This readme file describes the .STA datafiles provided for the CU/NCAR Windcubes deployed in
support of XPIA near the Boulder Atmospheric Observatory in Mar-May 2015.

For questions, please contact Julie.Lundquist@colorado.edu, 303/492-8932.
If you use these data, please contact Julie regarding citations/authorship.

Both Windcubes are Leosphere/NRG Version 1 Windcubes.
-------------------------------
As of 20 February 2015, both units were co-located at the "lidar super-site" at the middle
south guy of the BAO: 40.004881N, 105.0039W, 1582msl per google earth.

The .STA data files provide two-minute averages of wind speed and wind direction 
at ten vertical levels. Note that the "u" and "v" as defined in these files are NOT
in meteorological coordinates, but rather in engineering coordinates: 

U positive from north -> south 
V positive from east -> west
W positive from up -> down

Therefore, 
u_meteorological = -v_native
v_meteorological = -u_native
w_meteorological = -w_native

The useful header starts on line 57 and the data start on line 58. 
The ten altitudes are defined in line 14.

Date/Time: DD/MM/YYYY HH:MM:SS UTC
Wiper Count: ignore unless suspect precipitation (but often poor metric for precip)
Tm: internal temperature (deg Celsius) of the laser unit
****** begin series of quantities that will repeat for each of ten heights **********
Vhm1: mean scalar averaged horizontal wind speed (m/s) at the first (lowest) measurement altitude for the 2-min period
dVh1: standard deviation of scalar averaged horizontal wind speed (m/s)
VhMax1: maximum 1-sec wind speed measurement during the 2-minute period (m/s)
VhMin1: minimum " "
Azim1: vector-averaged wind direction of altitude 1
um1: average u-component at altitude 1
du1: standard deviation of u-component at altitude 1
vm1: average v-component at altitude 1
dv1: standard deviation of v-component at altitude 1
wm1: average w-component at altitude 1
dw1: standard deviation of w-component at altitude 1
CNRm: average CNR for the two-minute period (dB); *** we often use -17 dB as a threshold
dCNR: standard deviation of CNR
CNRmax: maximum CNR
CNRmin: minimum CNR
spectral_broadening: 2 minute averaged spectral broadening (converted to m/s)
dspectral_broadening: standard deviation for previous value
Avail.1: percentage of data available at this altitude (assuming CNR threshold of -22 dB)
******
Repeats for next 9 levels

*****
Note on time stamp:
9 April 2015 lidars were compared to time.gov. Both lidars lagged time.gov
by one second.