ECHO indexes several collections from the ASTER instrument aboard the Terra satellite. These collections are provided by LPDAAC. For more specific ASTER information, check out the links in the right hand column.
Ordering GDEM data requires a URS profile, once you have an active URS profile, log into Reverb via this link. If you have a problem logging in, checkout this section of the Reverb Tutorial or contact ECHO User Support.
In general you will be interested in a specific geographic region, select that region using the map on the front page. For more information about using the spatial search options, see this link.
Check the box next to the ASTER Global Digital Elevation Model V002 dataset
Click the Search for Granules button at the bottom of the page.
The GDEM has over 22K granules, currently Reverb only allows 2000 granules per order. If you are interested in getting all 22K granules from the ASTER GDEM collection (which is 300+GB's of data), this usually requires sending a sealed external hard drive to LPDAAC and filling out a series of forms to document your request. Please contact LPDAAC user services directly for this.