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Global Systems Division (GSD) Earth System Research Laboratory (ESRL)

Binary Universal Form Representation (BUFR) Paul Hamer November, 2009. Global Systems Division (GSD) Earth System Research Laboratory (ESRL). WMO Table Driven Code Forms. Why BUFR is important? WMO 14th Congress in 2003 supported the adoption of TDCF’s. TDCF’s include BUFR/CREX and GRIB.

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Global Systems Division (GSD) Earth System Research Laboratory (ESRL)

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  1. Binary Universal Form Representation (BUFR) Paul Hamer November, 2009 Global Systems Division (GSD) Earth System Research Laboratory (ESRL)

  2. WMO Table Driven Code Forms • Why BUFR is important? • WMO 14th Congress in 2003 supported the adoption of TDCF’s. • TDCF’s include BUFR/CREX and GRIB. • Migration to BUFR to be complete by 2015. (CREX –Character form for Representation and EXchange.) Global Systems Division (GSD) Earth System Research Laboratory (ESRL)

  3. WMO BUFR • Documentation and standard code tables from WMO (http://www.wmo.ch/pages/prog/www/WMOCodes/OperationalCodes.html) • Edition 4 in use from November 2005 but use of edition 3 use allowed  until 2012. (Note: A BUFR message shall not mix features of different editions; the content shall be consistent and in accordance with a single edition.) • Version numbers correspond to code table versions. (Master table version is currently 14). • Master table versions up to and including version 13 are a superset. • A further discussion of tables will be included in metadata. Global Systems Division (GSD) Earth System Research Laboratory (ESRL)

  4. WMO BUFR • BUFR is the name of a binary code for the exchange and storage of data. (Note: Not just meteorological) • The BUFR message consists of a continuous bit-stream made of a sequence of octets (1 octet = 8 bits).  • The terms “BUFR message” and “section” describe logical entities to assist BUFR definition. • A BUFR message consists of one or more subsets of related data defined, described and represented by a single BUFR entity. • The octets of a BUFR message are grouped in sections. Global Systems Division (GSD) Earth System Research Laboratory (ESRL)

  5. WMO BUFR Sections • All WMO TDCF’s break messages into sections. For BUFR these are: Global Systems Division (GSD) Earth System Research Laboratory (ESRL)

  6. Data Description Section • The data description section contains the “descriptors” of data contained in the data section. • Each descriptor shall occupy 2 octets and contain 3 parts: F (2 bits), X (6 bits) and Y (8 bits). • F = 0 is known as the element descriptor that refers to a single element in BUFR Table B. • X denotes the Table B class and Y the entry with that class. • F = 1 refers to replication, F = 2 denotes an operator descriptor and F = 3 denotes a sequence operator. Global Systems Division (GSD) Earth System Research Laboratory (ESRL)

  7. BUFR Table B Example Global Systems Division (GSD) Earth System Research Laboratory (ESRL)

  8. WMO BUFR Issues/Solutions? • Decoding requires access to appropriate tables. • Publish tables in XML • Make all tables available at all National Centers • Format defines no standard way of encoding a given dataset. • Use Templates, i.e. Define the encoding for certain datasets. Global Systems Division (GSD) Earth System Research Laboratory (ESRL)

  9. WMO BUFR Questions? Global Systems Division (GSD) Earth System Research Laboratory (ESRL)

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