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. One of the main barriers to the uptake of 3D GI is the lack of understanding of what the user requirements are. From the data acquisition and creation perspective – in particular, that of a National Mapping and Cadastral Agency who may need to prepare datasets with national coverage – this is an issue as each new 3D feature type and element within a feature added (such as doors, windows, chimneys, street lights) requires additional processing and cost to create. This paper reports the results of a user requirements gathering exercise for a national 3D mapping product in the United Kingdom. The study focuses on the user perception of ‘usefulness’ of different 3D geometry and semantic features. A web-based questionnaire with Likert-type items was selected as the primary data collection method and was conducted in May 2017. A total of 121 completed responses were from the UK. Descriptive analysis showed that ‘Air quality engineering’, ‘Infrastructure & transport’ and ‘Environmental services’ presented the most positive outlook on the usefulness of 3D. Correlation analysis showed that potential 3D product groups that could be formed in a multi-product approach. Cluster analysis showed that appetite for 3D information not only varies between sectors, but also within sectors between different practitioners. The results from exploratory factor analysis showed that users were more interested in additional information on non-building features rather than additional detail to building geometry. Further continued work is required to incorporate both non-GIS users and 3D users outside the GIS domain.

USER REQUIREMENTS GATHERING FOR A NATIONAL 3D MAPPING PRODUCT IN THE UNITED KINGDOM