Producción de ortofotos históricas para la generación de base de datos temáticas. Cartografía de usos y cobertura del suelo. REDIAM

Con objeto de dotar de una base de información multitemporal a la Infraestructura de Información Ambiental de Andalucía y en especial la cartografía de Usos y Coberturas Vegetales del Suelo, es necesario partir de la información histórica disponible y concretamente de los vuelos fotogramétricos históricos a partir de los cuales generar las Bases de Referencia Territoriales Históricas. Para ello, desde la Red de Información Ambiental de Andalucía (Rediam) se ha llevado a cabo la ortorrectificación de vuelos con cobertura completa regional: Vuelo americano de 1956; Vuelo Interministerial de 1977-78 (comúnmente denominado IRYDA) y Vuelo General de 1984-85. Este artículo describe el proceso y metodología desarrollados para la obtención de Bases de Referencia a partir de la ortorrectificación de varios vuelos de todo el ámbito regional, cuyo desarrollo tiene ciertas variaciones respecto al proceso fotogramétrico clásico debido a que se trata de documentación histórica. Los productos obtenidos se integran en el Catálogo de Información Ambiental para su aplicación directa en la obtención de cartografía temática y su difusión a través del Canal de la Red de Información Ambiental de Andalucía: Servicios OGC (WMS), Visor de Descargas de Imágenes del territorio,…Historical photogrammetric flights, which were used to generate historical reference maps, have been used in order to add multitemporal information to Infraestructure for Environment Information in Andalusia and especially to the cartography about land covers and uses. The Andalusian Environmental Information Network (Rediam) has carried out the orthorectification of whole regional coverage flights: the American flight (1956), the Inter-ministerial or IRYDA flight (1977-78) and the General Flight of Spain (1984-85). This paper describes the process and methodology developed to obtain reference maps from the orthorectification of different whole regional coverage flights. The process is different from the classic photogrammetric process given that historical documentation is used.The final products have been integrated in the Environmental Information Catalog for their straight application in the obtaining of thematic cartography and their diffusion through the Andalusian Environmental Information Network Channel: OGC Services (WMS), territorial information viewers,

Use of UAVs for fauna detection as support of hunting census. REDIAM

Revista oficial de la Asociación Española de Teledetección[EN] The following paper details the methodology for analyzing the potential of Unmanned Aerial Vehicles (UAV) as suitable observation platforms for obtaining thermal images of hunting areas, and for the estimation of number of individuals for these populations (fauna, in this case deer). Due to limitations detected in the initial information, some of the work stages are alternative approaches to an optimal process. On this basis, specific technical flight requirements are proposed in order to carry out a more appropriate analysis.[ES] El presente trabajo presenta la metodología seguida para el análisis de la potencialidad de los vehículos no tripulados (UAV) como plataformas de observación adecuadas para la adquisición de imágenes térmicas sobre ámbitos cinegéticos, y la estimación de individuos de estas poblaciones (fauna, en este caso venados). Debido a limitaciones detectadas en la información de partida, algunas fases del trabajo son aproximaciones alternativas a un proceso óptimo. En base a esto, se plantean requerimientos técnicos específicos a los vuelos de cara a realizar un análisis más adecuado.Agradecimiento a ELIMCO SISTEMAS por aportar el vuelo y la información de partida: imágenes y datos adquiridos y a la unidad de I+D+i de la Agencia de Medio Ambiente y Agua por el interés en el desarrollo de aplicaciones de los UAV como soporte a la gestión ambiental.Prieto Molina, R.; Méndez, E.; Vales, J.; Pino, I.; Carpintero, I.; Granado, L.; Montoya, G.... (2014). Aplicación de UAVS a la detección de fauna como soporte a los censos cinegéticos. REDIAM. Revista de Teledetección. (41):121-131. doi:10.4995/raet.2014.2312.SWORD12113141Kissell, R.E., Tappe, P.A. & Gregory, S.K. 2004. Assessment of population estimators using aerial thermal infrarred Videography data. Lakeside Farms, Wingmead Farms, Inc. and the Arkansas Game and Fish Commission.Naugle, D.E; Jenks, J.A. & Kernohan, B.J, 1996. Use of thermal infrared sensing to estimate density of white-tailed deer. Wildlife Society Bulletin, 24 (1), 37-43.Wilde, R.H. & Trotter, C.M. 1999. Detection of Himalayan thar using a thermal infrared camera. Arkansas Game and Fish Commissio

