[Qgis-user] to query a raster

[ambijat]

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
>
> ----------------------------------------------------
> email: aborruso at tin.it
> website: http://blog.spaziogis.it
> my 2.0 life: http://aborruso.spaziogis.it
> feed: http://feeds2.feedburner.com/Tanto
> 38° 7' 48" N, 13° 21' 9" E
> ----------------------------------------------------
> --
> View this message in context: http://osgeo-org.1803224.n2.nabble.com/to-query-a-raster-tp6299256p6299256.html
> Sent from the qgis-user mailing list archive at Nabble.com.
> _______________________________________________
> Qgis-user mailing list
> Qgis-user at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/qgis-user
>
>