I'm studying better the topological scheme assumed by GRASS, which if I'm not wrong is G1.<div>I'm doing some basic tests to understand the side effects of working with not topologically clean entities, like self-intersecting lines.</div>
<div><br></div><div>Original line: <a href="http://bit.ly/vfIJiM">http://bit.ly/vfIJiM</a></div><div>Cleaned up line: <a href="http://bit.ly/uHKpoT">http://bit.ly/uHKpoT</a></div><div><br></div><div>The unclean line is topologically incorect, right?</div>
<div>Where the not topological version can give us problems, (excluding the <a href="http://v.net">v.net</a> modules)?</div><div><br></div><div>The question raises from the need to understand if I can bypass line cleaning for various data processing I'm going to do, mainly overlay, data extraction, profile analysis, etc.</div>
<div><br></div><div>Thanks,</div><div>giovanni </div><div><br></div>