60 resultados para Astronomical photography


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This paper describes the development and applications of a super-resolution method, known as Super-Resolution Variable-Pixel Linear Reconstruction. The algorithm works combining different lower resolution images in order to obtain, as a result, a higher resolution image. We show that it can make significant spatial resolution improvements to satellite images of the Earth¿s surface allowing recognition of objects with size approaching the limiting spatial resolution of the lower resolution images. The algorithm is based on the Variable-Pixel Linear Reconstruction algorithm developed by Fruchter and Hook, a well-known method in astronomy but never used for Earth remote sensing purposes. The algorithm preserves photometry, can weight input images according to the statistical significance of each pixel, and removes the effect of geometric distortion on both image shape and photometry. In this paper, we describe its development for remote sensing purposes, show the usefulness of the algorithm working with images as different to the astronomical images as the remote sensing ones, and show applications to: 1) a set of simulated multispectral images obtained from a real Quickbird image; and 2) a set of multispectral real Landsat Enhanced Thematic Mapper Plus (ETM+) images. These examples show that the algorithm provides a substantial improvement in limiting spatial resolution for both simulated and real data sets without significantly altering the multispectral content of the input low-resolution images, without amplifying the noise, and with very few artifacts.

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Presentació dels estudis de fotografia de la facultat de Belles Arts i d'una selecció de treballs de l'alumnat de Processos de la Creació Artística, en una publicació de difusió.

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Informe que resumeix i aporta dades i evidències de l'experiència pilot d'aplicació dels PNT específics elaborats, portada a terme al Laboratori de Fotografia de la Facultat de Belles Arts, UB.

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Informe sobre l'experiència pilot duta a terme al laboratori de Fotografia de la Facultat de Belles Arts, en el marc del projecte d'innovació docent LA GESTIÓ INTEGRADA DE LA QUALITAT, EL MEDI AMBIENT I LA SEGURETAT A LA DOCÈNCIA EXPERIMENTAL DELS ESTUDIS DE GRAU DE LES FACULTATS DE BELLES ARTS

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En el marc del procés de desenvolupament de l'Espai Europeu d¿Educació Superior, aquest article presenta una activitat d'aprenentatge innovadora, amb la que es pretén fomentar diverses competències afins a les directrius proposades, com són l'autoaprenentatge, el treball col·laboratiu, la cerca i anàlisi de documentació, l'autoavaluació i l'avaluació entre iguals, que es duu a terme en l'assignatura teòrica i pràctica Fotografia, optativa del grau de l'ensenyament de Belles Arts....

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Informe sobre l'evolució de les mesures de seguretat i sostenibilitat adoptades al Laboratori de fotografia de la Facultat de Belles Arts des de la seva creació i de la incidència i beneficis que el projecte d'innnovació docent ha suposat. La gestió integrada de la qualitat, el medi ambient i la seguretat en la docència experimental dels estudis de grau de les Facultats de Belles Arts A: VALLE MARTÍ, J. (coord.) et al. Els procediments normalitzats de treball en la gestió integrada de la qualitat, el medi ambient i la seguretat en la docència experimental de les facultats de belles arts. Vídeos i documents. Barcelona: Publicacions i Edicions de la UB, 2010. Format llibre i DVD. ISBN: 978-84-475-3477-7.

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Informe sobre l'evolució de la incidència i dels beneficis que ha suposat per a l'alumnat l'aprenentatge dels continguts en seguretat i sostenibilitat específics de la matèria de l'ensenyament, com a conseqüència de l'experiència pilot duta a terme dins del marc del projecte d'innnovació docent La gestió integrada de la qualitat, el medi ambient i la seguretat en la docència experimental dels estudis de grau de les Facultats de Belles Arts.

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Las grandes fotografías Espacespages [Espaciospáginas] (2009) trabajan en la transformacióndel espacio creativo de la página blanca hacia el espacio habilitado y de obertura al mundo.La imagen da protagonismo al vacío de la habitación, casi una celda, donde tiene lugar unaacción, iluminada tenuemente a través de una ventana doble que me hace pensar en dos ojosque contemplan atentos el interior de un proceso de creación...

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Las grandes fotografías Espacespages [Espaciospáginas] (2009) trabajan en la transformacióndel espacio creativo de la página blanca hacia el espacio habilitado y de obertura al mundo.La imagen da protagonismo al vacío de la habitación, casi una celda, donde tiene lugar unaacción, iluminada tenuemente a través de una ventana doble que me hace pensar en dos ojosque contemplan atentos el interior de un proceso de creación...

