International hydrographic organization specifications for chart content and display aspects of ecdis
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S-52 Appendix 2 - IHO
| 1.4 Structure of the Specifications 1.4.1 S components These Specifications consist of the following components (see Figure 2): .1 The Specifications for Chart Content and Display Aspects of ECDIS, which describes the requirements and methods in relatively general terms. .2 Annex A, the Presentation Library as a separate document, which gives full 7 S, Edition 6.0 March 2010 details of colours, symbols, symbolization instructions, etc. together with guidance on how an ENC should be displayed. A digital version is also available with Edition 3.4. Annex A itself consists of three components - Part I contains chart objects - Part II contains Mariners Navigational Objects, such as the own ship symbol, tracks, waypoints, time tags, etc. - The third component is the addendum to Part I which is a paper based description of the symbol library as graphics. The ECDIS Chart 1 is issued together with the Presentation Library as a graphic file and is also available as a collection of the varying objects contained in a special cell in S format containing generic feature objects. .3 Annex B, which specifies procedures for initial colour calibration of displays and the verification of that calibration. .4 Annex C, which specifies a procedure for maintaining the calibration of displays. .5 Appendix 1, Guidance on Updating the Electronic Navigational Chart. Figure 2 - S Document Structure 8 S, Edition 6.0 March 2010 1.4.2 Presentation Library and its status The Presentation Library links every object class and attribute of the SENC, including the IEC Mariner's Navigational Objects, to the appropriate presentation on the ECDIS display. It carries all the details of these specifications, organised as shown on figure 2. A digital version in .dai format containing the Symbol Library, Colour Tables and Lookup Tables is provided as a manufacturer's option for edition 3.4, but may not be provided for succeeding editions. Note that the Presentation Library contains some features and procedures which are not required in the IMO standards or IEC specifications, such as four depth shades, etc. These are identified, and their use is optional. References to the Presentation Library in this document refer to its Part I unless otherwise stated. 1.4.3 Amending the Colour & Symbol Specifications and the Presentation Library 1.4.3.1 In the life of each edition of S, amendments to the structure of the Presentation Library which might affect the ECDIS software (for example changing the number of fields in the lookup tables, or changing the logic of a conditional symbology procedure) will be avoided as far as possible. However incremental changes to detail in these Specifications and the Presentation Library will be required. Ina major revision, changes in structure will be made if necessary. Details of the amendment process are given in 1.4.4 below. 1.4.3.2 The current editions of S remain in force until the issue of either a) an immediate correction which is essential for reasons of safety of navigation, orb) anew edition which is identified as bringing outstanding deferred amendments into force. Either of these will result in anew edition of these Specifications and/or the Presentation library, whichever is affected. Download 0.98 Mb. Share with your friends:
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