Geoscience Reference
In-Depth Information
Table 15.1
Point data records in LAS file
Attribute name
PDRF
a
Comment
X
Point location information
0
Y
Point location information
0
Z
Point location information (height)
0
Intensity
Integer representation of the pulse return
magnitude (see Sect.
15.4.4
)
0
Return number
Return number for a given output pulse
0
Number of returns
Total number of returns for a given pulse
0
Classification flags
Indicate special point characteristics
6
Scanner channel
0-3 (0 for single scanner channel)
6
Scan direction flag
0 (left to right) or 1 (right to left)
0
Edge of flight line
1 if end of scan
0
Classification
0 if never classified
0
User data
Open field that can be filled by LiDAR
vendor
0
Scan angle
-90 (left) to
+
90 (right)
0
Point source ID
File source ID from which this point orig-
inated (0 if this file)
0
GPS time
Time tag at which the point was acquired
1
Red
Red image channel value associated with
this point
2
Green
Green image channel value associated with
this point
2
Blue
Blue image channel value associated with
this point
2
NIR
Near infrared image channel value associ-
ated with this point
8
Wave packet descriptor index
For waveform packets stored within LAS
file
4
Byte offset to waveform data
For data stored in auxiliary file
4
Waveform packet size in bytes
Size of the waveform packet associated
with this return (in bytes)
4
Return point waveform location
Offset to locate point within waveform
from first digitized value (in picoseconds)
4
X(t)
X parameter to extrapolate points along
associated waveform
4
Y(t)
Y parameter to extrapolate points along
associated waveform
4
Z(t)
Z parameter to extrapolate points along
associated waveform
4
a
available from point data record format (PDRF) version
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