CEOS ICF

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CEOS ICF
BaseBand Data Archive InterChange Format
Gian Maria PinnaESA/ESRINGianMaria.Pinna_at_esa.int
CCSDS Panel 2 meeting AMES - 16 May 2001
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ICF development

• Developed by the CEOS WGISS DS ATT
• CEOS Committee on Earth Observation Satellites
• WGISS Working Group on Information Systems and
  Services
• DS Data Subgroup
• ATT Archive Task Team
• ESA in charge of ICF generation
• Demo translation SW (FRED ? ICF ? WILMA)

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Main Concepts General Requirements

• Make exchange of archive data among facilities
  easier
• Decrease the number of archive format translators
• BaseBand compliant

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Main Concepts - Properties

• Interchange
• BaseBand data concept
• Multi-missions and multi-sensors
• Extendibility
• Hardware/software and OS independence

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Format Overview

• Hard-disk organisation (normative)
• File naming convention (character set and XML
  extension)
• lt 2 gigabytes (RID issued)
• Magnetic tape encapsulation (informative)
• No hardware compression
• lt 2 gigabytes
• Network transfer (informative)

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Metadata File

• CEOS ICF metadata file format is XML

• XML namespace
• Http//wgiss.Ceos.Org/ceos-icf/ceos-icf-v1.0-09042
  001 (TBC)

• Validation (XML schema)
• Http//wgiss.Ceos.Org/ceos-icf/ceos-icf-v1.0-09042
  001.Xsd (TBC)

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Metadata File - Markups Convention

• Characters are always lowercases
• Words are separated by an underscore
• Abbreviations and acronyms only with set of
  initials

? Sample of correct CEOS ICF markups
(informative)   ltceos_icfgt ltnssdc_identifiergt lt
sensorgt ltelement_setgt  
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Metadata File - Extendibility

• Only  add information  to keep CEOS ICF
  integrity
• Removing a mandatory element is forbidden
• Usually for specific parameters
• Extend using other XML namespaces

? Correct sensor extension (informative)   ltsenso
rgt ltnamegtHRVlt/namegt ltnumbergt2lt/numbergt
ltspotmirror_step value23/gt
ltspotsensor_modegtXIlt/spotsensor_modegt lt/sensorgt

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Metadata File - Reference Systems

• Units expressed in SI from the BIPM (m, kg, s,
  etc.)
• World geodetic system 1984 (NIMA)
• Universal time coordinated (UTC) from the BIPM

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Metadata File - Built-in Data Types

• Integer
• Timeinstant (UTC and ISO-8601)
• String (universal code set - ISO-10646)
• Double (IEEE 754-1985)
• Urireference (RFC-2396 and RFC-3732)

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Metadata File - UML Model
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Metadata File - Root Element
? Fraction of schema for CEOS ICF Root Element
(normative)   ltxsdelement nameceos_icf
minOccurs1 maxOccurs1gt   ltxsdcomplexTypegt
ltxsdsequencegt ltxsdelement
nameversion
typeversion
minOccurs1 maxOccurs1/gt  
ltxsdelement nameplatform
typeplatform
minOccurs1 maxOccurs1/gt  
ltxsdelement nameprocessing_log
typeprocessing_log
minOccurs0 maxOccurs1/gt  
ltxsdelement namesignal_data
typesignal_data
minOccurs1 maxOccurs1/gt
lt/xsdsequencegt lt/xsdcomplexTypegt   lt/xsdelem
entgt  
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Metadata File - Root Example

• lt?Xml version1.0?gt
•  
• ltCeos_icf xmlnshttp//wgiss.Ceos.Org/ceos-icf-v
  1.0-09042001gt
•  
• ltVersiongt
• lt/Versiongt
• ltPlatformgt
• lt/Platformgt
• ltSignal_datagt
• lt/Signal_datagt
•  
• lt/Ceos_icfgt

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Metadata File - Version element
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Metadata File - Platform Element
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Metadata File - Processing_log element
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Metadata File - Orbit Element
platform
element_set
0..1
orbit
0..1
element_set
0..1
orbit
0..1
number integer
cycle integer
track integer
0..1
attitude_set
0..1
attitude_set
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Metadata File - Signal Data Description
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Signal Data File - Example of Mapping
Signal Data File Record
Minimal repetitive pattern of telemetry
Native telemetry format
Signal Data File format
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Metadata File - Other Elements

• Facility (identifying actors)
• System (identifying hardware, firmware of
  software)

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Signal Data File - Properties

• Binary file (close to telemetry format)
• Sequence of signal data record (minimal
  repetitive pattern)
• No redundancy
• No encryption
• CRC and checksum corrections applied
• Compression (configurable)
• PN decoded
• Frame synchronised
• Chronological order
• Byte aligned (at block levels)
• Only information contained in metadata file can
  be removed

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CEOS BaseBand Archive InterChange Format (ICF)
For more information, please contact Gian
Maria Pinna ESA - ESRIN Tel.
39-06-94180644 Fax. [phone] e-mail
GianMaria.Pinna_at_esa.int and look at ATT Home
Page at http//www.space.dera.gov.uk/ceos/archiv
e_task.html