1. Report of the Data Quality Working Group
Hydrographic Services and Standards Committee
Report of the
Data Quality Working Group
Presented by Rogier Broekman, Chair
HSSC-10, Rostock-Warnemünde, Germany, May 2018

2. Principal activities and achievements
Membership
15 Member States (Canada, Denmark, Japan, Indonesia joined)
4 Expert Contributor (PRIMAR, IC-ENC joined)
Meetings
DQWG-13, January 2018, IHO Secretariat, Monaco
Letters
01/2018: Data Quality Checklist
02/2018: Methodology for the display of quality information
HSSC-10, Rostock-Warnemünde, Germany, May 2018

3. Principal activities and achievements
Two day workshop at meeting 13
Review of section of the data classification and encoding guide
Best practices on the use of CATZOC by HO’s
How HO’s, members of DQWG allocate CATZOC values (S-57)
How HO’s, members of DQWG will allocate Quality of Bathymetric Data values (S-101)
Development of a data quality checklist (DQWG Letter 01/2018)
Consider mismatch between S-44 and CATZOC
Reviewed S-100 based product specifications (NIPWG, TWCWG, S-102)
HSSC-10, Rostock-Warnemünde, Germany, May 2018

4. Principal activities and achievements
DQWG WORK PLAN
Task
Work Item
Priority
Status
Remarks
A.1
Develop checklist on data quality components
High
Ongoing
Publication at HSSC-11?
B.1
Review S-101 Data Classification Encoding Guide
Complete
Delivered to S-100 WG
D.1
Collect best practise of the use of CATZOC from HO’s
Received and used at
DQWG-13.
D.4
Collect best practise on how to assess ZOC from surveys
Medium
AU, FR, US provided.
HSSC-10, Rostock-Warnemünde, Germany, May 2018

5. Problems or outstanding issues
Many comments on S-67 draft – rework is needed. (ref HSSC 9/36)
Title of S-67 changed to “Mariners Guide to the Accuracy of Depth Information in Electronic Navigational Charts.”
Various definitions and meanings of the words accuracy and uncertainty in IHO documents and their usage.
Need to get in touch with ECDIS producers and end users to get their input on methodology for the display of quality information.
HSSC-10, Rostock-Warnemünde, Germany, May 2018

6. Problems or outstanding issues
FUTURE
Dilemma between harmonized encoding of quality information and the allowable input into a datamodel.
HO’s use workarounds in current S-57 model.
Harmonized encoding is a non-HSSC issue.
S-57, encoding is harmonized
S-101, encoding is harmonized
S-57, encoding not harmonized
S-101, encoding not harmonized
NOW
HSSC-10, Rostock-Warnemünde, Germany, May 2018

7. Future work programme (1)
DQWG WORK PLAN
Task
Work item
Priority
Status
Remarks
B.2
Development of a “minimum” standard for data validation in S-1xx based products
High
Ongoing
Ref HSSC9/16
C.1
Review S-100 section 4C
Related to DQ Checklist
D.2
Provide recommendation for a guidance documentation on how to populate CATZOC values
Medium
Planned
Ref IHO CL 50/2017
D.3
Provide guidance documentation on the transition from S-57 CATZOC to S-101 Quality of Bathymetric Data
DQWG meeting 14
D.5
Development of a Minimum Standard for Data Validation
After completion of DQ Checklist
HSSC-10, Rostock-Warnemünde, Germany, May 2018

8. Future work programme (2)
DQWG WORK PLAN
Task
Work item
Priority
Status
Remarks
E.1
Submit Edition of S-67 for endorsement by HSSC.
High
Ongoing
HSSC-11 submission
E.3
Consider a video version of S-67 when approved by MS
Medium
Planned
Include S-101?
F.1
Continue development of Portrayal Methodology of bathymetry quality in S-101
Paper: Methodology for the display of quality information
F.2
Invite industry partners (ECDIS producers) and end users to get their input on methodology for the display of quality information
DQWG-14 invitation
HSSC-10, Rostock-Warnemünde, Germany, May 2018

9. HSSC-10, Rostock-Warnemünde, Germany, 14 -17 May 2018
Items of Note
DQWG Reference Documents
-> HSSC -> DQWG -> Reference Documents
National Methodologies from survey data to CATZOC values
National Methodologies how to generalize quality information at various scales (planned)
Invite other HO’s / Regional Hydrographic Commissions to share their internal guidelines.
Next meeting: 5-8 February 2019, IHO Secretariat, Monaco
HSSC-10, Rostock-Warnemünde, Germany, May 2018

10. Action requested of HSSC
Note this report;
Approve the title of S-67;
Endorse the tasks in the DQWG Work Plan
HSSC-10, Rostock-Warnemünde, Germany, May 2018