Peak SV simply measures the strength of the sonar return as it is reflected off the bottom, and is highly correlated to the hardness of the bottom. Each layer can tell us something slightly different about the nature of the bottom. Information that is useful for determining the relative bottom type is extracted from three distinct areas, labelled in the image above as PeakSV, E1 (first return) and E2 (second return). The image above shows a typical sonar return. Information about the bottom type is extracted from several places in each sonar return, each of which provides a different value and each of which can be shown separately as different layers within the bottom composition module. It is important to note that the values that ReefMaster calculates for bottom hardness are unit-less and provide only an indication of relative changes in bottom type across the mapped area. By calculating and averaging a range of values, ReefMaster is able to determine to relative hardness and roughness of areas within the map project.
Bottom composition is determined by analysing the data within sonar log files and looking at signal returns at various positions within the returned "ping".
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