Does anyoe have a link to or know of a list of raster formats the above tool can work with? I'm on QGIS 2.8 using the latest version of the plugin.
I've tried a couple of different raster types and but have so far only had success on an .adf (ESRI grid) raster.
Best Answer
See my working example here: Performing viewshed analysis with Dutch AHN files in QGIS?.
It works for me with SRTM files the same way.