Unknown Object Portrayal

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Unknown Object Portrayal
CSMWG16-5.2F

• Version 0.01

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Statements

• We assume that the current presentation library
  deals with the portrayal of approved object
  classes within the S-57 ENC product specification
  edition 2.0 (which is based on S-57 E3.1).
• The subject is how the current presentation
  library MUST portray new objects , new attributes
  or new attribute values introduced by S-57 3.1.1
  enhancements.

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New Object Class

• Portrayal of a non-approved ENC PS object class
  MUST be displayed as an unknown object (Question
  Marks symbolisation)
• The current presentation assumes this requirement
  (8.3.3.7a of PL manual )
• if an ECDIS doesnt respect this statement , it
  is an ERROR.

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Example New Object Class

• Symbolised boundaries option used here to show
  these three unknown features (from 3.1.1)
• One area feature (ARCSLN ) symbolised by
  quesmrk line style for the area and the
  quesmrk centred symbol.
• One line feature (ASLXLN line) is symbolised by
  quesmrk line style.

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New Attribute or new Attribute value
It is my problem I would like to be sure that
it is what it is expected ???

• A valid object class containing an invalid
  attribute or an invalid attribute value MUST be
  portrayed as any other complete valid feature
  according to S-52 PL look up table rules.
• The current presentation library assumes this
  requirement (see 8.3.3.7b of PL manual )
• if an ECDIS doesnt respect this statement , it
  is an ERROR.
• The end user selects the INFORM and or TXTDSC
  attribute using cursor picking action to
  determine what this feature is.

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New Attribute or new Attribute value

• Symbolised boundaries option used to portray this
  restricted area with an unknown value for CATREA
  (28) as any other valid restricted area.
• Symbolised by this line style et a centred symbol
• No portrayal indication is given to detect that
  this attribute is not valid.

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PROPOSAL

• If we agree with this current way to portray not
  valid object for ENC purpose
• IEC statement 6.5.1c Must be replaced by
  something like Load an ENC containing an
  object class not valid for ENC purpose, i-e an
  object, not recognised by the presentation
  library Check that the symbol magenta ? occurs
  at the indicated position....

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Second option

• A feature with a valid object class but encoded
  with an invalid attribute or an invalid attribute
  value MUST be portrayed as an unknown object
  (Question Marks symbolisation)
• The current presentation library doesnt assume
  this requirement (we will have to change it)

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Second option for New Attribute or new Attribute
value

• Symbolised boundaries option used to portray this
  restricted area with an unknown value for CATREA
  (28) as an UNKNOWN OBJECT
• symbolised by quesmrk line style and the
  quesmrk centred symbol.

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SECOND OPTION

• Consequences
• IEC statement 6.5.1c Must be replaced by
  something like Load an ENC containing an
  object not valid for ENC purpose, i-e an object ,
  attribute or attribute value not recognised by
  the ENC product specification Edition 2.0 Check
  that the symbol magenta ? occurs at the
  indicated position ....
• Update Presentation Library Display Generator
  as following
• Get the object from the SENC .
• Is the object valid for ENC purpose ?
• If yes , Go ahead with the current mechanism
  (...).
• If no ,
• is it a prohibited object (RIVERS-...) ?
• if YES, reject (ignore),
• If NO, It is really a no valid object gt add
  directly display instructions to portray the
  object as an unknown object without taking
  account about portrayal rules from LU tables

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Unknown Object Cursor Picking

• Version 0.01

12
New Statements

• Unknown Object Class
• Cursor Picking Result should identify the unknown
  object as an unknown object class for ENC
  purpose
• All valid attributes and attribute values for ENC
  purpose should be available for the mariners.
• Valid Object Class but Unknown attribute
• Cursor Picking Result should identify this
  unknown attribute as an unknown attribute for
  ENC purpose
• All other valid attributes and attribute values
  for ENC purpose should be available for the
  mariners. INFORM and or TXTDSC should explain
  information in unknown attribute.
• Valid Object Class, valid attribute but Unknown
  attribute value
• Cursor Picking Result should identify this
  unknown attribute value as an unknown attribute
  value for ENC purpose
• All others valid attributes and attribute values
  for ENC purpose should be available for the
  mariners. INFORM and or TXTDSC should explain
  information in unknown attribute value.