Can I use the Spatial Data Transfer Standard (SDTS) formatted DEMs in ArcView?
Currently, ArcView Spatial Analyst does not directly support the SDTS formatted DEMs. There are utilities available to convert the SDTS formatted DEM to the standard USGS DEM, a generic ASCII raster file, or an x,y,z point file. After converting the SDTS DEM, you can import either the standard USGS DEM or generic ASCII file into ArcView Spatial Analyst to create a GRID data source.