Απάντ.: [Qgis-user] to query a raster

[vesnikos@gmail.com]

You can create  symbology classes with the desired values you need. 


----- Reply message -----
Από: "ambijat" <ambijat at hotmail.com>
Ημ/νία: Σαβ, Απρ 23, 2011 20:57
Θέμα: [Qgis-user] to query a raster
Προς: "qgis-user" <qgis-user at lists.osgeo.org>

Hi! Andrea,
you can use mapcalc available in grass plugin in qgis.
you can create a blank raster and then load the two rasters in mapcalc.
and then put the if condition for eg.
if((A > 150), B == A, null())

it would copy values greater than 150 from raster A to raster B.
I hope I got it right for you.
cheers,
Ambrish Dhaka

On 4/23/2011 3:31 PM, iomeneandrei wrote:
> Dear all,
> I would like to highlight all the pixels of a DEM with a value exceeding a
> specific height value. Something like "SELECT * FROM dem WHERE zvalue>
> 150".
>
> Is there a way to do this in QGIS?
> Is grass plugin the only tool I can use inside QGIS to make this kind of
> query?
> Is there a way to have only something that highlights the pixels and do not
> produce a new layer?
>
> Thank you,
>
> Andrea
>
> -----
> Andrea Borruso
>
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