COVIS Plume Imaging Time Series

This is a description of the COVIS processed IMAGING mode data. Documentation for the raw data is also available.

This data product is extremely data intensive. Processing this data takes time. Data products are pre-processed for quick retrieval. However, the pre-processing may not be up to date, in that case, data products will be generated on-the-fly, which can take 5-20 minutes per 3 hour file.

Oceans 2.0 API filterdataProductCode=CPID

Revision History

Formats

MAT, PNG and PDF data products are generated for the IMAGING mode. Content descriptions and example MAT and PNG files are provided below. Detailed information and further concern please refer to Principle Investigator’s Website

MAT

MAT file contains two structures: metadata and covis. The metadata structure contains the following information:

The covis structure contains all the parameter information and the gridded data. Structure covis contains the following structures: type, comments, user, sonar, processing, grid, sweep, ping and burst.

type: type of mode (i.e., imaging for IMAGING mode)
comments: information from the COVIS team used to give some description for the experiment.

user: structure containing input parameters for MATLAB code to generate MAT and PNG files from raw tar file.

sonar: structure containing information about sonar itself.

processing: structure containing parameters controlling the processing

grid: structure contains what kind and size of grid used in the final stage of processing.

sweep:

ping: structure array contains covis ping meta. A structure is created when the parameters change. One structure contains the following parameters:

burst: a structure for each scan. Generally the sonar changes elevation, acquires data and repeats.elev

Oceans 2.0 API filter: extension=mat

PNG

The plot for the IMAGING mode shows the isosurfaces of the gridded data in the MAT file. Red, purple and blue isosurfaces are constant backscatter intensity surfaces at 65, 75, and 85 dB. Green-to-yellow surface is the bathymetry from the MBARI-UW 2008 multi-beam survey; black lines are contours of elevation. All distances are in meters relative to the sonar position. Tick labeling on the axes was left off due to technical difficulties in rendering the fonts (we could either render the 3D transparency or the fonts but not both, this is a short coming of running Matlab in Linux, which may improve in the future).

Oceans 2.0 API filter: extension=png

Example:

PDF

The PDF plot shown is the same as the PNG, however, PDF files can contain multiple plots in a vectorized form, which is better for high resolution printing or zooming.

Oceans 2.0 API filter: extension=pdf

Discussion

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