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

[Moritz Lennert]

On 18/09/17 11:14, Moritz Lennert wrote:
> 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.
> 


P.S. https://trac.osgeo.org/grass/ticket/3102

Moritz