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Dataset: acoustic backscatter120 kHz
Deployment: NBP0104

120 kHz acoustic backscatter relative decibels
Principal Investigator: 
Peter H. Wiebe (Woods Hole Oceanographic Institution, WHOI)
BCO-DMO Data Manager: 
Ms Dicky Allison (Woods Hole Oceanographic Institution, WHOI BCO-DMO)
Project: 
Deployment Synonyms:
 GLOBECII
Coordinated Deployments:
 LMG0106
Data URL:
 https://osprey.bco-dmo.org/dataset-deployment/450369/data

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Description

These relative decibel values are the result of processing the NBP0104 and NBP0103 volume backscatter data from BIOMAPER-II at 120KHz. They are relative decibel values derived from the backscatter data (in volts) and normalized according to the algorithms in the Matlab routine docurtainnf.m. The algorithm includes the following steps:

 

  1. Add 10-10 to each value
  2. Multiply result by by 1010 to get values with units of m2/m3 (called sv)
  3. Take the log (called SV)

These are energy backscattering values.

The values are presented as twenty groups of 20 numbers in each group. Each number is displayed as NNN, where there is an assumed decimal point at NN.N and all values should be negated. That is NNN, is really -NN.N.

See the related objects sv120coords_0104 and sv120depths_0104 for NBP0104 and sv120amcoords_0103, sv120pmcoords_0103 and sv120depths_0103 for NBP0103.

More information about this dataset deployment