This thesis provides insight to an object-oriented approach for mapping the current land use and land cover (LULC) in the study area Crans-Montana-Sierre in Valais. The study area is located in an inner alpine dry valley in the canton of Valais in Switzerland. In times of scarcity and global change the significance of water management in the Alps as a component of development increases consistently. The goal of this master thesis is the development and application of a suitable methodology for the establishment of an accurate and detailed LULC map of the study area Crans-Montana-Sierre, which shall serve as an accurate base map for the inter- and transdisciplinary project MontanAqua. This project deals with the development of options for a sustainable water management at a commune level and is within the framework of the National Research Programme Sustainable Water Management (NRP 61).