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Crop Agriculture

COSINE OF SOLAR ZENITH (Embedded Excel) CALCULATOR for Atmospheric Correction of Landsat

CALCULATOR MAY TAKE A FEW MOMENTS TO LOAD - IT IS CLOUD-BASED. IF IT IS DOWN, ENTER SOLAR ZENITH INTO THE WEBSITE CALCULATOR FROM A WEBSITE LISTED BELOW IT.

Landsat surface reflectance (SR) can be ordered for free from the USGS. The calculator below is for converting to SR independently (as explained in tutorials and courses) - please read: Background information about USGS & GIS Ag Maps surface reflectance.

CLICK CELL AND ENTER SUN (SOLAR) ELEVATION (NOT ZENITH; WILL AUTOMATICALLY CONVERT TO ZENITH) FROM MTL FILE (can paste or manually enter elevation), and cosine of the solar zenith will be calculated for atmospheric correction process. MAY NEED TO PRESS ENTER AFTER INPUTTING SUN ELEVATION


 

The cosine of the solar zenith can also be calculated at the following website (solar zenith = [90 - solar elevation]): http://www.rapidtables.com/calc/math/Cos_Calculator.htm; https://web2.0calc.com/