Hello — I am trying to load a DEM from here: http://www.tnris.org/datadownload/quad.jsp?Quad=Sabine%20Pass ("30m DEM" link : ftp://ftp2.tnris.org/Elevation/DEMs/30m/2993/g299317.zip) It is supposedly from USGS but I get error saying that it is not a supported raster source. What is the problem? Can someone help me? Mikhail.