The author addresses this: > There already exist tools to automatically convert raster (bitmap) images to vector formats, including Adobe Illustrator’s Live Tr

The author addresses this: > There already exist tools to automatically convert raster (bitmap) images to vector formats, including Adobe Illustrator’s Live Trace/Image Trace tools or standalone programs like Peter Selinger’s potrace, which provides the comparable functionality in Inkscape. > However, all of these tools share a common shortcoming from the perspective of mapmaking – given a simple raster line drawing(…) they actually produce two contours, one for the inside, and one for the outside.