<s>
GTOPO30	B-Application
is	O
a	O
digital	B-Application
elevation	I-Application
model	I-Application
for	O
the	O
world	O
,	O
developed	O
by	O
United	O
States	O
Geological	O
Survey	O
(	O
USGS	O
)	O
.	O
</s>
<s>
This	O
map	O
is	O
derived	O
from	O
GTOPO30	B-Application
data	O
that	O
describes	O
the	O
elevation	O
of	O
Earth	O
's	O
terrain	O
at	O
intervals	O
of	O
30	O
arcseconds	O
(	O
approximately	O
1km	O
)	O
.	O
</s>
