Calculate Land Surface Temperature from Landsat images
Landsat 1-8 Level-1 data products consist of quantized and calibrated scaled Digital Numbers (DN) representing the multispectral image data.
Landsat Level-1 data can be rescaled to the top of atmosphere (TOA) reflectance and/or radiance using radiometric rescaling coefficients provided in the metadata file (MTL.txt) that is delivered with the Level-1 product. The MTL file also contains the thermal constants needed to convert thermal band data to TOA brightness temperature (BT). Formulas for these coversions are provided below.
1. Conversion to TOA Radiance: Landsat Level-1 data can be converted to TOA spectral radiance using the radiance rescaling factors in the MTL file.
2. Conversion to TOA Reflectance: Reflective band DN’s can be converted to TOA reflectance using the rescaling coefficients in the MTL file.
3. Conversion to Top of Atmosphere Brightness Temperature: Thermal band data can be converted from spectral radiance to top of atmosphere brightness temperature using the thermal constants in the MTL file.
4. Atmospheric Correction (DOS1).
Learn more … about formulas
To extract Land Surface Temperature (LST) from Landsat images you can use raster calculator.
In this course I will show you how to extract Land Surface Temperature (LST) from Landsat images quickly by using the Semi-Automatic Classification Plugin (SCP).