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ECSS in the eXtreme
[article]
2007
arXiv
pre-print
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The right figure appears later in the same paper. last ADASS (O'Mullane et al. 2007 ). ...
The author conducted a survey over one year of many large science developments O'Mullane 2005. ...
arXiv:0712.0249v1
fatcat:qb2p3csey5dmrfbowpytzbzroq
It Challenges Of Gaia'S Astrometric Global Iterative Solution
2015
Zenodo
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IT | William O'Mullane | 25/11/2015 | 13/20European Space Agency
Gaia AGIS IT | William O'Mullane | 25/11/2015 | 15/20European Space Agency
Gaia AGIS IT | William O'Mullane | 25/11/2015 | 17/ ...
O'Mullane | 25/11/2015 | 5/20European Space Agency
t obs n t obs 1 Gaia AGIS IT | William O'Mullane | 25/11/2015 | 6/20 European Space Agency
Gaia AGIS IT | William O'Mullane | 25/11/2015 | ...
doi:10.5281/zenodo.34577
fatcat:7klykuijdbc5zhfqcapitj2qu4
When Database Systems Meet the Grid
[article]
2005
arXiv
pre-print
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(http://casjobs.sdss.org/casjobs), substitute MySkyServerDr1.dbo for your target database (e.g: dr1, dr2, or dr3) If you have MyDB or Interface problems please contact Nolan Li <nli@pha.jhu.edu>, Wil O'Mullane ...
arXiv:cs/0502018v1
fatcat:52xi4nfh3rf2ri33ubutnnosey
COTS software in science operations, is it worth it?
[article]
2016
arXiv
pre-print
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O'Mullane, Bach
GTS Cost For Aspera we have a mix of licenses and development: • Aspera licenses and support to date e158K • DTSTool, customisation, automation etc. .. effort ≈ 3.5 person years incl. ...
arXiv:1701.06484v1
fatcat:jv52rkb6d5c7vl5t7fygys4nlq
The Past, Present and Future of Astronomical Data Formats
[article]
2014
arXiv
pre-print
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Thanks to Will O'Mullane for keeping us all on time so that everyone who wanted to got to contribute and to Bob Mann for taking very good notes on the discussion. ...
arXiv:1411.0996v1
fatcat:zgc2p2p6gne3bb6r5uhhi7ipwm
Astronomy and Computing: a New Journal for the Astronomical Computing Community
[article]
2012
arXiv
pre-print
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O'Mullane), andreas.wicenec@uwa.edu.au (Andreas Wicenec), wise@astron.nl (Michael Wise) The range of topics to appear will be mirrored by the range of people writing and reading the papers. ...
Alberto Accomazzi), tamas.budavari@jhu.edu (Tamás Budavári), cfluke@astro.swin.edu.au (Christopher Fluke), norman@astro.gla.ac.uk (Norman Gray), rgm@roe.ac.uk (Robert G Mann), womullan@sciops.esa.int (William ...
arXiv:1210.8030v1
fatcat:p4zjm2sqwbbl5h6gbsinqipw4i
A Need for Dedicated Outreach Expertise and Online Programming: Astro2020 Science White Paper
[article]
2019
arXiv
pre-print
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Maximizing the public impact of astronomy projects in the next decade requires NSF-funded centers to support the development of online, mobile-friendly outreach and education activities. EPO teams with astronomy, education, and web development expertise should be in place to build accessible programs at scale and support astronomers doing outreach.
arXiv:1910.14088v1
fatcat:mueillch25cobiwrpef7dnnavi
Optimising the Gaia scanning law for relativity experiments
2009
Proceedings of the International Astronomical Union
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AbstractGaia is ESA's upcoming astrometry mission, building on the heritage of its predecessor, Hipparcos. The Gaia nominal scanning law (NSL) prescribes the ideal attitude of the spacecraft over the operational phase of the mission. As such, it precisely determines when certain areas of the sky are observed. From theoretical considerations on sky-sampling uniformity, it is easy to show that the optimum scanning law for a space astrometry experiment like Gaia is a revolving scan with uniform
doi:10.1017/s1743921309990597
fatcat:ht4cm563lnagljnf2m3wvrhv4y
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... ation around the instrument symmetry axis. Since thermal stability requirements for Gaia's payload require the solar aspect angle to be fixed, the optimum parallax resolving power is obtained by letting the spin axis precess around the solar direction. The precession speed has been selected as compromise, limiting the across-scan smearing of images when they transit the focal plane, providing sufficient overlap between successive "great-circle" scans of the fields of view, and guaranteeing overlap of successive precession loops. With this scanning law, with fixed solar-aspect angle, spin rate, and precession speed, only two free parameters remain: the initial spin phase and the initial precession angle, at the start of science operations. Both angles, and in particular the initial precession angle, can be initialized following various (programmatic) criteria. Examples are optimization/fine-tuning of the Earth-pointing angle, of the number and total duration of Galactic-plane scans, or of the ground-station scheduling. This paper explores various criteria, with particular emphasis on the opportunity to optimise the scanning-law initial conditions to "observe" the most favorable passages of bright stars very close to Jupiter's limb. This would allow a unique determination of the light deflection due to the quadrupole component of the gravitational field of this planet.
