Discovery Metadata. Currently Discovery Metadata is in two locations Clause 12 Appendix Contains...

Discovery Metadata

Discovery MetadataCurrently Discovery Metadata is in two

locationsClause 12Appendix

Contains similar information

Discovery MetadataAt the S-101 Stakeholders forum in March, it

was proposed that the following should also be considered for discovery metadata:A way to digitally check for the correct Feature

Catalogue and Portrayal Catalogue versionThe ability to insert a corrected through field

that would inform the mariner and port state control which notice to mariner the ENC was corrected to.

Name Cardinality Value Type Remarks

dataSetDiscoveryMetadata - - -

metadataFileIdentifier 1 CharacterString

metadataPointOfContact 1 CI_ResponsibleParty

metadataDateStamp 1 Date metadataLanguage 1 English CharacterString All data sets conforming to S-101 PS

must use English language

fileName 1 CharacterString Dataset file name

filePath CharacterString Full path from the exchange set root directory

abstract 1 CharacterString Short description of the area covered by the dataset. For example, harbor or port name, or area between two named locations.

Name Cardinality Value Type Remarks

featureCatalogueVersion 1 CharacterString Version of the S-101 Feature Catalog that is in use with this product specification.

potrayalCatalogueVersion 1 CharacterString Version of the S-101 Portrayal Catalog that is in use with this product specification

updateCorrection 1 CharacterString Notice to Mariner that the update corrects the ENC through. This would be used for port state control to verify if the ENC is up-to-date to notice to mariner items.

compressionFlag 1 {1} to {2} CharacterString 1. Yes2. No

algoritymMethod 1 CharacterString ZIP, RAR, etc.sourceMedia 1replacedData 1 If a data file is cancelled is it

replaced by another data filedataReplacement Cell name

Decisions for ConsiderationCombine the content of both tables and place

in Clause 12 – metadata. This will make maintenance easier

Review the proposed combined table to ensure that what is currently documented is correct.

Review and approve the proposed additions to the discovery metadata.

Propose additional fields for other types of metadata.

Discussion questionsShould TSMAD/DIPWG use the language in

the IEC 66225 VDR specification in regards to support file formats or should S-101 specify file types.The IMO VDR states the following:

The software should be compatible with an operating system available with commercial-off-the-shelf laptop computers and where nonstandard or proprietary formats are used for storing the data in the VDR, the software should convert the stored data into open industry standard formats.

Discussion questionsIf file types are specified, what formats

should be supported to make S-101 future proof?TextHTMLAudioVideo

What are the appropriate Audio and Video Formats?

Discussion QuestionsIn regards to support file management,

should S-101 specify the implementation or just specify that redundant files are deleted?

Discussion QuestionsWhat information regarding support files

needs to go into the S-101 Discovery Metadata and S-101 Catalogue file?

BackgroundAt CSMWG 18 it was suggested that simplified

symbology has very little acceptance by the mariner at the following options should be explored:Option a) delete simplified symbolsOption b) delete simplified symbols and redefine

traditional symbols as colouredOption c) declare simplified symbols as a

voluntary optionIt was also suggested that Colour Palattes be

investigated also

BackgroundAdditionally, NOAA also asked a question

regarding the display of M_QUAL and CATZOC

BackgroundApproximately every year NOAA conducts a

user survey that reaches the following groups:• AMERICAN PILOTS’ ASSOCIATION 1,200 MEMBERS

• LOCAL PORT AUTHORITIES 40 LOCATIONS

• MASTER AND MATES UNION 3,000 MEMBERS

• US POWER SQUADRON 6,000 NAMED CHART USERS

• US COAST GUARD AUXILIARY 3,000 NAMED CHART USERS

• US COAST GUARD 1,400 NAMED CHART USERS

• US NAVY 300 US SHIPS

• AMERICAN WATERWAYS ORGANIZATION NAMED OPERATORS

• TUG AND BARGE COMPANIES 5,000 TUG BOATS

• WORKBOAT COMPANIES 100 COMPANIES

• LAKE CARRIERS ASSOCIATION 12 COMPANIES

Q.19 IF HYDROGRAPHIC SURVEY QUALITY AREAS COULD BE PORTRAYED WITH THE STARRED SYMBOL OR THE YEAR OF THE SURVEY AND THE ZONE OF CONFIDENCE (CATZOC). WHICH OF THESE DO YOU PREFER?

