Time Table exchangeTime Table exchange

QSAS / CL / CAA / AMDAQSAS / CL / CAA / AMDA

CESR, 25/26 feb. 2008CESR, 25/26 feb. 2008

We all use time as an ordering quantity

Goals of this meeting

1/ Context

- Define time tables : TT- Show the scientific interest of TT exchange (see use case presentation)- See how time is handled in our different systems

2/ Actions

- Define a common TT format- Define an exchange protocole for communication between services / centres / tools- Define TT management tools : merge, intersect, extend, shift (SW)

3/ Perspectives

Think beyond time tables : catalogues of statistical parametres (mean, max, min)

Time TableTime Tablemanagement withmanagement with

AMDAAMDA

Automated Multi Dataset Analysis

cdpp-amda.cesr.fr

-What is AMDA ?- objectives- functionalities

-How does the information circulate inside AMDA ? - parameters- TT

-Communication between centres / services / tools- External data : CDAWeb, MAPSKP- CAA connexion demo

… for simple browse, building catalogues, performing statistics

Objectives

Ease manipulation of data from heterogeneous origins …

PlotCombineSearch

Download

MissionInstrumentResolution

LocalRemote

User owned

1/ Activity

2/ Data

3/ Time frame

Using AMDA

Select

The parameter level

A parameter is any time series :- magnetic or electric field vector- particles moments- indices- ...- combinations of the previous

valid on a given time range

at a given time resolution

used for :- plotting- searching- downloading, ...

17/11/199431/12/2005Sampling 4s

The file organisation inside the archive is hidden to the user

New parameter contruction 1/2

mouse clicks

define time resolution

define parameter name

supply description

Save new parameter in user workspace

The newly constructed parameter is now an element of the database. It is computed on the fly only when it is needed (virtual object concept).

Parameters from-different missions-different instruments-with different time resolution may be conbined

New parameter contruction 2/2

Tools are implemented : -‘time shifting’ to account for time lag between instruments,-‘resampling’ to account for resolution difference between instruments.

The Time Table level an easy way to communicate information between data centres/archives

- Time tables, or event lists, are a collection of times when ‘something’ happens or time spans when some conditions are true.

- They are usually manually created and managed by scientists for their own need or the one of restricted community.

- AMDA enhances the potentialities of these objects by offering a generic tool to create, handle and communicate them between databases/archives and users.

These time-tables may be used for :- extracting sub-databases,- executing massive and/or interactive treatments,- creating catalogues,- serving as reference in the community

Create a time table : 1- Conditional Search

Edit a condition with mathematical operators/functions

mouse clicksT/T// > 1

Define time spanor

use a time table

An example: search of the events when the cross-tail current is “encircled” by CLUSTER

Test:• X1< -10 Re • BX1 * BX2 * BX3 * BX4 > 0• min([BX1 BX2 BX3 BX4]) < 0• max([BX1 BX2 BX3 BX4]) > 0

Looking for the time periods when 2 s/c are above the neutral sheet and the 2 other ones are below

magneticfield

magneticfield

X coordinate

Create a time table : 2- Visual Inspection

Record intervals of interest by mouse clicks

The time table may be editedin the user workspace

Tables may be exported in

VOTable format

TT format

VOTable latest release: Version 1.1 - August 11, 2004

VO standard and as such supported by IVOA

VOTable is designed as a flexible storage and exchange format for tabular data, with particular emphasis on astronomical tables.

Complex tables (catalogues) may be produced :- with multiple time tags- associated parameters : average, max, min- geographic information- ...

Service 1

Service 2

Magnetospheric data

Service 3

Service 4

Solararchive

IonosphereThermosphere

archive

KParchive 2

KParchive 2

HRarchive 1

HRarchive 2

Time table- -- -- -

AMDA

What were the input conditions ?

What are the consequences ?

Time table circulation in a multi-archive environment

applying delay

Interface for building the external base data tree

External Bases User build data tree

CDAWebMAPSKPCDPP…

External data tree

Local base

External base user-extract

Parameters are available on the fly which implies :- data downloading (3 days at a time)- format transformation- building the AMDA parameter

LocalDatabase

AMDA

System

CDAWeb

CDPP

MAPSKP

Connexion à des bases externes

others

Connexion to CAA

Time Tables at CDAWeb

Conjunction Event Finder   for 1992-2010

http://darts.isas.jaxa.jp/stp/cef/cef.cgi

Architecture d’AMDA