423 citations · 586 across the 5 of their papers we have counts for
5 papers
Searchable Sky Coverage of Astronomical Observations: Footprints and Exposures
Tamas Budavari, Alex Szalay, Gyorgy Fekete
Sky coverage is one of the most important pieces of information about astronomical observations. We discuss possible representations, and present algorithms to create and manipulat…
Indexing the Sphere with the Hierarchical Triangular Mesh
Alexander S. Szalay, Jim Gray, George Fekete +3
We describe a method to subdivide the surface of a sphere into spherical triangles of similar, but not identical, shapes and sizes. The Hierarchical Triangular Mesh (HTM) is a quad…
Using Table Valued Functions in SQL Server 2005 To Implement a Spatial Data Library
Jim Gray, Alex Szalay, Gyorgy Fekete
This article explains how to add spatial search functions (point-near-point and point in polygon) to Microsoft SQL Server 2005 using C# and table-valued functions. It is possible t…
There Goes the Neighborhood: Relational Algebra for Spatial Data Search
Jim Gray, Alexander S. Szalay, Aniruddha R. Thakar +5
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) repres…
Preparing Red-Green-Blue (RGB) Images from CCD Data
Robert Lupton, Michael R. Blanton, George Fekete +4
We present a new, and we believe arguably correct, algorithm for producing Red-Green-Blue (RBG) composites from 3-band astronomical images. Our method ensures that an object with a…