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What raster format should I use to create viewsheds in QGIS using the grass r.los plugin? I am using the Ordnance Survey Opendata DTM (tried both ascii and shapefile formats) and srtm geotiffs but when I run r.los I can't select an input raster - does that mean the raster is the wrong format?

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In case you didn't know, you first have to import the ascii or geotiff into GRASS with r.in.gdal, r.in.xyz, etc. –  Micha Aug 19 '12 at 19:33
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It works here with OS OpenData *.asc rasters. QGIS Master, Ubuntu 12.04 running GRASS r.los from the Sextante toolbox. N.

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