Keywords : multilayer

Multilayer

For a given sounding, the multibeam system provides the following information: depth, across and along-track distance, received beam angle, transmit and receive beam numbers, two-way travel time of the acoustic pulse, bottom detection mode, etc…

SonarScope is particularly well adapted to manage and process data organized in a multi-layers environment: with a simple point and click action, one can get the information contained in each layer at the same location. A synchronization mechanism allows one to browse through all layers, while keeping the same selected geographical area. Statistical analyses involving different layers are also possible, such as getting the mean of an image as a function of grazing angle.

Sonar data are arranged as a set of arrows called pings (swath), which correspond to all the soundings acquired in a ping cycle. At the beginning of the ping cycle, each sensor's value is logged: gyro, pitch, roll, positions, etc… A sonar image is thus linked with the sensor’s time series, pertaining to that given dataset and in synch with each ping. The time series can be plotted as curves, displayed in conjunction with the image.

Example of multilayers data

This is an example showing 4 layers of information from a single set:

  • Depth :
  • Reflectivity :
  • TxAngle : transmit angle
  • TxBeamIndex : transmit beam number

Images are displayed vertically:

  • Horizontal axis: across-track distance
  • Vertical axis: ping cycle