed as a result of the cyclone. The main goal of this thesis was to assess the extent of the flooding and to determine the types of land cover that were affected. This was done in Google Earth Engine, using SAR change detection on Sentinel 1 data to create a mask for the flooded areas, followed by a supervised image classification on Sentinel 2 data to identify the types of land cover that were flooded. Two classifications were done, using imagery from early periods of the country’s plant growing season and later periods of the same season, respectively. The results of both classifications were below standard, with the main problems stemming from difficulties with differentiating between agriculture and roads along with agriculture and vegetation. Multiple ways to improve the results and avoid the errors in future similar projects were discussed, including using multi temporal data and utilizing a road map for the area to create a large amount of training points for the classification. In conclusion, while the results were not as good as was envisioned, the thesis provided ample opportunity to analyze errors and to theorize methods for improving future work.

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Cavonius, Johansson Hanna, e Jens Henriksson. "Skattning av skogliga variabler genom satellitbilder från Sentinel 2 : Estimation of forest variables using satellite images from Sentinel 2". Thesis, Linnéuniversitetet, Institutionen för skog och träteknik (SOT), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-94004.

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Stora arealer skog behöver övervakas. Att göra detta på ett kostnadseffektivt sätt är något som skogssektorn efterfrågar. Syftet med studien var att undersöka möjligheten att skatta skogliga variabler med satellitbilder från Sentinel 2. Korrelationen mellan granskogens uppmätta reflektans i satellitbilder från Sentinel 2 och uppmätta variablerna i fält har beräknats och analyserats. Resultatet visar att styrkan i korrelation skiljer sig mellan olika rumsliga upplösningar, vilken tid på året satellitbilderna är tagna, vilka spektrala band och vegetationsindex som används samt vilka skogliga variabler som avses uppskattas. Att använda enskilda satellitbilders värden från Sentinel 2 ger inte tillräckligt tillförlitliga data för att uppskatta skogliga variabler.

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Libri sul tema "Sentinel"

Robert, Hunter. Sentinel. New York: Penguin Books, 1993.

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Udon, a cura di. Sentinel. Edina, Minn: Spotlight, 2007.

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Muzzin, Tyler. Sentinel. Palermo]: 89books, 2019.

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Hunter, Robert. Sentinel. New York: Penguin Books, 1993.

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Sentinel. Princeton NJ: Red Dashboard, 2016.

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Sentinel: The Fifth Covenant Novel. Contoocook, NH: Spencer Hill Press, 2013.

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Sentinel. Leicester: Charnwood, 2014.

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Clarke, Arthur C. The sentinel. New York: Barnes & Noble, 1996.

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The sentinel. New York: HarperPrism, 1996.

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Oldfield, Mark. The sentinel. London: Head of Zeus, 2013.

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Capitoli di libri sul tema "Sentinel"

Weik, Martin H. "sentinel". In Computer Science and Communications Dictionary, 1548. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_16971.

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Cserni, Gábor. "Sentinel Node". In Breast Pathology, 355–62. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-62539-3_4692.

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Cserni, Gábor. "Sentinel Node". In Encyclopedia of Pathology, 1–7. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-28845-1_4692-1.

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Winqvist, Ola, e Magnus Thörn. "Sentinel Node". In Encyclopedia of Cancer, 1–4. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-27841-9_5243-2.

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Mehlhorn, Heinz. "Sentinel Animal". In Encyclopedia of Parasitology, 2497. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-43978-4_4318.

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Mehlhorn, Heinz. "Sentinel Animal". In Encyclopedia of Parasitology, 1. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-27769-6_4318-1.

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Heppner, John B., David B. Richman, Steven E. Naranjo, Dale Habeck, Christopher Asaro, Jean-Luc Boevé, Johann Baumgärtner et al. "Sentinel Host". In Encyclopedia of Entomology, 3344–45. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6359-6_4130.

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Winqvist, Ola, e Magnus Thörn. "Sentinel Node". In Encyclopedia of Cancer, 4181–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-46875-3_5243.

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"Prologue". In Sentinel, 1–12. Harvard University Press, 2018. http://dx.doi.org/10.4159/9780674916333-001.

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"1. Sea-Bound Comet". In Sentinel, 13–46. Harvard University Press, 2018. http://dx.doi.org/10.4159/9780674916333-002.

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Atti di convegni sul tema "Sentinel"

Balaji, Bharathan, Jian Xu, Anthony Nwokafor, Rajesh Gupta e Yuvraj Agarwal. "Sentinel". In the 11th ACM Conference. New York, New York, USA: ACM Press, 2013. http://dx.doi.org/10.1145/2517351.2517370.

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Chakravarthy, S. "Sentinel". In the 1997 ACM SIGMOD international conference. New York, New York, USA: ACM Press, 1997. http://dx.doi.org/10.1145/253260.253409.

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Li, Xiaowei, Wei Yan e Yuan Xue. "SENTINEL". In the second ACM conference. New York, New York, USA: ACM Press, 2012. http://dx.doi.org/10.1145/2133601.2133605.

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Cosson, Adrien, Amit Kumar Sikder, Leonardo Babun, Z. Berkay Celik, Patrick McDaniel e A. Selcuk Uluagac. "Sentinel". In IoTDI '21: International Conference on Internet-of-Things Design and Implementation. New York, NY, USA: ACM, 2021. http://dx.doi.org/10.1145/3450268.3453533.

