<s>
Generic	B-Application
Mapping	I-Application
Tools	I-Application
(	O
GMT	O
)	O
are	O
an	O
open-source	B-Application
collection	O
of	O
computer	O
software	O
tools	O
for	O
processing	O
and	O
displaying	O
xy	O
and	O
xyz	O
datasets	O
,	O
including	O
rasterisation	O
,	O
filtering	O
and	O
other	O
image	B-Algorithm
processing	I-Algorithm
operations	O
,	O
and	O
various	O
kinds	O
of	O
map	B-Application
projections	I-Application
.	O
</s>
<s>
The	O
software	O
stores	O
2-D	O
grids	O
as	O
COARDS-compliant	O
netCDF	B-Application
files	O
and	O
comes	O
with	O
a	O
comprehensive	O
collection	O
of	O
free	O
GIS	B-Application
data	O
,	O
such	O
as	O
coast	O
lines	O
,	O
rivers	O
,	O
political	O
borders	O
and	O
coordinates	O
of	O
other	O
geographic	O
objects	O
.	O
</s>
<s>
Users	O
convert	O
further	O
data	O
(	O
like	O
satellite	O
imagery	O
and	O
digital	B-Application
elevation	I-Application
models	I-Application
)	O
from	O
other	O
sources	O
and	O
import	O
them	O
.	O
</s>
<s>
GMT	O
stores	O
the	O
resulting	O
maps	O
and	O
diagrams	O
in	O
PostScript	B-Language
(	O
PS	B-Language
)	O
or	O
Encapsulated	B-Language
PostScript	I-Language
(	O
EPS	B-Language
)	O
format	O
.	O
</s>
<s>
Users	O
operate	O
the	O
system	O
from	O
the	O
command	B-Application
line	I-Application
:	O
this	O
enables	O
scripting	O
and	O
the	O
automation	O
of	O
routine	O
tasks	O
.	O
</s>
<s>
More	O
or	O
less	O
comprehensive	O
graphic	B-Application
user	I-Application
interfaces	I-Application
are	O
available	O
from	O
third	O
parties	O
,	O
as	O
well	O
as	O
web	B-Application
applications	I-Application
,	O
bringing	O
the	O
system	O
's	O
functionality	O
online	O
.	O
</s>
<s>
Paul	O
Wessel	O
and	O
Walter	O
H	O
.	O
F	O
.	O
Smith	O
created	O
GMT	O
in	O
1988	O
at	O
Lamont	O
–	O
Doherty	O
Earth	O
Observatory	O
,	O
officially	O
releasing	O
it	O
on	O
October	O
7	O
,	O
1991	O
under	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
.	O
</s>
