International Virtual Observatory Alliance
This note describes a simple and powerful method to specify sky regions. The goal is to have a way for providing very fast comparisons and data access methods. The principle is based on HEALPix sky tessellation. It boils down to defining a list of sky cells, grouped hierarchically. This method has been tested and validated in two tools: Aladin and Topcat, and in a front-end tool for VizieR catalogs.
MOC - HEALPix Multi-Order Coverage map
IVOA Note 12 April 2012
- Interest/Working Group:
- Thomas Boch, Tom Donaldson, Pierre Fernique, Wil O'Mullane, Martin Reinecke, Mark Taylor
- Pierre Fernique
This is an IVOA Note expressing suggestions from and opinions of the authors.
It is intended to share best practices, possible approaches, or other perspectives on interoperability with the Virtual Observatory. It should not be referenced or otherwise interpreted as a standard specification.