[GRASS-user] Merge lines into common categories based an attribute information

[Moritz Lennert]

On 17/09/17 18:48, Johannes Radinger wrote:
> Thank you Moritz!
> 
> Of course, v.reclass does the job. I just didn't see the column option...
> 
> Regarding the second (additional) part of this question: It seems that 
> v.to.db works well to report line lengths on a category-base. However, 
> sinuosity seems to be calculated based on features (i.e. feature ids). 
> Thus, I only get reasonable results if a cat only consists of one 
> feature. For connected lines that consist of more than one feature 
> (lines) the sinuosity index is not correct. So, I probably need to loop 
> over the cats, extract the lines that belong to one cat and build a 
> polyline before calculating sinuosity.


Please file a bug report on this so that someone might at least have a 
look at it. ISTR, that this kind of limitation was present for other 
indicators in v.to.db and is definitely worth thinking about.

Moritz