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] 
> <ml-node+s1560n5286093...@n6.nabble.com> 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
> 
> 
> _______________________________________________ 
> Qgis-user mailing list 
> [hidden email] 
> List info: http://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user
> 
> If you reply to this email, your message will be added to the discussion 
> below:
> 
> http://osgeo-org.1560.x6.nabble.com/QGIS-help-filled-contour-lines-from-raster-layer-data-tp5284720.html
> 
> To start a new topic under Quantum GIS - User, email [hidden email] 
> To unsubscribe from Quantum GIS - User, click here.
> NAML
> 
>  
> 
> View this message in context: Re: QGIS - help: filled contour lines from 
> raster layer data
> Sent from the Quantum GIS - User mailing list archive at Nabble.com.
> 
> 
> _______________________________________________ 
> Qgis-user mailing list 
> [hidden email] 
> List info: http://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user 
> 
> If you reply to this email, your message will be added to the discussion 
> below:
> http://osgeo-org.1560.x6.nabble.com/Re-QGIS-help-filled-contour-lines-from-raster-layer-data-tp5286093.html
> To start a new topic under Quantum GIS - User, email 
> ml-node+s1560n4125267...@n6.nabble.com 
> To unsubscribe from Quantum GIS - User, click here.
> NAML




--
View this message in context: 
http://osgeo-org.1560.x6.nabble.com/Re-QGIS-help-filled-contour-lines-from-raster-layer-data-tp5286093p5286106.html
Sent from the Quantum GIS - User mailing list archive at Nabble.com.
_______________________________________________
Qgis-user mailing list
Qgis-user@lists.osgeo.org
List info: http://lists.osgeo.org/mailman/listinfo/qgis-user
Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user

Reply via email to