Search Results for author: Alexander S. Szalay

Found 5 papers, 4 papers with code

Photo-z-SQL: integrated, flexible photometric redshift computation in a database

1 code implementation4 Nov 2016 Róbert Beck, László Dobos, Tamás Budavári, Alexander S. Szalay, István Csabai

Also, the efficient handling of variable filter sets is a necessity for heterogeneous databases, for example the Hubble Source Catalog, and for cross-match services such as SkyQuery.

Astrophysics of Galaxies Instrumentation and Methods for Astrophysics Databases

Efficient classification of billions of points into complex geographic regions using hierarchical triangular mesh

1 code implementation2 Oct 2014 Dániel Kondor, László Dobos, István Csabai, András Bodor, Gábor Vattay, Tamás Budavári, Alexander S. Szalay

We present a case study about the spatial indexing and regional classification of billions of geographic coordinates from geo-tagged social network data using Hierarchical Triangular Mesh (HTM) implemented for Microsoft SQL Server.

Databases

ORIGAMI: Delineating Halos using Phase-Space Folds

1 code implementation11 Jan 2012 Bridget L. Falck, Mark C. Neyrinck, Alexander S. Szalay

We present the ORIGAMI method of identifying structures, particularly halos, in cosmological N-body simulations.

Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies

Indexing the Sphere with the Hierarchical Triangular Mesh

1 code implementation26 Jan 2007 Alexander S. Szalay, Jim Gray, George Fekete, Peter Z. Kunszt, Peter Kukol, Ani Thakar

We describe a method to subdivide the surface of a sphere into spherical triangles of similar, but not identical, shapes and sizes.

Databases Data Structures and Algorithms

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