[GRASS-user] Re: QGIS GRASS plugin shadedrelief issue

Micha Silver micha at arava.co.il
Mon Sep 20 09:43:20 EDT 2010


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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