ABSTRACT: The International Hydrographic Organization (IHO) has established a new hydrographic information standard, the S-100 standard. This standard applies the ISO 19100 series to the legacy hydrographic exchange standard in order to overcome the limitations of existing hydrographic information expression. The first version of the S-100 standard was released in 2010, and the latest version, 5.0.0, was released in 2022. The International Maritime Organization (IMO) officially adopted the IHO's S-100 for hydrographic information exchange. The S-100 standard is the base standard, and each hydrographic information is developed as a document called the product specification. The product specification is being developed and led by various standardization organizations. The product specifications developed by each standardization organization are based on S-100, but they are defined in various ways according to the characteristics of information and expression methods. In this paper, the different product specifications of IHO's S-12x series and IALA's S-2xx series are analyzed in terms of features and classes from the data model point of view. The analysis of the feature, attribute, and feature relationship of each product specification was conducted by reviewing both the Data Classification and Encoding Guide (DCEG) and the entire document of the product specification. This study has identified areas of overlap in S-100 product specifications and has explored potential solutions to address these issues.

KEYWORDS: IHO S-57, IALA Recommendations, IHO S-100, e-Navigation Strategy, Common Maritime Data Structure (CMDS), Marine Hydrography, Data Classification and Encoding Guide (DCEG), World Meteorological Organization (WMO)

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