The science teams at the NASA Jet Propulsion Lab (JPL) and Japan’s Ministry of Economy, Trade, and Industry (METI) used the ASTER sensor onboard the Terra satellite to produce 30 m resolution elevation data. These data cover 99% of the land surface from 83° north latitude to 83° south latitude. Version 2 of these data was released in October 2011 and is a significant improvement over the initial data release. You can view the latest information about these data at the USGS LP DAAC
These ASTER data are now available at the USGS Earth Explorer site. You may zoom in, create polygon features, or enter path/row information to select your area of interest. Then select Digital Elevation, then ASTER GLOBAL DEM, and click Results.
These data may be packaged in many tiles. You can turn on or off individual tile footprints and immediately download each tile. If there are many tiles you can select them for Bulk Download, which will add the results to your “shopping cart.” You will receive an email when the data are available for retrieval and you then use the USGS Bulk Download Application (installed on the YCEO Lab computers) to easily retrieve your data.