This is a description of this raw DIFFUSE mode data from COVIS. Documentation for the processed data is also available. Every cycle, COVIS completes one DIFFUSE experiment and assembles all the relevant files into one compressed folder. The contents of this folder are described here.
Oceans 3.0 API filter: dataProductCode=CDFRF
The TAR.GZ files contain the raw data and the metadata needed to process and interpret in files of CSV, JSON and BIN formats. The following table lists the types of files and the information each contains. All of the JSON files are ascii text and human readable (with some effort). Similarly the CSV files can be read directly as ascii or loaded into a spreadsheet program like Excel. The BIN files are binary. Further details are supplied within the examples below.
File Type | Contents |
|---|---|
sweep.json | Main metadata including timestamp, acquisition mode (“imaging”), and various sonar parameters (transmit pulse length, frequency, etc.). Some parameters can be set by direct interaction with the sonar and some are fixed. |
position.csv | This contains data from the attitude sensor (time, pitch, roll, heading). All measurements are in degrees. Pitch and Roll are gravity referenced. Heading is magnetic. There is one record per rotator stop. |
rotator.csv | This file contains data from the rotator motors (pitch, roll, yaw). All measurements are in degrees relative to an arbitrary reference. There is one record per rotator stop. |
index.csv | This file is derived from the above two files but contains one record per sonar ping. It lists the pings (numbering from 1 up) and gives the time (seconds, microseconds), rotator data (pitch, roll, yaw), and attitude data ( pitch, roll, heading) for each ping. |
rec_7000_xxxxxx.json | These are the metadata for each ping. Some of this information may overlap with sweep.json and some of it is set by the experimenter. |
rec_7038_xxxxxx.bin | These are the actual data files ping-by-ping. They are in binary format. There should be one rec_7038_x.bin for every rec_7000_x.json. |
Oceans 3.0 API filter: extension=tar
Examples:
index.csv
ping,seconds,microseconds,pitch,roll,yaw,kPAngle,kRAngle,kHeading 1,1322765530,891755,221.9,225.5,132.7,-0.2,-0.0,212.2 2,1322765531,97020,221.9,225.5,132.7,-0.2,-0.0,212.2 3,1322765531,347015,221.9,225.5,132.7,-0.2,-0.0,212.2 4,1322765531,597007,221.9,225.5,132.7,-0.2,-0.0,212.2 5,1322765531,847006,221.9,225.5,132.7,-0.2,-0.0,212.2 6,1322765532,96996,221.9,225.5,132.7,-0.2,-0.0,212.2 7,1322765532,347003,221.9,225.5,132.7,-0.2,-0.0,212.2 8,1322765532,596992,221.9,225.5,132.7,-0.2,-0.0,212.2 9,1322765532,846988,221.9,225.5,132.7,-0.2,-0.0,212.2 10,1322765533,96983,221.9,225.5,132.7,-0.2,-0.0,212.2 |
where
position.csv
time,kPAngle,kRAngle,kHeading 2011-12-01 18:52:09.898612,-0.15,-0.04,212.21 |
where
rotator.csv
time,pitch,roll,yaw 2011-12-01 18:52:09.898612,221.9,225.5,132.7 |
where the columns are
rec_7000_xxxxxx.json – Reson format for ascii metadata file documented in rec7000.pdf
rec_7038_xxxxxx.bin – Reson format for binary data documented in rec7008.pdf
Refer to the Discussion on the COVIS Doppler page for more information.
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