This raster layer depicts global measurements of ocean-based pollution. Ocean-based pollution is assumed to derive from commercial and recreational ship activity. See the Lineage section for complete information regarding data sources and processes. This layer is part of the Global Map of Human Impacts to Marine Ecosystems, a collection of data and analyses related to anthropogenic drivers of change in marine ecosystems.The goal of this research is to estimate and visualize the global impact that humans are having on the oceans' ecosystems.