LVIS Data Structure (LDS) Descriptions

LDS v1.02 |  |  |
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
lfid | 4 | ulong |  | LVIS file identification
shotnumber | 4 | ulong |  | laser shot assigned during collection
time | 8 | 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
lfid | 4 | ulong |  | LVIS file identification
shotnumber | 4 | ulong |  | laser shot assigned during collection
time | 8 | 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
lfid | 4 | ulong |  | LVIS file identification
shotnumber | 4 | ulong |  | laser shot assigned during collection
time | 8 | 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