nunosousa84 wrote:
Good question Micha. Well i remember i checked the vector lines after
completing them (things like not crossing, not touching and confirming that
all of the lines has attributes to them, in this case altitude values). Then
i checked overlapping raster contours in relation to the vector lines to see
if there was any deviance from the original vector lines. I cant find any
problem with this. mmm... what could it be? Somekind of overlapping cells?
The way you can check is with v.clean. It has an option to break line
vector at all line crossings and create a point vector of the crossings:
v.clean <your contour line vector> out=contour_clean tool=break
err=crossings
If the resulting crossings vector has any points, compare them with the
"black spots".
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