Morphometric parameters of the Coral Belt Mounds (CBM), Namibian coral mound province ...

• Main Authors: Tamborrino, Leonardo, Purkis, Sam, Hebbeln, Dierk
• Format: Dataset
• Language: English
• Published: PANGAEA 2022
• Subjects: cold-water coral; coral mounds; Lophelia pertusa; Morphometry; Identification; Number of nodes; LONGITUDE; LATITUDE; Perimeter; Net area; Bounding area; Principal axes ratio; Convexity; Compactness; Circular variance; Direction of principal axis; Length of principal axis; Length of axis ortoghonal to PAX; Distance from nearest polygon; Nearest polygon identification number; Dimension, fractal; Parameter; Fractal Span; DEPTH, water; Depth, top/min; Depth, bottom/max; Depth, difference; Depth, mode; Depth, median; Ratio between 3D surface and planar surface; Volume; Direction; ELEVATION; Slope angle; Mound height/PAX length ratio; Height of mound; Slope; Elevation, standard deviation; Slope, standard deviation; Slope, maximum underlying; Slope, average, underlying; Slope, average, underlying standard deviation; Multibeam/Parasound; Grab; EM1002 multibeam echosounder; Mound footprint polygon; 3D relief of the coral mound/coral mound footprint polygon; 3D relief of the coral mound; M122; MSM20/1
• Online Access: https://dx.doi.org/10.1594/pangaea.944595; https://doi.pangaea.de/10.1594/PANGAEA.944595

Quantitative morphometric analyses were carried out for each mound following the workflows presented by Purkis et al. (2007) The coral mound base was defined following the methodological approach of Correa et al. (2012) using the dip angle map, generated from the digital elevation model (DEM), to extract closed polygons that follow the 3°-contour line. This 3°-cutoff has been qualitatively validated with a comparison between the DEM and the dip angle. Small-scaled polygons within mound perimeters and resulting from bathymetry artefacts were filtered out. Manual editing was applied to split simple merged mound structures (e.g. twin-peak mounds) based on higher cut-off slope values (4-5°). Furthermore, polygons describing the mound footprint have been corrected to remove unrealistic shapes especially common for the CBM. The DEM was subsequently re-gridded to generate hypothetical bathymetric maps without mounds, for which the vertical relief beneath each removed mound was interpolated from the mound ...