[Qgis-user] image vectorization

[nikos]

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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