If you are going to use GRASS r.to.vect (for instance through QGIS Processing), you will need a binary skeleton image. You could get one by using the raster calculator to extract your single colour as a binary image, and then GRASS r.thin (available in QGIS Processing) to get the skeleton.
Håvard On 29/7/2015 8:36:AM, Nick Papadonis wrote:
Hi Folks, I have a map with numerous trails in a single color and would like to vectorize these. Is there a mode Qgis can be placed in such that a color can be selected for inclusion in the vectorization process? I.e. to make converting these routes to vector format easier? Thanks again _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
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