The ASTER14DMO format file contains 15 TIF files. These include 14 bands of imagery (V1-3n and 3b, S4-S9, T10-T14), and a DEM file. If you have an HDF file see this posting first. DEM 1. Open the TIF file and right-click layer > Data… > Export Data… choose Format: GRID 2. Give it a legal filename for GRIDs (short filename, no spaces or weird characters) 3. Use the Setnull command in Raster Calculator to change all values less that 0 to null Spatial Analyst menu > Raster Calculator SETNULL ( [GRIDNAME] < 0 , [GRIDNAME] ) 4. Make the result permanent. This is your 30m dem. If you want to combine several of these DEMs into a single surface use MOSAIC or MERGE from the Raster Calculator (see Help files about these commands). The FOCALMEAN might allow you to fill small voids from clouds, or combine several images to fill holes. Beware of elevation changes between scenes. Imagery – Visual Bands (15m resolution) 1. From the same folder load TIF files containing bands V1, V2, and V3N. 2. Use the Arctoolbox: Data Management Tools > Raster > Composite Bands… 3. Choose the three bands 4. Export to a .TIF file (type the .TIF suffix at the end of the filename to specify TIF output). 5. Load the TIF file and in Symbology reverse the Band display so that Red = Band_3, Green = Band_2 and Blue = Band_1. Also check the box next to “Display Background Value: (R,G,B)” in symbology. You’re done!