[pgrouting-users] Data prep questions

[Stephen Woodbridge]

Charles Galpin wrote:
> Hi All
> 
> I am trying to use pgrouting with navteq streets data (NJ, USA) imported from shape files. I am not getting good results and believe it might be due to the way the data is setup.
> 
> Do the start and end points of the geometry need to be oriented the same way? For example if you had 3 sequential segments A,B,C does it have to  look like this
> 
> x1,y1 ---- A ---- x2,y2 == x1,y1 ---- B ---- x2,y2 == x1,y1 ---- C ---- x2,y2
> 
> Or could it be something like this and still work properly for example?
> 
> x1,y1 ---- A ---- x2,y2 ==  x2,y2 ---- B ----  x1,y1 == x1,y1 ---- C ---- x2,y2
> 
> The reason I ask is because the navteq segments can be this second case because of the way the data is structured and I need to know if I should try and rectify this.

pgRouting does not care about this and works fine with either setup.

Maybe you should describe what you are doing and what the results and 
issues are.

Which of the routing methods are you using?
what are the results that you think are wrong?

pgRouting has some peculiar behaviors that can be explained an worked 
around if we know more about what you are actually doing.

-Steve