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The Operational Land Imager (OLI) is a Ball Aerospace & Technologies built instrument that fly on Landsat Data Continuity Mission (LDCM). LDCM is the successor to Landsat 7 and was launched in 2013.
OLI uses 4-mirror telescope with fixed mirrors. The OLI is a Push broom scanner.
References
Operational Land Imager Wikipedia(Text) CC BY-SA