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Accessing 3D geospatial models, eventually at no cost and for unrestricted use, is certainly an important issue as they becomepopular among participatory communities, consultants, and officials. Various geo-portals, mainly established for 2D resources, havetried to provide access to existing 3D resources such as digital elevation model, LIDAR or classic topographic data. Describing thecontent of data, metadata is a key component of data discovery in geo-portals. An inventory of seven online geo-portals andcommercial catalogues shows that the metadata referring to 3D information is very different from one geo-portal to another as wellas for similar 3D resources in the same geo-portal. The inventory considered 971 data resources affiliated with elevation. 51% ofthem were from three geo-portals running at Canadian federal and municipal levels whose metadata resources did not consider 3Dmodel by any definition. Regarding the remaining 49% which refer to 3D models, different definition of terms and metadata werefound, resulting in confusion and misinterpretation. The overall assessment of these geo-portals clearly shows that the providedmetadata do not integrate specific and common information about 3D geospatial models. Accordingly, the main objective of thisresearch is to improve 3D geospatial model discovery in geo-portals by adding a specific metadata-set. Based on the knowledge andcurrent practices on 3D modeling, and 3D data acquisition and management, a set of metadata is proposed to increase its suitabilityfor 3D geospatial models. This metadata-set enables the definition of genuine classes, fields, and code-lists for a 3D metadata profile.The main structure of the proposal contains 21 metadata classes. These classes are classified in three packages as General andComplementary on contextual and structural information, and Availability on the transition from storage to delivery format. Theproposed metadata set is compared with Canadian Geospatial Data Infrastructure (CGDI) metadata which is an implementation ofNorth American Profile of ISO-19115. The comparison analyzes the two metadata against three simulated scenarios aboutdiscovering needed 3D geo-spatial datasets. Considering specific metadata about 3D geospatial models, the proposed metadata-sethas six additional classes on geometric dimension, level of detail, geometric modeling, topology, and appearance information. Inaddition classes on data acquisition, preparation, and modeling, and physical availability have been specialized for 3D geospatialmodels

Towards Precise Metadata-set for Discovering 3D Geospatial Models in Geo-portals