Landon Blake wrote: > Thank you for all of the responses. I will summarize here for everyone's > benefit: > > - Line Trace Plugs was a raster to vector conversion program used by the SCS, > BLM and Forest Service. It was historically distributed with GRASS. It may > now be available at ltplus.org. > Site appears to have been down for several years, but you can see the last known revision thanks to the Internet Archive http://web.archive.org/web/20070528050330/http://www.ltplus.org/
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