| Source | Format | Resolution | Location | Archive |
|---|---|---|---|---|
| NOAA Globe Data | Arc/Info GRID | 1km | Global | CD Jukebox Archive |
| USGS GTOPO 30 | Arc/Info GRID | 30 sec | Global | CD Jukebox Archive |
| USGS ETOPO 5 | Arc/Info GRID | 5 min | Global | Hydrology Group Archive |
| USGS GTOPO 30 | ERDAS LAN | 1km | South America | GIS Lab Archive |