GAVIP: A Platform for Gaia Data Analysis
[article]
2016
arXiv
pre-print
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2016
Software and Cyberinfrastructure for Astronomy IV
unpublished
doi:10.1117/12.2233619 fatcat:zmniyafpwfa2li6ot7il5quuue
doi:10.1117/12.2233619 fatcat:zmniyafpwfa2li6ot7il5quuue
Gaia is a major European Space Agency (ESA) astrophysics mission designed to map and analyse 10^9 stars, ultimately generating more than 1 PetaByte of data products. As Gaia data becomes publicly available and reaches a wider audience, there is an increasing need to facilitate the further use of Gaia products without needing to download large datasets. The Gaia Added Value Interface Platform (GAVIP) is designed to address this challenge by providing an innovative platform within which
arXiv:1605.09287v1
fatcat:qhwqooav4rcw5apdjrarj3juji
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... can submit and deploy code, packaged as "Added Value Interfaces" (AVIs), which will be executed close to the data. Deployed AVIs and associated outputs may also be made available to other GAVIP platform users, thus providing a mechanism for scientific experiment reproducibility. This paper describes the capabilities and features of GAVIP.
There Goes the Neighborhood: Relational Algebra for Spatial Data Search
[article]
2004
arXiv
pre-print
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We explored ways of doing spatial search within a relational database: (1) hierarchical triangular mesh (a tessellation of the sphere), (2) a zoned bucketing system, and (3) representing areas as disjunctive-normal form constraints. Each of these approaches has merits. They all allow efficient point-in-region queries. A relational representation for regions allows Boolean operations among them and allows quick tests for point-in-region, regions-containing-point, and region-overlap. The speed of
arXiv:cs/0408031v1
fatcat:dwodaxl6u5dxjprafds4t2kygq
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... these algorithms is much improved by a zone and multi-scale zone-pyramid scheme. The approach has the virtue that the zone mechanism works well on B-Trees native to all SQL systems and integrates naturally with current query optimizers - rather than requiring a new spatial access method and concomitant query optimizer extensions. Over the last 5 years, we have used these techniques extensively in our work on SkyServer.sdss.org, and SkyQuery.net.
Extending the SDSS Batch Query System to the National Virtual Observatory Grid
[article]
2004
arXiv
pre-print
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The Sloan Digital Sky Survey science database is approaching 2TB. While the vast majority of queries normally execute in seconds or minutes, this interactive execution time can be disproportionately increased by a small fraction of queries that take hours or days to run; either because they require non-index scans of the largest tables or because they request very large result sets. In response to this, we added a multi-queue job submission and tracking system. The transfer of very large result
arXiv:cs/0403017v1
fatcat:cfv4x7opufacdcqypvjlprjdwm
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... sets from queries over the network is another serious problem. Statistics suggested that much of this data transfer is unnecessary; users would prefer to store results locally in order to allow further cross matching and filtering. To allow local analysis, we implemented a system that gives users their own personal database (MyDB) at the portal site. Users may transfer data to their MyDB, and then perform further analysis before extracting it to their own machine. We intend to extend the MyDB and asynchronous query ideas to multiple NVO nodes. This implies development, in a distributed manner, of several features, which have been demonstrated for a single node in the SDSS Batch Query System (CasJobs). The generalization of asynchronous queries necessitates some form of MyDB storage as well as workflow tracking services on each node and coordination strategies among nodes.
The demise of the filesystem and multi level service architecture
[article]
2019
arXiv
pre-print
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Many astronomy data centres still work on filesystems. Industry has moved on; current practice in computing infrastructure is to achieve Big Data scalability using object stores rather than POSIX file systems. This presents us with opportunities for portability and reuse of software underlying processing and archive systems but it also causes problems for legacy implementations in current data centers.
arXiv:1907.13060v2
fatcat:44idxf3i7jc6bl2vdrawppm2ry
Astronomy and Computing: A new journal for the astronomical computing community
2013
Astronomy and Computing
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O'Mullane), andreas.wicenec@uwa.edu.au (A. Wicenec), wise@astron.nl (M. ...
doi:10.1016/j.ascom.2012.10.001
fatcat:yxx7tz747zdgdmvr7l264ymmly
IVOA Recommendation: IVOA Astronomical Data Query Language Version 2.00
[article]
2011
arXiv
pre-print
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This document describes the Astronomical Data Query Language (ADQL). ADQL has been developed based on SQL92. This document describes the subset of the SQL grammar supported by ADQL. Special restrictions and extensions to SQL92 have been defined in order to support generic and astronomy specific operations.
arXiv:1110.0503v1
fatcat:dzvuz63pfvddrlgovlrnmjrrbe
Implementing the Gaia Astrometric Global Iterative Solution (AGIS) in Java
2011
Experimental astronomy (Print)
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This paper provides a description of the Java software framework which has been constructed to run the Astrometric Global Iterative Solution for the Gaia mission. This is the mathematical framework to provide the rigid reference frame for Gaia observations from the Gaia data itself. This process makes Gaia a self calibrated, and input catalogue independent, mission. The framework is highly distributed typically running on a cluster of machines with a database back end. All code is written in
doi:10.1007/s10686-011-9248-z
fatcat:qsozpaiyezb27a36npu7ikb4ny
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... Java language. We describe the overall architecture and some of the details of the implementation.
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