ALCF

Automatic Lidar and Ceilometer
Framework

Command line interface

alcf calibrate

alcf calibrate - calibrate ALC backscatter

Calibration based the O’Connor et al. (2004) method of lidar ratio (LR) in fully opaque stratocumulus clouds.

Usage: alcf calibrate <type> <time_periods> <input> <output>

Types:

Time periods file:

A text file containting start and end time (see Time format below) of a time period separated by whitespace, one time period per line:

<start> <end>
<start> <end>
...

where start is the start time and end is the end time.

Time format:

“YYYY-MM-DD[THH:MM[:SS]]”, where YYYY is year, MM is month, DD is day, HH is hour, MM is minute, SS is second. Example: 2000-01-01T00:00:00.

Examples:

alcf calibrate time_periods.txt lidar calibration.txt

Read time periods from time_periods.txt, lidar profiles from the directory lidar and write the calibration coefficient to calibration.txt.