[Qgis-user] How to convert raster routes into vector format?
Nick Papadonis
npapadonis at gmail.com
Wed Jul 29 07:40:38 PDT 2015
Hi Håvard,
I found the raster calculator and read the online manual for it, however am still a bit lost. I was also playing with the Style properties and color bands last night to try to accomplish this. I was unable to get a single binary image with the single color (red in this case). I think the understand the r.thin suggestion and that it will thin the single color thick lines for vectorization. Appreciate if you can expand on obtaining a binary skeleton of the one color of the trails.
Thanks again,
Nick
> On Jul 29, 2015, at 7:18 AM, Havard Tveite <havard.tveite at nmbu.no> wrote:
>
> 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
>> Qgis-user at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/qgis-user
>>
More information about the Qgis-user
mailing list