[Qgis-user] displaying raster data

[Nicolas Cadieux]

Hi,
This is simple... and then not so simple... There are no raster 
attribute table in QGIS.  I imagine you mean a raster where, for example 
1 = farm land, 2 = city.... This is not implemented :( (I think it is in 
Grass).

The best way to get the unique values of a raster is to use the Grass 
r.report in the processing toolbox (you can play with r.stat also).  I 
think your raster needs to be in integer for this to work.  If it's not, 
you will get intervals I think.  For this select 
"raster/conversion/translate". Click on the yellow pencil and then use 
"-ot Int16" switch.  More info is you click on the help.

http://www.gdal.org/gdal_translate.html
http://grass.osgeo.org/grass70/manuals/r.report.html
http://grass.osgeo.org/grass71/manuals/r.stats.html

Hope this helps.

Nicolas


Le 2015-05-05 12:22, Tsering W Shawa (shawatw at Princeton.EDU) [via 
OSGeo.org] a écrit :
> I use ArcGIS on regular basis. However, I am planning to use QGIS to 
> teach GIS analysis to a NGO group. Somehow I can not find an option to 
> view a raster attribute table in QGIS. Is there a way to view a raster 
> attribute table in QGIS? Also, is there way to displaying raster 
> unique values? I also could not find an option to control a display of 
> continuous value using singleband pseudocolor. Is there a way to 
> control class interval?
>
> Any help will be appreciated.
>
> -Wangyal
>
>
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