Implementing SIAv2 Over Rubin Observatory's Data Butler

TL;DR

This paper discusses the implementation of SIAv2 protocol directly over Rubin Observatory's Data Butler to improve data access, addressing deployment constraints and metadata compatibility issues.

Contribution

It presents a novel approach to integrate SIAv2 with the Data Butler, bypassing previous deployment constraints and analyzing metadata mismatches.

Findings

Successful implementation of SIAv2 over Data Butler

Identification of metadata mismatches

Deployment status and future plans

Abstract

The IVOA Simple Image Access version 2 protocol defines an easy way to provide community access to a collection of data. At the Vera C. Rubin Observatory we currently enable ObsTAP access to our data holdings via an ObsCore export or view of our Data Butler repositories. This approach comes with some deployment constraints, such as requiring pgsphere and compatibility with our CADC TAP implementation, so recently we decided to see whether we could instead provide an SIAv2 service that talks directly to our Data Butler. Here we describe our motivation, implementation strategies, and current deployment status, as well as discussing some metadata mismatches between the Butler data models and SIAv2.