Probably I miss the right tool but I can't find the way to split a line layers with another line layer, split on intersection points, which in a spatial db (postgis/splite) can be easily done with st_split.
giovanni -- Giovanni Allegri http://about.me/giovanniallegri Twitter: https://twitter.com/_giohappy_ blog: http://blog.spaziogis.it GEO+ geomatica in Italia http://bit.ly/GEOplus
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