<s>
The	O
LAS	B-Application
(	O
LASer	O
)	O
format	O
is	O
a	O
file	O
format	O
designed	O
for	O
the	O
interchange	O
and	O
archiving	O
of	O
lidar	O
point	B-Algorithm
cloud	I-Algorithm
data	I-Algorithm
.	O
</s>
<s>
A	O
LAS	B-Application
file	O
consists	O
of	O
the	O
following	O
overall	O
sections	O
:	O
</s>
<s>
Section	O
Description	O
Public	O
header	O
block	O
Describes	O
format	O
,	O
number	O
of	O
points	O
,	O
extent	O
of	O
the	O
point	B-Algorithm
cloud	I-Algorithm
and	O
other	O
generic	O
data	O
.	O
</s>
<s>
Point	O
data	O
records	O
Data	O
for	O
each	O
of	O
the	O
individual	O
points	O
in	O
the	O
point	B-Algorithm
cloud	I-Algorithm
,	O
including	O
coordinates	O
,	O
classification	O
(	O
e.g.	O
</s>
<s>
Extended	O
variable	O
length	O
records	O
(	O
EVLR	O
)	O
Introduced	O
with	O
LAS	B-Application
1.3	O
,	O
EVLRs	O
are	O
similar	O
to	O
VLRs	O
but	O
are	O
located	O
after	O
the	O
point	O
data	O
records	O
and	O
allow	O
a	O
much	O
larger	O
data	O
payload	O
per	O
record	O
due	O
to	O
the	O
use	O
of	O
8-byte	O
size	O
descriptors	O
.	O
</s>
<s>
A	O
LAS	B-Application
file	O
contains	O
point	O
records	O
in	O
one	O
of	O
the	O
point	O
data	O
record	O
formats	O
defined	O
by	O
the	O
LAS	B-Application
specification	O
;	O
as	O
of	O
LAS	B-Application
1.4	O
,	O
there	O
are	O
11	O
point	O
data	O
record	O
formats	O
(	O
0	O
through	O
10	O
)	O
available	O
.	O
</s>
<s>
A	O
standardized	O
way	O
of	O
interpreting	O
such	O
extra	O
bytes	O
was	O
introduced	O
in	O
the	O
LAS	B-Application
1.4	O
specification	O
,	O
in	O
the	O
form	O
of	O
a	O
specific	O
EVLR	O
.	O
</s>
<s>
LAS	B-Application
file	I-Application
format	I-Application
is	O
not	O
compressed	O
but	O
there	O
is	O
an	O
open	O
source	O
project	O
LASzip	O
which	O
define	O
the	O
open	O
file	O
format	O
LAZ	O
to	O
lossless	O
compress	O
LAS	B-Application
data	O
.	O
</s>
