Introduction to the workshop 2007 04 1213 SNAP

Introduction to the workshop 2007 -04 -12/13 SNAP data model

Welcome • agenda • Background – Cambridge workshop, April 2006 • Propose SNAP (used to be SPAP, should maybe be SSSAP) – Victoria interop meeting, May 2006 • Agreed to go ahead with SNAP • SNAP should be mirrored on SSAP, not SIAP, i. e. based on a data model for the meta-data 2007 -04 -12/13 SNAP data model

From Victoria 2006, closing plenary What is SNAP ? • Subject: – N-body – (adaptive) mesh – “evolving objects in 3 D space” • Functions: – Retrieve whole – Retrieve part: Question, how to decide which part ? – Proposal: need functions creating small, summarising, meaningful info about the dataset. Examples: thumbnail, random sample, projection, gridding (for particles). (see CGs presentation) • Query: based on metadata model • Protocol: not discussed here, but initial draft exists. ADQL ? 2007 -04 -12/13 SNAP data model

Preliminary discussion items 2007 -04 -12/13 SNAP data model

Name of the protocol • SNAP is confusing – “Numerical” suggests more than we aim to support – SNAP acronym is already in use for Supernova/Acceleration Probe http: //snap. lbl. gov/ • How about: Simple Spatial Simulations Access Protocol (SSSAP) 2007 -04 -12/13 SNAP data model

Type of simulations in SNAP TBD do we still need this comparison? • We have had some discussions concerning which type of simulations we want SNAP to support and about the kind of services that should be supported. • GL: the case for spatial simulations – – – Common subject: part of space-time Results relatively standard Some large software packages used by many people Theory spectra supported by SSA (is claim) We need to start somewhere • HW: the case for more generic simulations (is this what HW wanted to discuss, or more the services? ) 2007 -04 -12/13 SNAP data model

Type of services in SNAP (can only really discuss this later in this workshop) • Spatial cutout services only – Produces data products of same type as published data products • A few more “SNAP-standard” services (building blocks): – – Projections Light-cones Transformation of observables … • Also allow cutouts (etc? ) on the dependent variables (observables) • Allow also generic, notn-prescribed services (like the ones that can be registered already) 2007 -04 -12/13 SNAP data model