Fig. 4. Comparing land cover within a buffer of 1000 m extending from the Helge å River main flow with the land cover in the whole catchment. Forest cover in buffer underestimates forest cover in the catchment. Data from 2000 is based on classified satellite images (Kontinuerlig Naturtypskartering av Skyddad Natur [KNAS] project, Swedish EPA, unpublished data) and data for 2007 is based on classified satellite images (Landsat) using segment-based image classification in Idrisi Taiga. Map shows catchment, buffer zone, and county borders (difference = percentage land cover in buffer - percentage land cover in whole catchment).

Fig. 4