[GRASS-user] nan values by v.generalize

[Moritz Lennert]

On 14/12/07 14:48, Andre Hauptfleisch wrote:
> Good day guys,
> 
> I came across a problem in the v.generalize module. I do the following:
> v.generalize input=myvect at test output=myvect_smooth type=line 
> method=hermite threshold=10
> 
> I then do a v.out.svg and noticed the following line in the svg file:
> <path gg:cat="31" d="M 111.500000 -80.500000 l 8.734748 4.771559 
> 9.907176 6.337565 nan nan nan nan nan nan nan nan nan nan" />
> 
> Any idea how I can get rid of those nan's? They cause stuff such as 
> v.to.rast to hang.

I cannot reproduce this with the speafish60 dataset:

v.out.svg input=roads at PERMANENT output=roads type=line precision=6 layer=1

and

v.generalize input=roads at PERMANENT output=roads_smooth type=line 
method=hermite threshold=10 look_ahead=7 reduction=50 slide=0.5 
angle_thresh=3 degree_thresh=0 closeness_thresh=0 betweeness_thresh=0 
alpha=1.0 beta=1.0 iterations=1 layer=1

v.out.svg input=roads_smooth at user1 output=roads_smooth type=line 
precision=6 layer=1

Both give me svg files without nan's.

Can you reproduce this with spearfish data ? Can you look at the line 
with cat=31 in your grass vector (maybe in v.digit) and see if there is 
anything abnormal about it ?

Moritz