.:cdp:Aircraft
Processing DMT Cloud Droplet Probe (CDP) data from SEA M300 file
process_raw (Level 1)
Purpose
Extracts the diagnostic data and raw channel counts from the SEA M300 data acquisition system file (*.sea). The process_raw script creates the *.counts.cdp.raw file. If particle-by-particle (pbp) data are available, extract pbp data and save them to the *.adc.cdp.raw file.
Subroutines
The process_raw script calls the IDL subroutines:
- process_WMI.pro
- cdp.pro (called by process_WMI.pro)
- create_cdp_header.pro (called by cdp.pro)
- create_cdp_pbp_header.pro (called by cdp.pro)
Required Input Files
*.sea
Output Files
Among many other files, it generates:
- *.counts.cdp.raw
Syntax
process_raw <-d> <-v> <-vm> input_file
Example Syntax
process_raw ${CoPAS_DIR}/ADTAE/TestData/FlightData/20140429_152103/PostProcessing/14_04_29_15_21_03.sea
cdp_counts2conc (Level 3)
Purpose
Calculates the concentration of cloud droplet particles based on the CDP channel counts and the true air speed. Also calculates bulk parameters such as liquid water content, mean diameter, etc.
Required Input Files
- *.counts.cdp.raw
- *.basic.raw
Optional Input Files
*.serialB.aimms.*
Optional Keywords
- fast - skips long duration processing
- final - causes output data to be tagged with 'Final' instead of 'Preliminary' for data type.
- csh_error - errors are returned to the shell calling program instead of occurring in the IDL code.
- tas - the true air speed [m/s] to use instead of values from the basic_file.
Output files
*.conc.cdp.raw
Syntax
cdp_counts2conc <fast> <final> <csh_error> <tas = value> CDP_counts_file <basic_file> <serialB.aimms_file>
Examples
cdp_counts2conc 21_11_18_05_31_30.counts.cdp.raw 21_11_18_05_31_30.basic.4Hz
avgfields: *.conc.cdp.raw to *.conc.cdp.1Hz (Level 3)
Purpose
To average the data to convert from a higher sampling frequency to a lower frequency (i.e. from 4 samples per second to 1 sample per second).
Required Input Files
- *.conc.cdp.raw
Require Keyword Input
- points - the number of samples to average per new unit of sampling frequency.
Output files
*.conc.cdp.1Hz
Syntax
avgfields points=${freq} < ${namebase}.conc.cdp.raw > ${namebase}.conc.cdp.1Hz
Example
avgfields points=4 < 21_11_18_05_31_30.conc.cdp.raw > 21_11_18_05_31_30.conc.cdp.1Hz
Level 4 Processing
(mergefield - merge in TAS data from *.basic.* file into *.adc.cip.* file to create *.adc_tas.cdp.raw) adc2vol.py - takes in the *.adc_tas.cdp.raw file and makes the adc_vol.cdp.raw file