<s>
A	O
spatiotemporal	B-General_Concept
database	I-General_Concept
is	O
a	O
database	O
that	O
manages	O
both	O
space	O
and	O
time	O
information	O
.	O
</s>
<s>
Spatiotemporal	B-General_Concept
databases	I-General_Concept
are	O
an	O
extension	O
of	O
spatial	B-Algorithm
databases	I-Algorithm
and	O
temporal	O
databases	O
.	O
</s>
<s>
A	O
spatiotemporal	B-General_Concept
database	I-General_Concept
embodies	O
spatial	O
,	O
temporal	O
,	O
and	O
spatiotemporal	B-General_Concept
database	I-General_Concept
concepts	O
,	O
and	O
captures	O
spatial	O
and	O
temporal	O
aspects	O
of	O
data	O
and	O
deals	O
with	O
:	O
</s>
<s>
location	O
of	O
objects	O
moving	O
over	O
invariant	O
geometry	O
(	O
known	O
variously	O
as	O
moving	B-General_Concept
objects	I-General_Concept
databases	I-General_Concept
or	O
real-time	O
locating	O
systems	O
)	O
.	O
</s>
<s>
Although	O
there	O
exist	O
numerous	O
relational	B-Application
databases	I-Application
with	O
spatial	O
extensions	O
,	O
spatiotemporal	B-General_Concept
databases	I-General_Concept
are	O
not	O
based	O
on	O
the	O
relational	B-Architecture
model	I-Architecture
for	O
practical	O
reasons	O
,	O
chiefly	O
among	O
them	O
that	O
the	O
data	O
is	O
multi-dimensional	O
,	O
capturing	O
complex	O
structures	O
and	O
behaviours	O
.	O
</s>
<s>
There	O
are	O
some	O
products	O
such	O
as	O
the	O
open-source	B-License
TerraLib	B-Application
which	O
use	O
a	O
middleware	B-General_Concept
approach	O
storing	O
their	O
data	O
in	O
a	O
relational	B-Application
database	I-Application
.	O
</s>
<s>
GeoMesa	B-Language
is	O
an	O
open-source	B-License
distributed	O
spatiotemporal	O
index	O
built	O
on	O
top	O
of	O
Bigtable-style	O
databases	O
using	O
an	O
implementation	O
of	O
the	O
Z-order_curve	O
to	O
create	O
a	O
multi-dimensional	O
index	O
combining	O
space	O
and	O
time	O
.	O
</s>
<s>
is	O
a	O
commercial	O
spatiotemporal	B-General_Concept
database	I-General_Concept
built	O
on	O
top	O
of	O
the	O
proprietary	O
multidimensional	O
index	O
similar	O
to	O
the	O
kd-tree	O
family	O
,	O
but	O
created	O
using	O
the	O
bottom-up	O
approach	O
and	O
adapted	O
to	O
particular	O
space-time	O
distribution	O
of	O
data	O
.	O
</s>
