Dear all, I'm running under an XY location (uprojected). Could be this the problem? We are using a local zero not linked to any reference system. Here the output:
g.proj -w XY location (unprojected) g.region -p projection: 0 (x,y) zone: 0 north: 1 south: 0 west: 0 east: 1 nsres: 0.0001 ewres: 0.0001 rows: 10000 cols: 10000 cells: 100000000 This is the output of v.clean v.clean input=rill_800_parcellaB_polyline@pierluigi output=rill_800_parcellaB_prune tool=prune threshold=0.1 -------------------------------------------------- Tool: Threshold Prune: 0.1 -------------------------------------------------- ... -------------------------------------------------- Tool: Prune lines/boundaries 0 vertices from input 11742 (vertices of given type) removed, i.e. 0.00 % -------------------------------------------------- Thanks Pierluigi ----- Messaggio originale ----- Da: "Markus Neteler" <[email protected]> A: "Pierluigi De Rosa" <[email protected]> Cc: "GRASS user list" <[email protected]> Inviato: Lunedì, 6 aprile 2015 21:28:14 Oggetto: Re: [GRASS-user] v.clean error threshold under 2 meters Hi Pierluigi, On Thu, Apr 2, 2015 at 11:34 AM, Pierluigi De Rosa <[email protected]> wrote: > Dear all, > > I have a unusual system unit. Please tell us which :-) > I'm working on a parcel unit for rill > analysis. I'm able to extract the network and I would prune a bit the > resulting output. > All the parcel I'm studying is 10 meters wide and 22 meters long, the mean > average distance between the streams is about 1-2 centimetres. I need to > remove nodes in a threshold of 0.005 meters (half centimetre) but I'm having > problem assigning such threshold to v.clean > I'm running GRASS7. > If I use these thresholds ( 0.005, 0.01,1,) no points are removed. > The first valid working threshold is 2 meters. > > Maybe v.clean does not accept value under 1 meter or I'm doing something > wrong? v.clean should accept "any" value (and we have used GRASS GIS with microscope data in the nanometer scale). Could you post the output of g.region -p g.proj -w ? best Markus
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