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Les grans fotografies Espacespages [Espaispàgines] (2009) treballen en la transformació del’espai creatiu de la pàgina blanca vers l’espai habitat i d’obertura al món. La imatge dóna protagonisme a la cambra buida, quasi una cel·la on esdevé l’acció, il·luminada tènuement a través d’una finestra doble, com dos ulls que contemplen el dedins d’un procés interior de creació.

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White under Black. Works from the imperceptible / 1. Blanca Casas Brullet: Make Say The large photographs of Espacespages (2009) work to transform the creative space of the blank page toward the enabled space of openness to the world. The image gives prominence to the emptiness of the room, almost a cell, in which an action takes place, dimly illuminated by a pair of windows that makes me think of two eyes that attentively contemplate the interior of a process of creation.

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És un estudi sobre el funcionament de la terminologia, en les llengües catalanes i anglesa, sobre un camp semàntic concret que no ofereix gaires equivalents cap a la llengua anglesa: la gastronomia, més en concret, les postres catalanes. Havent-hi aquest buit terminològic, també hi consta una sèrie de propostes neològiques

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In 2009, Cygnus X-3 (Cyg X-3) became the first microquasar to be detected in the GeV γ-ray regime, via the satellites Fermi and AGILE. The addition of this new band to the observational toolbox holds promise for building a more detailed understanding of the relativistic jets of this and other systems. We present a rich data set of radio, hard and soft X-ray, and γ-ray observations of Cyg X-3 made during a flaring episode in 2010 May. We detect a ~3 day softening and recovery of the X-ray emission, followed almost immediately by a ~1 Jy radio flare at 15 GHz, followed by a 4.3σ γ-ray flare (E > 100 MeV) ~1.5 days later. The radio sampling is sparse, but we use archival data to argue that it is unlikely the γ-ray flare was followed by any significant unobserved radio flares. In this case, the sequencing of the observed events is difficult to explain in a model in which the γ-ray emission is due to inverse Compton scattering of the companion star's radiation field. Our observations suggest that other mechanisms may also be responsible for γ-ray emission from Cyg X-3.

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The European Space Agency's Gaia mission will create the largest and most precise three dimensional chart of our galaxy (the Milky Way), by providing unprecedented position, parallax, proper motion, and radial velocity measurements for about one billion stars. The resulting catalogue will be made available to the scientific community and will be analyzed in many different ways, including the production of a variety of statistics. The latter will often entail the generation of multidimensional histograms and hypercubes as part of the precomputed statistics for each data release, or for scientific analysis involving either the final data products or the raw data coming from the satellite instruments. In this paper we present and analyze a generic framework that allows the hypercube generation to be easily done within a MapReduce infrastructure, providing all the advantages of the new Big Data analysis paradigmbut without dealing with any specific interface to the lower level distributed system implementation (Hadoop). Furthermore, we show how executing the framework for different data storage model configurations (i.e. row or column oriented) and compression techniques can considerably improve the response time of this type of workload for the currently available simulated data of the mission. In addition, we put forward the advantages and shortcomings of the deployment of the framework on a public cloud provider, benchmark against other popular solutions available (that are not always the best for such ad-hoc applications), and describe some user experiences with the framework, which was employed for a number of dedicated astronomical data analysis techniques workshops.

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The European Space Agency's Gaia mission will create the largest and most precise three dimensional chart of our galaxy (the Milky Way), by providing unprecedented position, parallax, proper motion, and radial velocity measurements for about one billion stars. The resulting catalogue will be made available to the scientific community and will be analyzed in many different ways, including the production of a variety of statistics. The latter will often entail the generation of multidimensional histograms and hypercubes as part of the precomputed statistics for each data release, or for scientific analysis involving either the final data products or the raw data coming from the satellite instruments. In this paper we present and analyze a generic framework that allows the hypercube generation to be easily done within a MapReduce infrastructure, providing all the advantages of the new Big Data analysis paradigmbut without dealing with any specific interface to the lower level distributed system implementation (Hadoop). Furthermore, we show how executing the framework for different data storage model configurations (i.e. row or column oriented) and compression techniques can considerably improve the response time of this type of workload for the currently available simulated data of the mission. In addition, we put forward the advantages and shortcomings of the deployment of the framework on a public cloud provider, benchmark against other popular solutions available (that are not always the best for such ad-hoc applications), and describe some user experiences with the framework, which was employed for a number of dedicated astronomical data analysis techniques workshops.