<div>Line Trace Plus was a very powerful raster to vector conversion program used by the SCS, BLM, and US Forest Service for years. At one point it was distributed along with GRASS, but that no longer seems to be the case. It pretty much dropped out of existence after project 615 made the ESRI suite available to all of these Federal Agencies. </div>
<div> </div>
<div>We used a port of it on 24 Linux kernel 0.9.1 slackware boxes in 1992 to convert a huge amount aerial photo interpretation data to vector polygons as part of the Interior Columbia Ecosystem Management Project (ICBEMP) mid-scale assesment. As far as I know, this was the first large scale use of Linux within the US Forest Service/BLM. I digress though....</div>
<div> </div>
<div>The product continued to be developed by Infotec as a commercial product and I believe David Mandel who once worked for them still has a copy of the public domain source code.</div>
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<div>The GRASS source code and Linux Binaries are available at <a href="http://grass.itc.it/oldprojects/ltplus/">http://grass.itc.it/oldprojects/ltplus/</a></div>
<div>David had a page up at <a href="http://ltplus.org">ltplus.org</a>, but it seems to be dead today.</div>
<div> </div>
<div>Craig</div>
<div><br><br> </div>
<div class="gmail_quote">On Thu, Feb 4, 2010 at 11:40 AM, Landon Blake <span dir="ltr"><<a href="mailto:lblake@ksninc.com">lblake@ksninc.com</a>></span> wrote:<br>
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<p class="MsoNormal"><font size="2" face="Arial"><span style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Is anyone aware of a raster tracing tool for geospatial users released under an open source license? I’m looking for something similar to:</span></font></p>
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<p class="MsoNormal"><font size="2" face="Arial"><span style="FONT-FAMILY: Arial; FONT-SIZE: 10pt"><a href="http://www.vextrasoft.com/vextractor.htm" target="_blank">http://www.vextrasoft.com/vextractor.htm</a></span></font></p>
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<p class="MsoNormal"><font size="2" face="Arial"><span style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">I found the Autotrace program (<a href="http://autotrace.sourceforge.net/" target="_blank">http://autotrace.sourceforge.net/</a>), but it seems to be a little more limited, and not geared to the GIS user. Vextractor allows you to georeference your tracing output and supports export of the traced vectors to SHP and DXF.</span></font></p>
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<p class="MsoNormal"><font size="2" face="Arial"><span style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">The price for a single license of Vextractor isn’t bad ($99 US), but I’d love to find a similar open source project. I’ve thought about trying to write something up using JTS, but I know it would be a very challenging project. I’d like to know if any of you have worked on open source projects in this area.</span></font></p>
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<p class="MsoNormal"><font size="2" face="Arial"><span style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Thanks for any info.</span></font></p>
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<p class="MsoNormal"><font size="2" face="Arial"><span style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Landon</span></font></p>
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<p><font face="Arial"><font size="1"><strong>Warning:<br></strong>Information provided via electronic media is not guaranteed against defects including translation and transmission errors. </font></font><font face="Arial"><font size="1">If the reader is not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this information in error, please notify the sender immediately.</font></font></p>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Craig Miller<br>Geospatial Software Architect<br>