Circumpolar Arctic Coastline and Treeline Boundary

Coastline and Treeline Boundary Map

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The coastline for the CAVM came from the Digital Chart of the World (DCW; ESRI 1993). The DCW coastline was at a much finer scale than needed for the CAVM project. The coastline was simplified by deleting all the attributes from the DCW and deleting all islands smaller than 49 km² using the ARC/INFO ELIMINATE command. The coastline was further simplified by removing any arc verticies that were closer together than 5000m (Arc generalize command, 5000 m weed tolerance, bendsimplify option), and combining any two lines closer than 500m (Arc fuzzy tolerance = 500m). After the initial simplification of the coastline data all subsequent processing of the vegetation data were performed using a 200m fuzzy tolerance.


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