i.lswt computes Lake Water Surface Temperature (LSWT) from moderate resolution polar orbiting satellites with dual thermal channels. Given the Top Of Atmosphere(TOA) Brightness Temperatures (BT) derived from the thermal channels of the supported satellites, the module computes surface temperature. For water surface (lakes/inland water bodies), the module uses a simplified non-linear split-window algorithm.


The non-linear split window equation used here is:
LSWT = Ti + c1 * (Ti - Tj) + c2 * (Ti - Tj) ^ 2 + c0
Where Ti and Tj are Brightness temperatures derived from dual thermal channels 10.5 - 11.5 micro m and 11.5 - 12.5 micro m respectively. The split window equation and the coefficients c0,c1,c2 are taken from Jimenez-Munoz (2008).


r.mask vect=watermask cats=1 --o
i.lswt in1=NSS.LHRR.NP.D14177.S1312_b4 in2=NSS.LHRR.NP.D14177.S1312_b5 basename=NSS.LHRR.NP.D14177.S1312 satellite=NOAA19-AVHRR


The satellite specific split-window coefficients are taken from: A new method to develop continuos time series of LSWT from historical AVHRR is explained below, uses the same split window technique implemented here:


i.landsat8.swlst, i.emissivity


Sajid Pareeth; Fondazione Edmund Mach

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