LVIS Data Structure (LDS) Descriptions
LDS v1.02 PDF Print E-mail

Date Created: 2006/04/17

Byte Order:
- All data items are Big Endian unless otherwise noted.

Reference Frame:
- International Terrestrial Reference Frame (ITRF 2000) / WGS-84 Ellipsoid.

General Notes:
- A release is comprised of two or more file types sharing a common origin.  All files within the release have equal record numbers, and correspond to one another laser shot for shot.  (i.e. record 1000 in the .lge file will be the same laser shot as record 1000 in the .lce file for a given data set)

LVIS Canopy Elevation (.lce) File Description:

Item
Byte Size
Format
Units Item Description
lfid4
ulong
 LVIS file identification
shotnumber4
ulong
 laser shot assigned during collection
time8
double
seconds
UTC decimal seconds of the day
tlon
8 double degrees
longitude of the highest detected return (degrees east)
tlat
8 double degrees
latitude of the highest detected return (degrees north)
zt
4 float meters
elevation of the highest detected return (m) (i.e., zg + rh100 - see below)
 Total 28
    bytes per record

LVIS Ground Elevation (.lge) File Description:

Item
Byte Size
Format
Units Item Description
lfid4
ulong
 LVIS file identification
shotnumber4
ulong
 laser shot assigned during collection
time8
double
seconds
UTC decimal seconds of the day
glon 8 double degrees longitude of the lowest detected mode within the waveform (degrees east)
glat  8 double degrees latitude of the lowest detected mode within the waveform (degrees north)
zg
4 float meters mean elevation of the lowest detected mode within the waveform (m)
rh25
4 float meters height (relative to zg) at which 25% of the waveform energy occurs (m)
rh50
4 float meters height (relative to zg) at which 50% of the waveform energy occurs (m)
rh75
4 float meters height (relative to zg) at which 75% of the waveform energy occurs (m)
rh100
4 float meters height (relative to zg) at which 100% of the waveform energy occurs (m)
 Total 44
    bytes per record

LVIS Geolocated Waveform (.lgw) File Description:

Item
Byte Size
Format
Units Item Description
lfid4
ulong
 LVIS file identification
shotnumber4
ulong
 laser shot assigned during collection
time8
double
seconds
UTC decimal seconds of the day
lon0
8 double degrees longitude of the highest sample of the waveform (degrees east)
lat0
8 double degrees latitude of the highest sample of the waveform (degrees north)
z0
4 float meters elevation of the highest sample of the waveform (m)
lon431
8 double degrees longitude of the lowest sample of the waveform (degrees east)
lat431
8 double degrees latitude of the lowest sample of the waveform (degrees north)
z431
4 float meters elevation of the lowest sample of the waveform (m)
sigmean
4 float counts signal mean noise level, calculated in-flight (counts)
wave
432 byte counts return waveform, recorded in-flight (counts)
 Total 484
    bytes per record