The quadrat locations were measured with a geodetic differ-ential GPS receiver at 2–4 cm accuracy. For each quadrat centre acircular 1 m buffer was generated to summarise the terrain char-acteristics, based on the DSM and its derivatives, in the directneighbourhood of the quadrat. These buffers were used to accountfor the topographic variation and sub-surface water availability inthe direct vicinity of the 25 cm by 25 cm quadrats. Zonal statisticswere then used to calculate the average contributing area for eachquadrat, so that the relative water availability based on the DSMcould be related to the moss health and water content measure-ments in the field.