1.2 Causes of Digitizing Errors
The second scenario consists of errors in
scanning and tracing. A tracing algorithm usually
has problems when raster lines meet or
intersect, are too close together, are too wide,
or are too thin and broken (Chapter 5). Digitizing
errors from tracing include collapsed lines,
misshapen lines, and extra lines (Figure 7.1).
Duplicate lines can also occur in tracing because
semiautomatic tracing follows continuous lines
even if some of the lines have already been
traced.