 OMI follows in the heritage of TOMS, SBUV, GOME, SCIAMACHY, and GOMOS.It is a wide-field-imaging spectrometer with a 114° across-track viewing angle range that provides a 2600 km wide swath, enabling measurements with a daily global coverage.OMI is continuing the TOMS record for total ozone and other atmospheric parameters related to ozone chemistry and climate.