Processed Dropwindsonde Observations in FRD Format
HRD's Full-Resolution Data (FRD) files are the output from the
data received from HRD's Editsonde program as used either on our
onboard computer during a flight or, more likely, in post-flight
quality control processing. It is in a standardized ASCII format.
Each file begins with a header identifying the sonde, the date and
time the sonde was processed. There follows several lines identifying
the processing parameters, such as filters and bias corrections that
have been applied as well as processor comments. The next block
contains the launch information, such as time and location of
launch and flight level temperature, pressure and geopential altitude
at the aircraft at time of launch. The main body of data follows
begining with a header line listing each column parameter and units.
Each line of data will contain the observation sequential number,
elapsed time, the meteorological observations, as well as the latitude,
longitude, and altitude as determined by the sonde's GPS navigation chip.
The usual time interval between observations is one half second.