<s>
uDig	B-Language
is	O
a	O
GIS	B-Application
software	I-Application
program	O
produced	O
by	O
a	O
community	O
led	O
by	O
Canadian-based	O
consulting	O
company	O
Refractions	O
Research	O
.	O
</s>
<s>
uDig	B-Language
is	O
based	O
on	O
the	O
Eclipse	B-Application
platform	I-Application
and	O
features	O
full	O
layered	O
Open	O
Source	O
GIS	B-Application
.	O
</s>
<s>
It	O
is	O
written	O
in	O
Java	B-Language
and	O
released	O
under	O
EPL	B-License
and	O
BSD	B-Operating_System
licences	O
(	O
formerly	O
under	O
GNU	B-Application
LGPL	I-Application
)	O
.	O
</s>
<s>
The	O
Software	O
has	O
a	O
walkthrough	O
in	O
Flash	B-Operating_System
and	O
also	O
quick	O
start	O
directions	O
for	O
those	O
who	O
wish	O
to	O
complete	O
a	O
full	O
version	O
build	O
to	O
write	O
plug-ins	O
or	O
contribute	O
to	O
the	O
main	O
build	O
.	O
</s>
<s>
uDig	B-Language
can	O
use	O
GRASS	B-Application
for	O
complex	O
vector	O
operations	O
and	O
also	O
embeds	O
JGRASS	O
and	O
specialized	O
hydrology	O
tools	O
from	O
the	O
Horton	O
Machine	O
.	O
</s>
<s>
It	O
supports	O
shapefiles	O
,	O
PostGIS	B-Application
,	O
WMS	B-Application
,	O
and	O
many	O
other	O
data	O
sources	O
natively	O
.	O
</s>
<s>
uDig	B-Language
is	O
commonly	O
used	O
as	O
a	O
framework	O
for	O
building	O
other	O
GIS	B-Application
platforms	O
and	O
applications	O
.	O
</s>
<s>
Such	O
applications	O
include	O
DIVA-GIS	B-Application
and	O
DEWS	O
–	O
Distant	O
Early	O
Warning	O
System	O
for	O
tsunamis	O
.	O
</s>
