A5062688204- Radio Astronomy Observations and Technology
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- 3D Surveying and Cultural Heritage
- Data Management and Algorithms
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Image Processing and 3D Reconstruction
- Remote Sensing and LiDAR Applications
- 3D Modeling in Geospatial Applications
- Galaxies: Formation, Evolution, Phenomena
- 3D Shape Modeling and Analysis
- Scientific Research and Discoveries
- Antenna Design and Optimization
- Superconducting and THz Device Technology
- Astronomical Observations and Instrumentation
- Archaeological Research and Protection
- Advanced Data Storage Technologies
- Cloud Computing and Resource Management
- Advanced Database Systems and Queries
- Pulsars and Gravitational Waves Research
- Soil Moisture and Remote Sensing
- Geochemistry and Geologic Mapping
- Computer Graphics and Visualization Techniques
Universitat de Barcelona
2016-2017
Astronomical Institute of the Slovak Academy of Sciences
2013-2017
Netherlands eScience Center
2015-2017
University of Groningen
2012-2015
Japan External Trade Organization
2015
This study aims to characterise the polarized foreground emission in ELAIS-N1 field and address its possible implications for extraction of cosmological 21-cm signal from Low-Frequency Array - Epoch Reionization (LOFAR-EoR) data. We use high band antennas LOFAR image this region RM-synthesis unravel structures at Galactic latitudes. The brightness temperature detected is on average 4 K intensity covers range -10 +13rad m^-2 Faraday depth. total polarization angle show a wide morphological...
Detection of the 21-cm signal coming from epoch reionization (EoR) is challenging especially because, even after removing foregrounds, residual Stokes I maps contain leakage polarized emission that can mimic signal. Here, we discuss instrumental polarization Low Frequency Array (LOFAR) and present realistic simulations leakages between parameters. From LOFAR observations in 3C196 field, have quantified level caused by nominal model beam LOFAR, compared it with EoR using power spectrum...
The first generation of redshifted 21 cm detection experiments, carried out with arrays like LOFAR, MWA and GMRT, will have a very low signal-to-noise ratio per resolution element (\sim 0.2). In addition, whereas the variance cosmological signal decreases on scales larger than typical size ionization bubbles, formidable galactic foregrounds increases, making it hard to disentangle two such large scales. poor sensitivity small one hand, effect other make direct imaging Epoch Reionization...
Powered by WebGL, some renderers have recently become available for the visualization of point cloud data over web, example Plasio or Potree. We extended Potree to be able visualize massive clouds and we successfully used it with second national Lidar survey Netherlands, AHN2, 640 billion points. In addition visualization, publicly service at ttp://ahn2.pointclouds.nl/ also features a multi-resolution download tool, geographic name search bar, measurement toolkit, 2D orientation map field...
Fast radio bursts are a new class of transient phenomena currently detected as millisecond pulses with very high dispersion measures. As surveys begin searching for FRBs large population is expected to be in real-time, triggering range multi-wavelength and multi-messenger telescopes search repeating and/or associated emission. Here we propose method disseminating FRB triggers using Virtual Observatory Events (VOEvents). This format was developed used successfully alerts across the...
We present radio observations of the Moon between $35$ and $80$ MHz to demonstrate a novel technique interferometrically measuring large-scale diffuse emission extending far beyond primary beam (global signal) for first time. In particular, we show that (i) appears as negative-flux source at frequencies $35<\nu<80$ since it is `colder' than Galactic background occults, (ii) using (negative) flux lunar disc, can reconstruct spectrum with thermal reference, (iii) reflected RFI (radio-frequency...
The popularity, availability and sizes of point cloud data sets are increasing, thus raising interesting management processing challenges. Various software solutions available for the data. A benchmark systems was defined it executed several solutions. In this paper we focus on based column-store MonetDB, generic out-of-the-box approach is compared with two alternative approaches that exploit spatial coherence to improve access minimize storage requirements.
This article discusses the use of 3D technologies in digital earth applications (DEAs) to study complex sites. These are large areas containing objects with heterogeneous shapes and semantic information. The proposes that DEAs should be modular, have multi-tier architectures, developed as Free Open Source Software if possible. In requiring high reliability measurements, point clouds proposed basis for Digital representation. For development DEAs, we propose follow a workflow four components:...
In the last decade Photogrammetry has shown to be a valid alternative LiDAR techniques for generation of dense point clouds in many applications. However, dealing with large image sets is computationally demanding. It requires high performance hardware and often long processing times that makes photogrammetric cloud not suitable mapping purposes at regional national scale. These limitations are partially overcome by commercial solutions, thanks use expensive dedicated hardware. Nonetheless,...
Earth observation sciences produce large sets of data which are inherently rich in spatial and geo-spatial information. Together with live collected from monitoring systems collections semantically objects they provide new opportunities for advanced eScience research on climatology, urban planing smart cities. Such combination heterogeneous forms a source knowledge. Efficient knowledge extraction them is an challenge. It requires efficient bulk injection both static streaming sources,...
One of the key science projects Low-Frequency Array (LOFAR) is detection cosmological signal coming from Epoch Reionization (EoR). Here we present LOFAR EoR Diagnostic Database (LEDDB) that used in storage, management, processing and analysis observations. It stores referencing information observations diagnostic parameters extracted their calibration. This stored data to ease pipeline processing, monitor performance telescope visualize which facilitates several contamination effects on...