[Qgis-user] Select vectorline automatic

[Neumann, Andreas]

Hi Lene, 

How about using the modulus operator in the QGIS expression? 

With modulus you can select any nth line, 

e.g. assuming that the tool created features where the gid advances by 1
for each feature, you could  

gid % 2 = 0 

selects gid with odd numbers: 0,2,4,6 

or 

gid % 5 = 0 

would select every 5th number: 0,5,10,15,20 

Hope this helps. 

Just replace gid with whatever is your primary key column. 

Andreas 

On 2016-02-19 08:17, Lene Fischer wrote:

> Hi, 
> 
> I´m creating a tutorial about lawnmoving J for calculating lengths ect. 
> 
> I have created a graticule / vector grid with parallel lines. I want to select every second line automatic. Is there a feature for that? 
> 
> LENE FISCHER 
> 
> Associate Professor 
> 
> DEPARTMENT OF GEOSCIENCES AND NATURAL RESOURCE MANAGEMENT 
> 
> University of Copenhagen 
> 
> MOB +45 40115084 
> 
> lfi at ign.ku.dk 
> 
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