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What are the descriptions for the levels of processing?

April 26, 2017descriptions levels

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What are the descriptions for the levels of processing?

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Below are descriptions of the levels of processing previously and currently provided: While most data currently available at no-charge will be processed as Level 1T (precision and terrain corrected), certain scenes do not have ground control or elevation data necessary for precision or terrain correction, respectively. In these cases, the best level of correction will be applied (Level 1G-systematic or Level 1Gt-systematic terrain). Specific L1T scenes are available for most of the globe under the Global Land Surveys (GLS) of 1975, 1990, 2000, and 2005. These datasets can be found on GloVis or EarthExplorer.