Roll data are records of the deviation of the platform from the horizontal in degrees. That is, a roll of 0 degrees indicates a horizontal platform.
Positive roll on a vessel in motion indicates starboard roll, that is the starboard side of the platform lowers and the port side rises.
Roll data can used with singlebeam data and multibeam data. Use roll data as an input operand with the:
Echoview derives roll data from one of the following sources:
Roll data affects the transducer orientation only, not its position. Echoview currently assumes the position of the transducer and roll sensor to be at the center of platform motion.
Roll data will affect the orientation of the data in a multibeam variable and thus affect:
Display of Multibeam echograms
Bottom surface detection from multibeam echograms
3D schools detection on multibeam echograms
Multibeam ping curtain creation from multibeam echograms
Note: The beam select operator will not function on roll corrected data. The Angle select operator is intended to replace it. See About Multibeam echograms for further information.
Roll data and pitch data will affect the position of data in a singlebeam virtual variable if the Motion correction operator is applied. This in turn, will affect biomass estimates that are derived from such a virtual variable. Refer to About pitch data for more information.
Exporting roll data
Roll graph
Roll data file format
Creating 3D objects
About pitch data