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S-63 / S-101
S-63 Current Status and
Areas for Improvements
DPSWG7-04B
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Current distribution structure
- Unencrypted cell encoding (iso8211)- Basic CRC value per cell
- Collection
- Structure
- Geometry
- Data dictionary
- Update Methodology
- Cell Encryption
- Cell Compression
- Digital Signatures
- Media Layout- ECDIS Service Aspects
S-6
3
S-57
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Current Status
S-63 Edition 1.0 stable and being used by
multiple data servers
Edition 11. being rolled out and used by
type approval authorities for new ECDIS
Supported by clear documentation and
comprehensive test dataset
Much experience now within data servers
in dealing with issues surrounding S-63
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S-101 structure
Better defined structure Emphasises interoperability
Data structure resembles iso19xxx series of standards
UML descriptions for all essential structures
Separation of carrier from content Allows for multiple encodings Example encoding included with S-101 specification
Identifies the data
Dynamic registries Dynamic registry for objects / attributes
S-63 areas No defined compression, encryption or authentication
Basic integrity check could be at object level as well as celllevel.
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S-63 areas for improvment
Dataset size Currently 9 CDs (UKHO)
Considerable redundancy (~50%) in binary encoding
Large number of intermediate directories ~40,000
Differing implementations
Different implementations/sources of metadata Cell boundaries
Edition numbers
Catalog.031
Auxiliary files
Products.txt
Different behaviour wrt multiple data server environment - certificates
Loading times Related to dataset size and underlying data structure
Are there ways S-63s provisions could speed up data loadingcompared to other formats?
No specific provisions for online distribution of data
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Other considerations
Encoding SENC currently fragmented and not universally accepted
Better formats may exist offering benefits to mariners
Data Distribution Models
Many different distribution models exist Desire to create Value Added Services exists in the market
Need to encompass other formats
Other aspects are important, e.g IMO number reporting,manufacturer id/model capturing
Data integrity improvements Current integrity measures only exist at cell - file level which
imposes restrictions on distribution models
We need to span move to online distribution within S-101
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S-63 opportunities Re-use S-63 ed 1.* structures
Some structures clearly work, permits, compression Some could be improved, certificate implementation, metadata
Define better encodings We are not bound to using the underlying 8211 encoding as a base
Can reuse cell encoding for file based transfer
Can define online transfer encoding of objects and attributes
Can tailor encoding(s) to OEM-like structures
Structure metadata Consolidate existing structures catalog.031, products.txt, media.txt, serial.enc,
status.lst etc
Better define service
Reduce size of dataset Better compression key to online takeup
Proliferation of vessel broadband will remain slow globally Implement expandable standards
Can allow for multiple encodings
Standard requirements must be in place to allow hydrographic officerequirements of data integrity and copy protection