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MOC: Multi-Order Coverage map
Version 2.0

IVOA Recommendation 27 July 2022

Interest/Working Group:
http://www.ivoa.net/twiki/bin/view/IVOA/IvoaApplications
Author(s):
Pierre Fernique (CDS), Ada Nebot (CDS), Daniel Durand (CADC), Matthieu Baumann (CDS), Thomas Boch (CDS), Giuseppe Greco (EGO-Virgo), Tom Donaldson (STScI/NASA), Francois-Xavier Pineau (CDS), Mark Taylor (University of Bristol), Wil O'Mullane (Vera C. Rubin Observatory), Martin Reinecke (Max Planck), Sébastien Derrière (CDS)
Editor(s):
Pierre Fernique, Ada Nebot, Daniel Durand

Errata

1 accepted Erratum (last change: 2022-12-07)

Abstract

This document describes the Multi-Order Coverage map method (MOC) version 2.0 to specify arbitrary coverages for sky regions and/or time coverages and potentially other dimensions. The goal is to be able to provide a very fast comparison mechanism between coverages. The mechanism is based on a discretization of space and time dimensions. The system is based on the definition of a specific storage of the map coverage using predefined cells hierarchically grouped which makes it easy to produce and use for exploring astronomical collections. There are already a few applications and libraries which are taking advantage of this new standard.

Status of this document

This document has been produced by the Applications Interest Group.
It has been reviewed by IVOA Members and other interested parties, and has been endorsed by the IVOA Executive Committee as an IVOA Recommendation. It is a stable document and may be used as reference material or cited as a normative reference from another document. IVOA's role in making the Recommendation is to draw attention to the specification and to promote its widespread deployment. This enhances the functionality and interoperability inside the Astronomical Community.



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