Re: [Qgis-user] v.generalize in GRASS toolbox stalls out

[Nicolas Cadieux]

700MB... That would make sense.

The all mighty Shapefile will some day, disappear... :(
Nicolas

Le 2016-07-12 14:54, Cene Ketcham [via OSGeo.org] a écrit :
> Ah, good call. I didn't think of that. The original is already ~700MB, 
> so adding several million vertices could push it over 2GB. Trying it 
> as spatialite now; if that doesn't work, I'll throw it in a PostGIS db.
>
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Re: [Qgis-user] v.generalize in GRASS toolbox stalls out

[Cene Ketcham]

Ah, good call. I didn't think of that. The original is already ~700MB, so
adding several million vertices could push it over 2GB. Trying it as
spatialite now; if that doesn't work, I'll throw it in a PostGIS db.



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Re: [Qgis-user] v.generalize in GRASS toolbox stalls out

[Nicolas Cadieux]

Hi,

Could it be that you are hitting the size limit of the shapefile?  I 
have had problems like this trying to make Isoline for a very big raster 
(all of Québec).  The solution could be to split the shapefile or maybe 
to change file formats (spatialite maybe???). Look at the file size as 
it grows.  If this is the problem, you will see it stop growing after a 
while.Sometime, the algorithm does not crash and it just keeps on 
going on.

Nicolas



Le 2016-07-12 12:58, Cene Ketcham [via OSGeo.org] a écrit :
> Hi,
>
> For the past week or so I have been trying to run the Chaiken 
> smoothing algorithm in v.generalize on a large shapefile, but haven't 
> been able to get it to actually complete. The closest I've gotten is 
> 83%. I was wondering if anyone has tips on getting the function to 
> complete or an alternate way to achieve the same result.
>
> Details:
>
> The shapefile in question is a vectorized version of a landcover 
> raster with ~558K features. As a converted raster, it has 
> awful-looking stairstep boundaries between the polygons that I'd like 
> to smooth. This file is for a large (~8'x8') wall map, so the raster-y 
> borders are painfully obvious. Preservation of area is not essential, 
> as the desired output is for display only, but it does need to 
> maintain topological correctness. Therefore, v.generalize seems like a 
> natural solution.
>
> I just have a standard Windows workstation - not super powerful, but 
> no pushover either (Core i5 @ 3.3 GHz, 8 GB RAM, Win 7).
>
> I have tried in both QGIS 2.14.0 and 2.16.0 with the same result: the 
> progress bar stops updating and QGIS stops responding. Any ideas?
>
> Best,
> Cene Ketcham
>
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