<s>
GeoModeller	B-Application
(	O
old	O
names	O
include	O
3DWEG	O
,	O
Geomodeller3D	B-Application
)	O
is	O
a	O
methodology	O
and	O
associated	O
software	O
tool	O
for	O
3D	O
geologic	O
modelling	O
developed	O
by	O
Bureau	O
de	O
Recherches	O
Géologiques	O
et	O
Minières	O
and	O
Intrepid	O
Geophysics	O
over	O
the	O
last	O
20	O
years	O
.	O
</s>
<s>
The	O
software	O
is	O
written	O
using	O
Open	B-Language
CASCADE	I-Language
in	O
C++	B-Language
for	O
the	O
engine	O
(	O
geometry	O
,	O
topology	O
,	O
viewers	O
,	O
data	O
management	O
,	O
...	O
)	O
,	O
Java	B-Language
for	O
the	O
GUI	B-Application
and	O
data	O
are	O
stored	O
in	O
extensible	O
mark-up	O
language	O
XML	B-Protocol
.	O
</s>
<s>
GeoModeller	B-Application
has	O
started	O
to	O
revolutionise	O
the	O
working	O
practices	O
,	O
data	O
standards	O
and	O
products	O
of	O
a	O
geological	O
survey	O
as	O
a	O
whole	O
.	O
</s>
<s>
GeoModeller	B-Application
utilizes	O
a	O
Digital	O
Terrain	O
Model	O
,	O
surface	O
geological	O
linework	O
,	O
cross-sections	O
,	O
geophysical	O
interpretation	O
and	O
drillhole	O
borehole	O
data	O
to	O
enable	O
the	O
geologist	O
to	O
construct	O
cross	O
sections	O
,	O
or	O
3D	O
models	O
.	O
</s>
<s>
This	O
inversion	O
formulation	O
allows	O
separate	O
inversion	O
of	O
either	O
gravity	O
or	O
magnetic	O
data	O
or	O
simultaneous	O
inversion	O
of	O
both	O
datasets	O
and	O
tensor	B-Device
components	O
of	O
gravity	O
and	O
magnetic	O
field	O
.	O
</s>
