Digital Geographic Information Working Group DGIWG

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Digital Geographic Information Working Group
(DGIWG)

• Background Information for the Joint Steering
  Group on Spatial Standardization and Related
  Interoperability

Herman Dohmann, C/TC
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DGIWG

• Quasi-NATO organization established in 1983
• NATO emphasis -Membership beyond NATO
• Standardization to support Interoperability, data
  exchange, data access, and burden sharing
• Creating, adopting, profiling, and maintaining
  standards and product specifications
• Harmonization/migration military, national,
  regional, and international standards
• Coordination of National Initiatives
• Forging co-production opportunities

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DGIWG Organization
Steering Committee - Chaired by UK (Brig P.
Walker) (Steering Committee Strategy
Sub-Group) Technical Committee - Chaired by US
(H. Dohmann) Specific Working Parties (WP) -
Chaired by various nations
Current membership 17 nations (membership is
anticipated to expand to 20 over the next year)
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DGIWG Activities

• Current WPs - DIGEST, FACC, Metadata, Data
  Quality, Portrayal, Services, (Hydrographic)
• Other technical activities - Coordination of
  national initiatives (digital reproduction
  materials, sample data, matrix data requirements,
  modeling and simulation, transport and logistics
  dataset, gateway services- data warehouse
  access, and various STANAG product development,
  etc)
• Liaison/support - NATO Geographic Requirements
  WG NATO Geographic Conference Interservice
  Geographic WG (STANAGs) NATO AG IV 5 Nations
  Conference ISO TC 211 Open GIS Consortium
  International Hydrographic Organization and VMap
  Co-production WG

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DIgital Geographic information Exchange STandard
(DIGEST)

• In 1991 DGIWG developed DIGEST to support
  interoperability, data exchange, and
  co-production
• STANAG 7074 US - DIGEST Custodian
• Comprehensive and evolving family of standards
  supporting current and emerging requirements
• Supports raster, vector, and matrix data exchange
• Consistent metadata across various encapsulations
• Backed by production
• DIGEST 2.0 (June 1997) DIGEST 2.1 (end of Sep
  2000)

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DIGEST has been the Basis

• Harmonizing military, national, and
  international standards
• Supporting Interoperability, data exchange,
  burden sharing
• Co-production VMap, DNC, raster formats
• Various national and commercial developments
• Supporting Geo-referencing requirements
• NATO Secondary Imagery Format (NSIF)
• Shuttle Radar Terrain Mission
• Addressing a number of common emerging
  requirements
• New products - FFD, TOD

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Parts of DIGEST

• Part 1 - General description/overview
• Part 2
• Theoretical model
• Exchange structure
• Encapsulations
• Part 3 - Geodetic Codes and Parameters
• Part 4
• Feature and Attribute Coding Catalogue (FACC)
• Over 400 features, 500 attributes, 3600 values
• Supports a wide variety of applications

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Encapsulations of DIGEST(defined in DIGEST Part
2)

• Annex A
• Run-length encoding (ISO 8211)
• Producer to Producer exchange
• Annex B
• Based on ISO 8824 format
• Support exchange via telecommunication
• Annex C
• Vector Relational Format (VRF) - table structure
• US Vector Product Format (VPF) subset of VRF
• Support end users (through products)

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Encapsulations of DIGEST(defined in DIGEST Part
2)

• Annex D
• Image Interchange Format
• Based on the NATO Secondary Imagery Format
• Consistent to ISO Basic Imagery Interchange
  Format
• Defines the parameters to Geo-reference imagery
• Annex E
• Standard ASCII table on contents
• Contents of transmittal
• Defines DIGEST database

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DGIWG Goalsin ISO TC 211

• "DGIWG participation in ISO TC 211 - Geographic
  Information/Geomatics is consistent to the
  overall DGIWG goals of Interoperability and
  Burden Sharing
• Promoting DIGEST use / data availability
• Promoting ISO based Commercial applications in
  the Military
• Influencing the ISO development to support
  interoperability
• Utilizing ISO developments to satisfy emerging
  requirements
• Redefining DIGEST based on ISO/TC 211 standards
• Achieving ISO compliance of DIGEST
• Supporting the maintenance and evolution of
  DIGEST
• Encouraging cooperation between ISO TC 211 and OGC

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DGIWG interoperability interests

• Relationship/compatibility of FACC to EDCS
• Relationship/compatibility of DIGEST to SEDRIS
  format
• Overlap of SC 24 BIIF activities with ISO/TC 211
• NSIF - DIGEST Geospatial support extension
• Certification activity at JITC
• SEDRIS activity in NATO
• DGIWG New Work Item proposals in ISO/TC 211
  touches both ISO communities
• Geodetic Codes and Parameters
• FACC Data dictionary