Atmospheric correction for Landsat thermal data according to Jimenez-Munoz and Sobrino (Sobrino et al. 2004) - QGIS script.
Script is usable for Landsat data before 2000. For newer data see https://atmcorr.gsfc.nasa.gov
You need QGIS, version 2.x and active Processing toolbox. Copy script files into the Scripts folder (see Processing/Options/Scripts/Scripts folder). It is also possible installing script from Processing tools panel: Scripts/Tools/Add script from file. The second way is easier however only script without help is installed.
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Sobrino, J.A., Jiménez-Muñoz, J.C., Paolini, L., 2004. Land surface temperature retrieval from LANDSAT TM 5. Remote Sensing of Environment 90, 434–440. https://doi.org/10.1016/j.rse.2004.02.003