The WeSense pilot trialled in the Greater Amsterdam region, demonstrates that Social Sensing using mobile electronic devices is effective in the collection of real-time, location-specific data from citizens and visitors on perceptions and responses to a wide variety of environments in metropolitan areas. This form of data generation also allows for the inclusion of a range of critical parameters affecting perception, such as: time of the day, day of the week, season, weather, activity, company, and state of mind. Additional incorporation of sensorial aspects such as visual, auditory, and olfactory sensations in the WeSense pilot shows promise, but needs to be better incorporated. The WeSense platform shows that use of social sensing using mobile technology supplements traditional environmental research methods by facilitating situated responses. Users contribute data on how they experience an outdoors space while they are situated in that space (situated data creation) which reproduces their immediate impressions with the surroundings. The most immediate ‘proofing’ of this advantage is the generation of photos by different users.@en