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BEST : a workbench to simplify data user life

ContextTools vs. Data life cycleSuccess storyNear futureDemonstrationConclusion. . Table of contents. Context. Context. Relies on two recommendation : EAST and DEDSLEAST technology : initiated by the CNES in 1989-1990.EAST (Enhanced Ada subset)The data description language EAST specification

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BEST : a workbench to simplify data user life

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    1. BEST : a workbench to simplify data user life

    2. Context Tools vs. Data life cycle Success story Near future Demonstration Conclusion Table of contents

    3. Context

    4. Context Relies on two recommendation : EAST and DEDSL EAST technology : initiated by the CNES in 1989-1990. EAST (Enhanced Ada subset) The data description language EAST specification EAST designed in the framework of CCSDS Panel II (CCSDS 644.0-B-2 Nov 2002) ISO standard ISO 15889:2003 Used to describe data structure on its medium DEDSL Data Entity Dictionary Specification Language DEDSL (Data Entity Dictionary Specification language) designed in the framework of CCSDS Panel II (CCSDS 647.3-B-1 Jan 2002) Based on PVL or XML/DTD Syntax Used to describe data semantics Each data field or type is described through attributes (standard ones or user purpose ones)

    5. Data life cycle

    6. BEST tools presentation

    7. BEST (Beyond EAST) BEST framework offers a simple and intuitive access to the suite of tools through a user friendly GUI . Highly customised by each user according to his specific needs and preferences : Easy way to add plug-ins sharing models and data. The Project Management support provides a virtual organisation of the file system allowing to gather in one bundle all the files related to a given project/mission (data models, data files, documentation, etc.).

    8. Modelling

    9. OASIS Modeller Modeling data through a performing graphical user interface. Definition of the logical model i.e. the data structure, the data type, the range of possible values, etc. Definition of the physical model i.e. encoding format of the data on the medium. Definition of the semantic information related to a data format. Based on XML internal format (XML-IF). OASIS Modeller provides the following features : Specifying real and integer formats for ascii data, Associating default values to a given element of the data model, Defining elements discriminated or elements size by a computed value (calculation capabilities), Checking that the syntactic information is correctly and exhaustively filled in the data model, Searching elements in description according to any criteria : syntactic, semantic, Viewing facilities of ASCII files generated by the tool, Library concept : allows the reuse and the sharing of predefined types,

    10. OASIS Modeller : inputs/outputs

    11. Generating & Simulating

    12. DPE (Data Producer & Editor) The Data Producer & Editor (DPE) is a graphical tool that provides editing, generating, checking features for data described by an EAST description The DPE provides several functions: Data model handling: tree structure of the data model, Data product consultation: tree view and navigation, Data product generation: advanced generation of data products, Data product edition: edit the content of a data product, Data checking: check if a data product is compliant with its EAST model, Search capabilities: searching elements in a data product.

    13. DPE (Data Producer & Editor)

    14. Processing

    15. DEQ (Data Extractor & Querying) The DEQ tool provides editing, extracting features throught friendly GUI. The Data Extractor & Querying tool provides the following functions : Description file handling reads and interprets any XML-IF file and display it in a tree-like graphical view, Data products handling provides the ability to read and display data products from several sources. The tool also provides the ability to navigate through the whole data product, XML views: Allows to create XML views of the data products, Queries provide the ability to create and process queries upon a data products, search through one or more products at the same time, Data extraction allows to extract elements from data products, Batch processing enables users to schedule data querying and data extraction at a later time.

    16. DEQ (Data Extractor & Querying)

    17. Utilities Comparison Tool : Compares two versions of a Model (XML-IF) and displays the difference in a tree-view or XML file Data Checker : Checks a Data (binary or ascii) against an EAST Model. ASCII Dump : Generates an ASCII representation of Data: Text or XML structure.

    18. Post Processing

    19. PPT (Post Processing Tools) XML Tagging Generates a customized XML file from extracted data Quick Look Smart presentation of extracted Data Visu2d Draws some graphs from Data

    20. Distribution

    21. Packager and Web The Packager component is intended to provide means to enable the dissemination of data products together with their documentation and descriptions. Provided feature : Packaging capabilities Compression capabilities The Web API provides remote access to a subset of the BEST software functions whatever the target platform and without any specific installation of DEBAT. Some of the features are described below : User Authentication Descriptions/Data product upload, readingand checking Data product generation Data search Extraction XML transformation

    22. Existing BEST plugins 2 additional plug-ins based on XML ALADIN : XML description comparisons (XML-DEDSL and XML Schema) SCRIBE : XML post processor transforming XML data descriptions into ICDs (Word or HTML) Both are in test in PLEIADES context to produce and compare ICD versions SCRIBE is already operational on Helios project

    23. Success story

    24. Success story The list of project using EAST and DEDSL is now quite long... Historical projects: SPOT (Earth observation), SSALTO (altimetry), CDPP (data centre for plasma physics), PHARAO (embedded atomic clock), Helios II Current projects: Octave (CNES), Stilo (CNES), ATV (CNES), Atmospheric Balloons (CNES) Projects evaluating BEST: Goce (ESA), Aeolus (ESA), Envisat/Cryosat (ESA), Pleiades (CNES)

    25. Near future

    26. Near future BEST team invests a lot on the XML technologies. The modeller could help in designing data and producing the documentation. Tools for XTCE norm: studies will be lead on OASIS Modeller for modelling description following XTCE norm. Studies still in progress both in CNES and ESA for the ground segment standardisation based on XML schema.

    27. Demonstration

    28. Conclusion

    29. Conclusion BEST is a generic tool covering the entire data life cycle BEST software is available on: Windows, Linux and Unix platforms BEST is developed using free technologies and as far as possible open source BEST is available freely for users under the form of a binary distribution Contacts: For any BEST/EAST/DEDSL question there is a hot-line at : support.east@cnes.fr To get BEST version 1.2.1 and related information : http://debat.c-s.fr To get the previous versions : logiciels.cnes.fr

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