Fig. 3From: Analysing the quality of Swiss National Forest Inventory measurements of woody species richnessDQR results of the NFI3 and NFI4 repeat surveys for woody species (WoodySp), forest edge species (FoEdge) and upper storey species (UpStorey). Crosses depict data quality limits (DQL) and circles refer to the data quality results (DQR), i.e. the observed mean results comparing regular and repeat surveys with their 95% confidence intervals (Wilson)Back to article page