Technologies collecting location-based data in the real world have advantagesover traditional methods for landscape perception research. Thepossibility to relate geo-referenced responses of inhabitants to the physicaland social data in expert GIS databases can lead to new insights into thedifference between laymen and expert opinions and may result in adjustmentsof policy forming. To date, the use of Social Sensing in Landscapeperception and valuing is limited. This research presents the set of requirementsfor a mobile application for landscape and urban planning, discussessome of the main challenges, and concludes that a number of evaluatedexisting mobile applications just partly meet those requirements.Landscape ArchitectureAlgorithmicsInteractive IntelligenceSystem Engineerin