Global biosphere, June 2002. Global satellite map showing chlorophyll levels in the oceans and vegetation density on land, during June 2002. The ocean colours show concentration of chlorophyll (due to phytoplankton blooms) in milligrams per cubic metre, from low levels (dark blue, 0.01) to higher levels (light blue and green, 1; to yellow and red, 60). The vegetation (Normalized Difference Vegetation Index, NDVI) ranges from low (white-brown) to high (dark green). The chlorophyll data was obtained by the Sea-viewing Wide Field-of-view-Sensor (SeaWiFS) on the OrbView-2 spacecraft. SeaWiFS was also able to measure the colours for land vegetation.