[Qgis-user] image vectorization

[Brad Nesom]

"and then go for vectorization."  I have attempted the gdal polygonize (I
really want lines) and the contour with no good results. Is r.thin the
correct (or even an acceptable) direction to go for vectorization? If using
classification in qgis what is created? another image to use for
vectorization? If not then wouldn't the vectorization need to be done
directly in qgis?
Thanks

On Sat, Nov 13, 2010 at 4:19 PM, nikos <vesnikos at gmail.com> wrote:

> On Sat, 2010-11-13 at 20:05 +0000, ambrish dhaka wrote:
> > Hi All,
> > I have tried to process a LANDSAT TM image for finer identification of
> > features. The area represent the lower Ferghana valley region.
> > See image attached.
>
> The image is not attached. Consider hosting a thumbnail to an external
> server and sent the link if its relevant.
>
> > The difficulty is how to proceed further.
>
> I don't remember if Landsat TM products are already classified. If the
> image is NOT classified you need to run any of the classification
> methods to identify the features you looking for and then go for
> vectorization.
>
> > I cannot create vector lines for the following reasons. r.thin does
> > not produce neatly, vectorization produces intense line with poor
> > feature demarcation. Can some efficient steps be suggested.
> > I shall be grateful.
> > Regards,
> > Ambrish
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>
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