Format: 

GTOPO30DEM 

Projection: 

Geographic 

Datum: 

None 

Ellipsoid: 

WGS84 

Description: 

Grid spacing of 30-arc seconds, approximately 1 pixel for each kilometer. 

Available Data: 

Whole world altitude information, 279 MB in one zipped file. 

Format: 

DTED0 

Projection: 

Geographic 

Datum: 

None 

Ellipsoid: 

WGS 

Description: 

Grid spacing of 30-arc seconds, approximately 1 pixel for each kilometer. 

Available Data: 

Whole world altitude information, 210 MB in one zipped file.