| The basic topographic data was acquired from Peter Schlyter of the Department of Physical Geography at Lund University, Lund, Sweden, as MapInfo® (.mif) files. Subsequently, the files were converted to Shapefiles for modification in ArcView® GIS 3.2 (see appendix A). Taking inventory of the topographic vector files involved extensive editing sessions in order to meld the base data into a useable form for the project. Vector vertices had to be adjusted, spliced, and unionized to form cohesive isometric units to be used in the extraction. The refined vector files were then prepared for attribution. Referencing an available hardcopy of the coverage area, the digital topographic lines were assigned respective elevation values piece by piece. |