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Q.20 THERE ARE TWO TYPES OF ECDIS BUOY SYMBOLOGY – TRADITIONAL AND SIMPLIFIED. WHICH OF THESE DO YOU PREFER?

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Q.20B) HOW OFTEN DO YOU NAVIGATE AT NIGHT?

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Q.20A) WHICH ECDIS COLOR PALETTE DO YOU PREFER TO USE TO NAVIGATE AT NIGHT?

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PREFERENCE

Q.20A) WHICH ECDIS COLOR PALETTE DO YOU PREFER TO USE TO NAVIGATE AT NIGHT?

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RECREATIONAL COMMERCIAL

QuestionsShould Simplified Symbols be retained for S-

101?What is the benefit that S-101 will gain from

reducing the number of palattes?

Discussion QuestionsHow are the SI and SD datasets related?

How does one ensure that an SI feature doesn’t exist in an SD dataset or vice versa?

Discussion QuestionsHow will portrayal work?

Portrayal of SI and SD data togetherPortrayal of one area that has SI and SD data

adjacent to an area that does not

Discussion QuestionsHow will distribution work?

Discussion QuestionsHow will updates work?

Sometimes an update will affect both SI and SD data – are they packaged together and released simultaneously. What happens if the end user only gets updates to the SI data and not the SD data?

Discussion QuestionsWould TSMAD consider multiple SI cells by different themes?Eg. An SI cell that contains only TSS

information and a SI cell that contains Aids to Navigation. These would have to be related in some way. Can the same association cover two different datasets?

Discussion QuestionsCan the perceived benefits be achieved in another way?

ConsistencyISSUE In S-

101Comment

Compilation Scale versus Display Scale

Yes This is now set as spatial resolution and is aligned with the standard RADAR ranges. Need to consider changing CSCL to DSCL (Display Scale) in the 8211


101Comment

Guidance on the use of M_CSCL

No Does TSMAD need to mandate this


101Comment

USAGE Band Assignment

No Usage bands are to be utilized for catalogue purposes only and will not have a display scale attached

Need to be harmonized in the discovery metadata.


101Comment

SCAMIN Yes SCAMIN that is now in S-65 will be incorporated into S-101.

Recommendation for which section?


101Comment

Data Inconsistencies across usage bands

No How does TSMAD prevent this?


101Comment

Contour Intervals

No Mandate that contour intervals align with S-4*

*the United States(NOAA) objects


101Comment

Inconsistent Depiction and misalignment of data at cell boundaries

No Can S-101 fix this or is this encoding guidance?


101Comment

Inconsistent Depiction of Data within a cell

No Can S-101 fix this or is this encoding guidance?


101Comment

Holes in Data coverage

Yes This should be resolved by the new display scales.


101Comment

Use of CATZOC in M_QUAL

No Possibly remove unassessed as an allowable enumeration


101Comment

Data Gaps and overlaps

No Need to establish rules for the handling of gaps and overlaps.


101Comment

Strengthening Encoding Rules in the UOC

Yes Intention is to Mandate

Even more outstanding issue/questions that need to be answered….

Aggregated Feature Types

ENC Data SetS-101 Section

S-101 Section Header

S-101 Text and/or Issue S-101 Questions

4.6 ENC Data Set An data set is a collection of geo-referenced cells containing geographic features that are used to fully describe the physical marine environment for the safe passage of vessels.

Is this clause needed? As S-101 is more specific in clause 11.3.1 Datasets?

CellsS-101 Section


S-101 Text and/or Issue

S-101 Questions

4.7 Cells Features with the geometric properties of point or line coincident with the border of two cells within the same layer and with the same display scale must be part of only one cell.

What is the intent of the phrase “within the same layer?” Can this be removed?

GeometryS-101 Section

S-101 Section Header S-101 Text and/or Issue S-101 Questions

4.9 Geometry The following is currently stated in S-101:The underlying geometry of an will be constrained to S-100 level 3a which supports 0, 1 and 2 dimensional objects (points, curves and surfaces). The third dimension is expressed as an attribute of a feature.

