10/18/2013
Hoh River Watershed - Delivery 2

Data Collection Dates:  
4/14/12, 4/15/12, 4/17/12, 4/19/12, 4/20/12, 4/21/12, 10/6/12, 10/7/12, 10/10/12, 3/31/13, 4/1/13, 6/29/13, 6/30/13, 7/24/13

These text files contain kinematicly-corrected trajectory data presented as a 1Hz sampling of the original 200Hz Smoothed Best Estimated Trajectory (SBET) data. The purpose of this data is to provide aircraft position and attitude during LiDAR acquisition. (Spring 2012 SBET files were delivered in Delivery 1)  

The following settings were used:  

Leica ALS 60  Instrument Parameters (4/14/12, 4/15/12, 4/17/12, 4/19/12, 4/20/12, 4/21/12);
Beam diameter: 21 cm, 
Pulse rate: 196-107.8 kHz,
Maximum returns: 4, 
Speed: 105 knots,
Overlap: 60 %,
Laser output power: 17%
Field of vew (FOV): 28°, 
Beam wavelenth: 1064 nm,
Frequency of GPS sampling: 2 Hz,
Frequency of IMU sampling: 200 Hz,
Swath width: 449 m 
AGL: 900 m 
Average pulse density: 8


Leica ALS 50 Phase II Instrument Parameters (4/15/12, 4/21/12);
Beam diameter: 21 cm, 
Pulse rate: 96-107.8 kHz,
Maximum returns: 4, 
Speed: 105 knots,
Overlap: 60 %,
Laser output power: 26%
Field of vew (FOV): 28°, 
Beam wavelenth: 1064 nm,
Frequency of GPS sampling: 2 Hz,
Frequency of IMU sampling: 200 Hz,
Swath width: 449 m 
AGL: 900 m 
Average pulse density: 8


Leica ALS 50 Phase II Instrument Parameters (10/6/12, 10/7/12, 10/10/12);
Beam diameter: 21 cm, 
Pulse rate: 93-107.8 kHz,
Maximum returns: 4, 
Speed: 105 knots,
Overlap: 65 %,
Laser output power: 26%
Field of vew (FOV): 28°,
Beam wavelenth: 1064 nm,
Frequency of GPS sampling: 2 Hz,
Frequency of IMU sampling: 200 Hz,
Swath width: 448 m 
AGL: 900 m 
Average pulse density: 8


Leica ALS60  Instrument Parameters (3/31/13, 4/1/13):
Beam diameter: 21 cm,
Pulse rate: 93 - 107.8 kHz,
Maximum returns: 4,
Speed: 105 knots,
Overlap: 65 %,
Laser power: 17 %,
Field of vew (FOV): 28°,
Beam wavelenth: 1064 nm,
Frequency of GPS sampling: 2 Hz,
Frequency of IMU sampling: 200 Hz,
Swath width: 449 m,
AGL: 900 m,
Average pulse density: 8


Leica ALS60  Instrument Parameters (6/29/13, 6/30/13):
Beam diameter: 21 cm,
Pulse rate: 93 - 107.8 kHz,
Maximum returns: 4,
Speed: 105 knots,
Overlap: 65 %,
Laser power: 26 %,
Field of vew (FOV): 28°,
Beam wavelenth: 1064 nm,
Frequency of GPS sampling: 2 Hz,
Frequency of IMU sampling: 200 Hz,
Swath width: 449 m,
AGL: 900 m,
Average pulse density: 8


Leica ALS60  Instrument Parameters (7/24/13):
Beam diameter: 23 cm,
Pulse rate: 85-99.2 kHz,
Maximum returns: 4,
Speed: 105 knots,
Overlap: 60 %,
Laser power: 28.9 %,
Field of vew (FOV): 30°,
Beam wavelenth: 1064 nm,
Frequency of GPS sampling: 2 Hz,
Frequency of IMU sampling: 200 Hz,
Swath width: 536 m,
AGL: 1000 m,
Average pulse density: 8
	

On each collection date, there was no cloud cover below 5000 feet and no precipitation.  Flightline specifics are provided in the attribute tables of the flightline and SBET shapefiles.  Ancillary equipment includes:  Trimble R7 receivers, Trimble R8 receivers, Trimble HPB450 radios, Trimble TSC2 controllers.

The ASCII file is comma delimited with the following field definitions:

GPS time (s), Northing (ft), Easting (ft), Height (ft), Roll (degree), Pitch (degree), True Heading (degree), Easting Velcocity (m/s), Northing velocity (m/s), Heading Velocity (m/s), Standard Deviation of Latitude (m), Standard Deviation of Longitude (m), Standard Deviation Ellipsoid Height (m), Standard Deviation of Roll (arcSec), Standard Deviation of Pitch (arcSec), Standard Deviation of True Heading (arcSec), Standard Deviation of Easting Velocity (m/s),Standard Deviation of Northing Velocity (m/s), Standard Deviation of Heading Velocity (m/s)


For full information on methods and accuracy, please see accompanying report (Hoh_River_Delivery_2_LiDAR_Report).

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Data created by:
Watershed Sciences
517 SW 2nd Ave, Suite 400
Corvallis, OR 97333
ph: 541.752.1204