Especially in small-scale landscapes, common in Northwest Europe, transitions between surface types have significant influence on the surface-atmosphere exchange. In order to investigate the behaviour of turbulent flux densities under heterogeneous surface conditions the SLIMM (Surface Layer Integration Measurements and Modelling) experiment was set up in the North of the Netherlands. The study area of about 5 square kilometres consisted of three distinguishable subareas, namely a peat bog, forest and agricultural area. From January through November 1995 simultaneous measurements, using profile and eddy correlation methods, were performed in all subareas, the VUA thereby covering the agricultural subarea. In addition, remote sensing measurements of the boundary layer were taken at the agricultural subarea, using SODAR and 3D-RADAR/RASS equipment. In the study of the transition from the forest to the agricultural terrain, eddy correlation equipment was installed at 4, 13 and 32 m in order to determine vertical flux divergence. By binning the dataset according to 8 wind direction sectors, each 15 degrees wide, the influence of upwind obstacle type and distance could also be investigated. An increase of the momentum flux with height by up to a factor two was found whereas the scalar fluxes remained constant. The vertical momentum flux divergence declined with increasing fetch, which ranged from 300 to 1100 m. Surface roughness conditions at the observation field, as calculated from the wind speed profile below 2 m, did not depend on wind direction.