Salish Sea Bathymetry Basemap

Bathymetric Base Map for the Salish Sea Bioregion. Created for the Salish Sea Atlas (https://wp.wwu.edu/salishseaatlas/). Bathymetry for the Salish Sea. 3-arc second (approximately 90 meter) spatial resolution. Vertical datum: approximately Mean Sea Level. Separate datasets for British Columbia and Washington data were downloaded from NOAA, converted from NetCDF to raster, and then combined as a Mosaic dataset using "blend" where they overlapped. The combined dataset was re-projected to UTM using Cubic Convolution resampling. The bathymetry dataset was snapped to align with the grid cells of the Salish Sea Atlas's Digital Elevation Model and clipped to the Salish Sea Atlas's Marine Waterbodies dataset. Low-lying coastal areas with missing data due to small mismatches in the coverage of bathymetry and elevation data in Canada were corrected by recalculating the elevation as 0 meters asl.