Table of Contents

GRAS Product Guide

Table of contents

  1. Introduction

  2. Reference Documents
    2.1 EPS programme documents
    2.2 SAF documents
    2.3 Papers, reports and other technical documentation

  3. GRAS Products Configuration History

  4. GRAS Products Overview
    4.1 The GRAS instrument
      4.1.1 Measurement principle
      4.1.2 GRAS hardware
      4.1.3 Data packet structure and basic instrument operation
    4.2 GRAS system concept
    4.3 GRAS data processing
      4.3.1 Level 0 to 1b data processing
      4.3.2 Level 1b product summary
      4.3.3 GRAS SAF Level 1b to 2 data processing

  5. Data Viewing and Reading

  6. GRAS Product Formats and Dissemination
    6.1 EPS products available dissemination means
      6.1.1 Satellite Direct Broadcast Service
      6.1.2 EUMETCast
      6.1.3 GTS/RMDCN
      6.1.4 UMARF
    6.2 GRAS products disseminatation
      6.2.1 Near-real-time dissemination
      6.2.2 Archive retrieval
    6.3 GRAS EPS product format
      6.3.1 The EPS native formats
        6.3.1.1 General overview of the EPS generic product format
        6.3.1.2 Granularity of the EPS products
        6.3.1.3 Product format version control
        6.3.1.4 Product naming convention
      6.3.2 GRAS Level 1a products
      6.3.3 GRAS Level 1b products
    6.4 The HDF format
    6.5 The WMO formats

  7. GRAS Products Processing Algorithms

  8. GRAS Products Validation and Monitoring
    8.1 Objectives
    8.2 GRAS in-orbit verification
    8.3 Instrument monitoring
    8.4 Validation
      8.4.1 Precise Orbit Determination validation
      8.4.2 Atmospheric profile validation
    8.5 Validation of GRAS SAF products
    8.6 Scientific activities carried out via the EPS/Metop RAO

  9. Record Description of the GRAS Level 1a Products

  10. Record Description of the GRAS Level 1b Products

Common Appendices

  Appendix A: Summary of all EPS Products

  Appendix B: Metop Operational Orbit
    B.1 Metop orbit basic parameters
    B.2 Metop attitude law
      B.2.1 Metop yaw steering law
    B.3 Metop orbit and attitude propagation
      B.3.1 Orbit propagation
      B.3.2 Metop attitude propagation

  Appendix C: Data Types Used by the Generic EPS Format
    C.1 Basic data types
    C.2 Compound data types

  Appendix D: Format and Contents of the GRH and IPR
    D.1 Generic Record Header
      D.1.1 RECORD_CLASS enumerated values
      D.1.2 INSTRUMENT_GROUP enumerated values
      D.1.3 RECORD_SUBCLASS values
      D.1.4 RECORD_SUBCLASS_VERSION values
      D.1.5 RECORD_SIZE values
      D.1.6 Definitions of RECORD_START_TIME and RECORD_STOP_TIME values
    D.2 Generic Internal Pointer Record

  Appendix E: Acronyms and Abbreviations