###### Abstract
[35] investigated the roof-wall transition geometry by testing different variations of a spherical roof using CFD and showed that a soft transition (curved edge) between the wall and the roof leads to a desired speed-up. [PERSON] and [PERSON] [11] carried out CFD tests investigating the wind flow over three configurations of two tall buildings by considering parameters such as building height, type of roof (flat and cater-corner flat roof) and distance using meteorological data. [PERSON] et al. [36] characterised the flow field in the rooftop area of two buildings using CFD and assessed general criteria as the height and the width of its upwind building and the distance between the buildings themselves, to evaluate the convenience of a microeolic turbine installation on the roof. In contrast, there are very few wind tunnel tests focusing specifically on wind velocity measurements of the flow above the roof of high-rise buildings. An example of a well-documented wind tunnel database was published by the Architectural Institute of Japan (AIJ) [37]. The database aims to provide benchmark validation test cases to validate CFD studies and, eventually, it was used to set best practice guidelines for the prediction and the assessment of the pedestrian wind environment around buildings [38]. Along with low-rise test cases, the AIJ also reports on high-rise buildings. Another similar database is the CEDVAL database [39], which was designed to validate numerical dispersion models. CEDVAL provides flow measurements of cubic and prismatic building shapes either isolated or in a regular array. Both AIJ and CEDVAL datasets have in common the fact that they mostly report pedestrian level winds. Although some measurement points above the roof are provided, they are limited in scope and extension. Therefore, the flow above the roof of high-rise buildings remains a rather unexplored topic of building aerodynamics. Moreover, the effect of the wind direction is also largely disregarded in investigations. Incidentally, CFD studies in the literature do present some sort of validation using experimental data, however more appropriate test cases are needed, including measurements of the velocity field at more specific locations above the roof [35; 40]. This study aims to provide an adequate database with test cases specifically targeting the wind energy potential over high-rise buildings. An experimental campaign was performed at the \"Building Aerodynamics Laboratory\" of Ruhr University Bochum (WIST). Within this campaign, the presented study is contributing to the identification of the flow pattern above an isolated high-rise building with a height-to-width ratio of 3:1 under different incident wind directions. Besides considering a flat roof benchmark case, the study also treats a deck roof case, presumably more favourable for improving wind energy harvesting. The present dataset is available at Mendeley Data [41]. The flow above the same high-rise building model was also analysed in [42] with reference to building clusters, and that dataset is also available at Mendeley Data [43]. Both experimental studies were part of the activities of the EU COST Action TU1304 [44; 45]. In addition,the presented work brings more insight into the flow-specific characteristics, particularly important for urban wind exploitation. It also provides a comparison to the flow pattern observed above flat-roof low-rise buildings, in terms of flow structures and augmented wind speed.