Search for direct production of charginos and neutralinos in events with three leptons and missing transverse momentum in √s = 7 TeV pp collisions with the ATLAS detector

A search for the direct production of charginos and neutralinos in final states with three electrons or muons and missing transverse momentum is presented. The analysis is based on 4.7 fb−1 of proton–proton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with Standard Model expectations in three signal regions that are either depleted or enriched in Z-boson decays. Upper limits at 95% confidence level are set in R-parity conserving phenomenological minimal supersymmetric models and in simplified models, significantly extending previous results

Jet size dependence of single jet suppression in lead-lead collisions at sqrt(s(NN)) = 2.76 TeV with the ATLAS detector at the LHC

Measurements of inclusive jet suppression in heavy ion collisions at the LHC provide direct sensitivity to the physics of jet quenching. In a sample of lead-lead collisions at sqrt(s) = 2.76 TeV corresponding to an integrated luminosity of approximately 7 inverse microbarns, ATLAS has measured jets with a calorimeter over the pseudorapidity interval |eta| < 2.1 and over the transverse momentum range 38 < pT < 210 GeV. Jets were reconstructed using the anti-kt algorithm with values for the distance parameter that determines the nominal jet radius of R = 0.2, 0.3, 0.4 and 0.5. The centrality dependence of the jet yield is characterized by the jet "central-to-peripheral ratio," Rcp. Jet production is found to be suppressed by approximately a factor of two in the 10% most central collisions relative to peripheral collisions. Rcp varies smoothly with centrality as characterized by the number of participating nucleons. The observed suppression is only weakly dependent on jet radius and transverse momentum. These results provide the first direct measurement of inclusive jet suppression in heavy ion collisions and complement previous measurements of dijet transverse energy imbalance at the LHC.Comment: 15 pages plus author list (30 pages total), 8 figures, 2 tables, submitted to Physics Letters B. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2011-02

Measurement of the View the tt production cross-section using eμ events with b-tagged jets in pp collisions at √s = 13 TeV with the ATLAS detector

This paper describes a measurement of the inclusive top quark pair production cross-section (σtt¯) with a data sample of 3.2 fb−1 of proton–proton collisions at a centre-of-mass energy of √s = 13 TeV, collected in 2015 by the ATLAS detector at the LHC. This measurement uses events with an opposite-charge electron–muon pair in the final state. Jets containing b-quarks are tagged using an algorithm based on track impact parameters and reconstructed secondary vertices. The numbers of events with exactly one and exactly two b-tagged jets are counted and used to determine simultaneously σtt¯ and the efficiency to reconstruct and b-tag a jet from a top quark decay, thereby minimising the associated systematic uncertainties. The cross-section is measured to be: σtt¯ = 818 ± 8 (stat) ± 27 (syst) ± 19 (lumi) ± 12 (beam) pb, where the four uncertainties arise from data statistics, experimental and theoretical systematic effects, the integrated luminosity and the LHC beam energy, giving a total relative uncertainty of 4.4%. The result is consistent with theoretical QCD calculations at next-to-next-to-leading order. A fiducial measurement corresponding to the experimental acceptance of the leptons is also presented

Search for strong gravity in multijet final states produced in pp collisions at √s=13 TeV using the ATLAS detector at the LHC

A search is conducted for new physics in multijet final states using 3.6 inverse femtobarns of data from proton-proton collisions at √s = 13TeV taken at the CERN Large Hadron Collider with the ATLAS detector. Events are selected containing at least three jets with scalar sum of jet transverse momenta (HT) greater than 1TeV. No excess is seen at large HT and limits are presented on new physics: models which produce final states containing at least three jets and having cross sections larger than 1.6 fb with HT > 5.8 TeV are excluded. Limits are also given in terms of new physics models of strong gravity that hypothesize additional space-time dimensions

