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Land Cover spatial datasets harmonization in Portugal using HALE

Teresa Zuna, Alexandra Fonseca, Danilo Furtado, Ana Luisa Gomes and André Serronha

(Submission #225)


One of the main challenges of the INSPIRE Directive is the application of the data harmonization procedures to reach data compliance with the INSPIRE data specifications. The Thematic Working Groups (GTI-TE) created in 2010, grouping the Portuguese public authorities responsible for the production of spatial data sets related to specific INSPIRE themes, were now restructured according to EC thematic clusters and a new dynamic was promoted aiming to reach INSPIRE compliance. The 9 GTI-TE are the collaborating and sharing structures related to spatial data sets and services produced by public entities, with special relevance to the harmonization issues. This paper analyses the harmonization process and the main challenges that emerged from the practical implementation of INSPIRE spatial data harmonization to the Portuguese Land Cover 2010 cartography (COS 2010). COS is one of the spatial datasets produced by DGT with major relevance for the environmental and planning activities in Portugal. The harmonization process included different phases starting with the analysis of the INSPIRE directive standards and specifications for the II.2 Land Cover (LC) theme. A review of methodologies and tools was performed that considered the data models (UML), the spatial data transformation tools (e.g. HALE, FME) and its application. The process of validating the harmonization results was also analyzed, taking into account the methodologies recommended by the INSPIRE Directive, the Abstract Test Suit (ATS) included in the data specifications, the types of tests to be performed (e.g. xsd; gml Schematron; thematic shematron) and the available validation tools (e.g. XML Spy, Oxygen XML Editor, eEnvPlus). DGT validation experience obtained in collaboration with the eENVplus validation team, during the EAGLE 6 project, was a major contribution to this task. The harmonization process implied creating a matching table establishing the correspondences between COS 2010 attributes (source schema) and II.2 LC theme data specifications attributes (target schema). The Humboldt Alignment Editor (HALE) transformation tool was used to produce a GML file according to INSPIRE. The validation of the harmonization results followed the ATS defined in the LC data specifications. More than one validation tool was used, Oxygen and eENVplus, with different validation files (LandCover.xsd, GML and thematic Shematron) to perform the different types of tests. The identified errors and their correction were documented. The ultimate goal was to obtain the INSPIRE GML version without errors and to contribute to the collection of best practice examples that aim to support the work of the GTI-TE.


Topic Area:  [2.6] Challenges in creating spatial environmental (reference) data sets
Abstract Type:  Oral Presentation

Additional fields

Comments:   INSPIRE, SDI, Spatial data harmonization, HALE, Land Cover

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