Is this also valid for soundings? If so, TSMAD needs to explicitly state this.

GeometryS-101 Section


4.9 Geometry Despite the saving in data volume offered by the use of arcs/curves, the disadvantages are such (e.g. during updating, generating warnings/alarms) that they must not be used for ENC.

How does this fit in with the use of GM_Curve in the Figure and “curves” in the previous issue above?S-101 Work Item Leader recommendation: Remove this paragraph as S-101 is only to state what is allowed, but need to explain the use of GM_Curve.

Units of MeasureS-101 Section



5.4 Units of Measure Units to be used in an ENC:Position: latitude and longitude in decimal degrees (converted into integer values).Depth: metres.Height: metres.Positional accuracy: metres.Distance: nautical miles or metres. Time: seconds.Bearings: decimal degrees.

Is this correct? What about angular measure?

PositionsS-101 Section



5.4.1 Positions Positions are in WGS84 and coordinates are held in the Data Set Structure Information field under coordinate multiplication factor for X, Y and Z coordinate. Coordinates must be held in production systems at a resolution of 0.0000001 (10-7) and the coordinate multiplication factor value should be set to 10000000 (107) for all cells.

This is what is currently in S-101. COMF has been divided into three fields for X,Y and Z. The question is where does S-101 specify the resolution:a.In the main body of the product specb.In the 8211In addition, is the spatial resolution the same for X,Y, and Z?

DepthsS-101 Section



5.4.2 Depths Depths are converted from decimal meters to integers by means of the 3-D (Sounding) Multiplication Factor. Soundings are never encoded with a resolution greater than one decimetre, so the value of sounding multiplication factor must be 10. For update cells, ‘Coordinate Multiplication Factor’ [X], [Y] and the ‘3-D (Sounding) Multiplication Factor’ [Z] will not be present. In this case, the values from the original base cell should be used.

How do we state this for Depths as the second paragraph is no longer a valid statement. COMF has been split into CMFX, CMFY, and CMFZ.

Data MaintenanceS-101 Section


8 Data Maintenance Is what is in this section enough, does TSMAD need to add more. How do S-58 validation checks fit into S-101?

ImplementationS-101 Section


11.1 Implementation The binary implementation of S‑101 must be used for ENC. Therefore, the “Implementation” [IMPL] subfield of the “Catalogue Directory” [CATD] field must be set to “BIN” for the data set files.

Where is this actually set? Is this still needed? If so, is it needed in the 8211 or in the main part of the PS.

ENC Cell NamingS-101 Section


11.3.3 ENC cell naming What needs to go into the cell name? Does TSMAD need to limit it to 8 characters?

At the S-101 Stakeholders meeting there was thought to including the display scale in the name for cataloguing purposes?

S-101 Section



11.3.4 New Editions and Updates

This section describes how the standard encoding defines updating methodologies for cells. In order to ensure that feature type updates are incorporated into an ECDIS in the correct sequence without any omission, the file extension and a number of other parameters encoded in the data are used in the following way:file extension every new data set or new edition must have a .000 extension as per the translation from EDTN to the file extension. For update cell files the extension is the value of the UPDN field, ranging from .001 to .999. These numbers must be used sequentially, without omission. Number .001 is the first update after a new data set or a new edition. edition number when a data set is initially created, the edition number 1 is assigned to it. The edition number is increased by 1 at each new edition. update number update number 0 is assigned to a new data set. The first update cell file associated with this new data set must have update number 1. The update number must be increased by one for each consecutive update, until a new edition is released. The new edition must have update number 0. In the case of an update cell file the file extension is the same as the update number.update comment comment for describing the change introduced by an update. issue date date up to which the data producer has incorporated all applicable changes. In order to cancel a data set, an update cell file is created for which the edition number must be set to 0. This message is only used to cancel a base cell file. Where a cell is cancelled and its name is re used at a later date, the issue date must be greater than the issue date of the cancelled cell.Maintenance of support files is described in S-100.

In this section, a small workgroup added the update comment field that describes the change added by the update.There are also outstanding issues on how to update support files that need to be discussed.

Discovery Metadata. Currently Discovery Metadata is in two locations Clause 12 Appendix Contains...

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