Hi,
Try a raster to vector conversion instead. That will give you better results.
Cheers
Envoyé de mon iPad
> Le 15 sept. 2016 à 08:30, KOHLMANN Hannes [via OSGeo.org]
> <[email protected]> a écrit :
>
> Hello Nicolas,
>
>
>
> thank you for your answer! Reinstalling Osgeo removed the error I mentioned.
> Now I was able to get contour lines (!! When I chose „Auto“ for the advanced
> preference v.out.ogr) with r.contour.step, where I chose the minimum 0 and
> maximum 10 with step size 1. After getting the contour vector layer, I
> transformed it with the tool Vector à Geometry tools à from line to polygon
> which gives me areas, that I gave 5 different colors then.
>
> Snapshots of the density raster file and the result (filled contours) are
> here:
>
> Density: https://postimg.org/image/86yowo0oj/
>
> Filled Contours: https://postimg.org/image/ugk8s349n/
>
>
>
> I’m not really satisfied with that result because:
>
> 1) Why is it, that there are white areas where actually there should be
> other than blank? Is it because the contour lines are not closed for these
> areas? I strongly think so - what would be recommended to avoid that ?
>
> 2) When I select „area“ under the advanced preferences in
> r.contour.step, I get NOTHING … not a single value or color… do I have to
> configure the parameters of r.contour.step/level differently?
>
>
>
> If you are interested in trying to reproduce that, here is the corresponding
> density .dat raster file. I gave it the style of 5 different colors,
> equidistantly distributed.
>
> https://www.dropbox.com/s/bpkfkvos6ss3wx5/density_2015.dat?dl=0
>
>
>
> Thank you very much for your help, it took me already one step closer tot he
> truth :D
>
>
>
> Best regards,
>
> Hannes
>
>
>
> Von: Qgis-user [[hidden email]] Im Auftrag von Nicolas Cadieux
> Gesendet: Donnerstag, 8. September 2016 19:57
> An: [hidden email]
> Betreff: Re: [Qgis-user] QGIS - help: filled contour lines from raster layer
> data
>
>
>
> Hi,
>
>
>
> I am not sure why you get that error but the r.contour.level will give you
> what you need if you select "area" in the v.out.org parameter. That will
> give you polygons that you can color the fill area. If you have installed the
> latest version of Qgis, your processing toolbox could be a mix of old and new
> tools. If this is the case, I would do complete reinstall deleting all the
> old plugins.
>
>
>
> Nicolas
>
>
> Envoyé de mon iPad
>
>
> Le 8 sept. 2016 à 08:47, KOHLMANN Hannes [via OSGeo.org] <[hidden email]> a
> écrit :
>
> Hello dear QGis users!
>
>
>
> A collegue and me were wondering if it is possible to create contour lines,
> or more important for us, FILLED contour lines (areas) for RASTER LAYER data!
>
> We are both very positive that this once worked and we have done that. Now we
> cannot find the way to reproduce that anymore.
>
> On the one hand, we thought that we had done it with the gdal-Contour tool in
> QGIS (Raster->Extract->Contour), but now we can’t find an option to generate
> filled contour areas, like
>
> it is possible with the installable extension „Contour Plugin“ (which is only
> possible to use with a point vector layer, but this is exactly what we think
> that we have done to a raster layer file!).
>
> 1. Now the question: was that ever possible to do with the gdal-contour
> plugin? Or not…
>
>
>
> 2. On the other hand, we also tried to use the GRASS Gis algorithms
> r.contour.level or r.contour.step, etc in the processing toolbox, but they
> keep giving us the error message: „environment can only contain strings See
> log for more details“. What ist he problem here? Does it have to do with the
> new version Grass Gis 7?
>
>
>
> 3. Bottom line is: We have got a .dat file, which is a raster layer with
> valued pixels that we are displaying in spectral colors. Now we want to
> extract the contour lines and to have a color fill between those contour
> lines. How would you do this – is there an easy solution, which differs from
> the numerous tutorials on the web, which seem to be a lot more complicated
> than what we actually remember to have done?
>
>
>
> Thank you very much in advance, any answer would be very helpful!
>
>
>
> Best regards,
>
> Hannes Kohlmann
>
>
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