When an elevation raster dataset contains values for both topography and bathymetry, often the best solution to this is to split it into two new rasters: one for the topography and one for the bathymetry. The reason is that symbolizing this data is difficult. This is because a color ramp that contains appropriate hues for both bathymetry and topography must be adjusted so that it shows the shoreline exactly in the right place, at zero elevation. Read More...