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Constantinescu, Cornel, e Sangeetha Seshadri. "Sentinel". In SYSTOR '21: The 14th ACM International Systems and Storage Conference. New York, NY, USA: ACM, 2021. http://dx.doi.org/10.1145/3456727.3463834.

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Pedrinaci, Carlos, Dave Lambert, Branimir Wetzstein, Tammo van Lessen, Luchesar Cekov e Marin Dimitrov. "SENTINEL". In the first international workshop. New York, New York, USA: ACM Press, 2008. http://dx.doi.org/10.1145/1452567.1452568.

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Hattori, Joe, e Shinpei Kato. "Sentinel". In Middleware '22: 23rd International Middleware Conference. New York, NY, USA: ACM, 2022. http://dx.doi.org/10.1145/3565382.3565880.

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Snoeij, Paul, Mike Brown, Malcolm Davidson, Bjorn Rommen, Nicolas Floury, Dirk Geudtner e Ramon Torres. "Sentinel-1A and Sentinel-1B CSAR status". In SPIE Remote Sensing. SPIE, 2011. http://dx.doi.org/10.1117/12.898646.

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Plutalova, T. G., K. Teshebaeva, D. N. Balykin, A. V. Puzanov, Ja v. Huissteden, M. I. Koveshnikov, O. V. Lovtskaya e N. M. Kovalevskaya. "Central Yamal vegetation monitoring based on Sentinel-2 and Sentinel-1 imagery". In Spatial Data Processing for Monitoring of Natural and Anthropogenic Processes 2021. Crossref, 2021. http://dx.doi.org/10.25743/sdm.2021.18.29.040.

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Abstract (sommario):

In this study fusion of optical (Sentinel-2) and radar (Sentinel-1) imagery is presented for vegetation cover classification in polar Arctic environment of the Western Siberia. Sentinel-1 and Sentinel-2 images were analyzed using parametric rule classification. Results showed significantly improved land cover classification results based on contextual analysis. Synergy of Sentinel-2 bands 4 and 3 and Sentinel-1 dual polarization VV and VH images increased the classification accuracy significantly. Specifically, classification accuracy increased for two classes — Erect dwarf-shrub tundra with 6% and Fresh Water with 10%. The classification accuracy as well test sites were analyzed using in situ data collected during three fieldwork campaigns in August-September (2016–2018) in the surrounding of Bovanenkovo settlement.

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Benveniste, Jérôme. "Proceedings of the Sentinel-3 for Science Workshop". In Sentinel-3 for Science Worksho. ESA, 2015. http://dx.doi.org/10.5270/esa.sp-734.sentinel-3-2015-proc.

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Rapporti di organizzazioni sul tema "Sentinel"

Ling, Alice V., András Vládar, Bradley N. Damazo, M. Alkan Donmez e Michael T. Postek. SEM Sentinel:. Gaithersburg, MD: National Institute of Standards and Technology, 2000. http://dx.doi.org/10.6028/nist.ir.6498.

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Sutton, Richard. Sentinel Lymph Node Biopsy. Touch Surgery Simulations, ottobre 2014. http://dx.doi.org/10.18556/touchsurgery/2014.s0033.

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von Qualen, Ralph, e Xiao-Bing Yang. Asian Soybean Rust Sentinel Plots. Ames: Iowa State University, Digital Repository, 2006. http://dx.doi.org/10.31274/farmprogressreports-180814-1149.

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von Qualen, Ralph, e Xiao-Bing Yang. Asian Soybean Rust Sentinel Plots. Ames: Iowa State University, Digital Repository, 2006. http://dx.doi.org/10.31274/farmprogressreports-180814-1785.

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von Qualen, Ralph, e Xiao-Bing Yang. Asian Soybean Rust Sentinel Plots. Ames: Iowa State University, Digital Repository, 2006. http://dx.doi.org/10.31274/farmprogressreports-180814-241.

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von Qualen, Ralph, e Xiao-Bing Yang. Asian Soybean Rust Sentinel Plots. Ames: Iowa State University, Digital Repository, 2006. http://dx.doi.org/10.31274/farmprogressreports-180814-2575.

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von Qualen, Ralph, e Xiao-Bing Yang. Asian Soybean Rust Sentinel Plots. Ames: Iowa State University, Digital Repository, 2006. http://dx.doi.org/10.31274/farmprogressreports-180814-518.

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von Qualen, Ralph, e Xiao-Bing Yang. Asian Soybean Rust Sentinel Plots. Ames: Iowa State University, Digital Repository, 2006. http://dx.doi.org/10.31274/farmprogressreports-180814-762.

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von Qualen, Ralph, e Xiao-Bing Yang. Asian Soybean Rust Sentinel Plots. Ames: Iowa State University, Digital Repository, 2006. http://dx.doi.org/10.31274/farmprogressreports-180814-943.

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Greene, Carmen M., John N. Aarsvold e Nolan Hertel. Intraoperative Imaging for Sentinel Lymph Nodes. Fort Belvoir, VA: Defense Technical Information Center, agosto 2004. http://dx.doi.org/10.21236/ada433043.

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