Search for TeV-scale gravity signatures in high-mass final states with leptons and jets with the ATLAS detector at sqrt [ s ] = 13TeV

A search for physics beyond the Standard Model, in final states with at least one high transverse momentum charged lepton (electron or muon) and two additional high transverse momentum leptons or jets, is performed using 3.2 fb−1 of proton–proton collision data recorded by the ATLAS detector at the Large Hadron Collider in 2015 at √s = 13 TeV. The upper end of the distribution of the scalar sum of the transverse momenta of leptons and jets is sensitive to the production of high-mass objects. No excess of events beyond Standard Model predictions is observed. Exclusion limits are set for models of microscopic black holes with two to six extra dimensions

Operation and performance of the ATLAS semiconductor tracker

The semiconductor tracker is a silicon microstrip detector forming part of the inner tracking system of the ATLAS experiment at the LHC. The operation and performance of the semiconductor tracker during the first years of LHC running are described. More than 99% of the detector modules were operational during this period, with an average intrinsic hit efficiency of (99.74±0.04)%. The evolution of the noise occupancy is discussed, and measurements of the Lorentz angle, δ-ray production and energy loss presented. The alignment of the detector is found to be stable at the few-micron level over long periods of time. Radiation damage measurements, which include the evolution of detector leakage currents, are found to be consistent with predictions and are used in the verification of radiation background simulations

Measurement of the correlation between flow harmonics of different order in lead-lead collisions at √sNN = 2.76 TeV with the ATLAS detector

Correlations between the elliptic or triangular flow coefficients vm (m=2 or 3) and other flow harmonics vn (n=2 to 5) are measured using √sNN=2.76 TeV Pb+Pb collision data collected in 2010 by the ATLAS experiment at the LHC, corresponding to an integrated luminosity of 7 μb−1. The vm−vn correlations are measured in midrapidity as a function of centrality, and, for events within the same centrality interval, as a function of event ellipticity or triangularity defined in a forward rapidity region. For events within the same centrality interval, v3 is found to be anticorrelated with v2 and this anticorrelation is consistent with similar anticorrelations between the corresponding eccentricities, ε2 and ε3. However, it is observed that v4 increases strongly with v2, and v5 increases strongly with both v2 and v3. The trend and strength of the vm−vn correlations for n=4 and 5 are found to disagree with εm−εn correlations predicted by initial-geometry models. Instead, these correlations are found to be consistent with the combined effects of a linear contribution to vn and a nonlinear term that is a function of v22 or of v2v3, as predicted by hydrodynamic models. A simple two-component fit is used to separate these two contributions. The extracted linear and nonlinear contributions to v4 and v5 are found to be consistent with previously measured event-plane correlations

Search for H→γγ produced in association with top quarks and constraints on the Yukawa coupling between the top quark and the Higgs boson using data taken at 7 TeV and 8 TeV with the ATLAS detector

A search is performed for Higgs bosons produced in association with top quarks using the diphoton decay mode of the Higgs boson. Selection requirements are optimized separately for leptonic and fully hadronic final states from the top quark decays. The dataset used corresponds to an integrated luminosity of 4.5 fb−14.5 fb−1 of proton–proton collisions at a center-of-mass energy of 7 TeV and 20.3 fb−1 at 8 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. No significant excess over the background prediction is observed and upper limits are set on the tt¯H production cross section. The observed exclusion upper limit at 95% confidence level is 6.7 times the predicted Standard Model cross section value. In addition, limits are set on the strength of the Yukawa coupling between the top quark and the Higgs boson, taking into account the dependence of the tt¯H and tH cross sections as well as the H→γγ branching fraction on the Yukawa coupling. Lower and upper limits at 95% confidence level are set at −1.3 and +8.0 times the Yukawa coupling strength in the Standard Model