Bathymetric Product Specification TSMAD 20 Rostock, May 2010 CHS and NAVO

Overview Context of Bathymetric Product Specification Proposed Drafts S10x/S102 Specifications as initiated by TSMAD 18 S10x Guidelines and Considerations as initiated by TSMAD 19 Proposed next steps

Context of Bathymetric Product Specification Original proposals to TSMAD 18 from : NAVO (S.102) – Ref. Open Navigation surface project Objective: common bathymetric standard for multipurposes data sharing and dissemination CHS (S.10x) Objective: to meet navigation needs with high definition bathymetry and integrate with other data types (Note that this original objective changed after the HSSC meeting in October 2009) CHS and NAVO worked on convergence of the two proposals Investigate and build on strengths of both proposals

S102 and S10x De-confliction CHS and NAVO agreed to: Separate the encoding of carrier and data content A need for common content model for bathymetric data fitting S.100 and carrying appropriate metadata Metadata of S.102 already fits S.100 Consider a few different encoding scheme HDF5 (already used in BAG) GeoTIFF32 (widely used) JPEG2000 (interesting potential) Prepare for the venue of auxiliary information

An initial draft version of S.10x was prepared to be more general structure for Auxiliary Information Layers using different coverages Specifically the draft of S.10x provides a structure for tiling, common metadata, digital security and common referencing that is used by S.102 This draft has been made available as a discussion document (Proposed Specification for Auxiliary Information Layer Integration for use with ENC S.10x) A revised S.102 was prepared built on top of S.10x to be specific for bathymetry using a gridded coverage S102 and S10x De-confliction

S10x components to support S102 In parallel, CHS developed an initial draft version of S.10x (as a separate product specification from S.100) that supports the proposed the S.102 document. This document was built directly upon the S.100 and the ISO models. It allows: Allows different coverage (uniform grid, quad tree grid, TIN, point coverage, vector field point) Partitioning (Tiling) Model Metadata Model Data Certification and Rights management Multiple encodings As needed in S.102

S10x Guidelines and Considerations as initiated by TSMAD 19 Action TSMAD 19 to... develop a paper outlining how how multiple Layers of S-100 compliant Auxiliary Navigational Information can be integrated with S-101 ENC data... Discussion Paper Requirements for the Integration of S-100 compliant Auxiliary Navigational Information with S-101 ENC data. This document sets out metadata requirements and issues for linking data products in layers including addressing updating scenarios, query precedence, and presentation issues.

S10x Meta Data Requirements Abstract Intended Use ( route planning, safety, security, navigation,…) Intended usage Start Intended usage End Minimum Scale Maximum Scale Information Type (Overlay, Extension, new product) Intended interaction (Overlay, interleaved, supersedes) Dependencies Identification of feature catalogue Identification of portrayal catalogue Product category - (HD data, Tides, Aids, ….) Product query precedence C-Square location identification

S10x Considerations Links between data across products, Geo- Referencing Updating Scenarios and Implications Query Precedence logic for pick report Display Priority Presentation Compatible Reference Models

Proposed Next Steps Development of S10x use cases –Simple overlay –Extension to existing product spec. (e.g. AML) –Additional PLA with integrated vertical data column IMO submission – proposal to allow auxiliary information to adjust the water column dynamically

Proposed Next Steps Need to review S.102 to assure independence, but assure S.10x considerations have been addressed. The draft of S.102 is proposed to be circulated for review, suggestions, recommendations. Additional encodings need to be provided for S.102 and testing needs to be done. The draft discussion paper of S.10x needs to be enhanced to address the requirements as outlined in the S.10x requirements paper and scope modified as deemed necessary by TSMAD. Follow-on meetings need to be arranged to discuss the guidelines for Auxiliary layers and the proposed approach given in the S.10x document.

Recommendations S10x specification is more suited to an annex to S100 as users need to take into consideration S10X when building product specifications. Appoint a person/group to look at portrayal issues for interdependent product specifications before entry into the registry