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 "description": "<DIV STYLE=\"text-align:Left;\"><DIV><DIV><P><SPAN>As a part of Benthic Terrain Modelling (BTM), the ability to constrain variations in seafloor substrate is of great benefit. During processing of multibeam bathymetry data, it may be possible to extract the strength of the return backscatter signal from isonified seafloor (in decibels), in conjunction with regular constraints of seafloor depth. These processed backscatter grids can be used to constrain relative changes in seabed substrate across the survey area.<\/SPAN><SPAN> <\/SPAN><SPAN>As backscatter strength is directly linked to the strength of the output signal, if acquisition parameters change throughout the survey then this can have an impact on the output backscatter grid.<\/SPAN><\/P><P><SPAN>These data present a processed backscatter grid (<\/SPAN><SPAN>1<\/SPAN><SPAN> m resolution) of the region surveyed during hydrographic survey HS5<\/SPAN><SPAN>3<\/SPAN><SPAN> - <\/SPAN><SPAN>Kawau Island<\/SPAN><SPAN>. Survey HS5<\/SPAN><SPAN>3<\/SPAN><SPAN> was undertaken by Discovery Marine Limited (DML) on behalf of Land Information New Zealand (LINZ) for hydrographic charting purposes. This grid has been subsequently reprocessed by Taihoro Nukurangi - NIWA to undertake BTM analysis.<\/SPAN><\/P><\/DIV><\/DIV><\/DIV>",
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