<div dir="ltr">Respected Friends,<div><br></div><div>Could you please guide me how to find this layer? </div><div><br></div><div><br></div><div>



<dt style="color:rgb(0,0,0);font-family:arial,sans-serif;font-size:medium;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial"><b>transmissivity_singleway</b>=<em>name</em> <b>[required]</b></dt><dd style="color:rgb(0,0,0);font-family:arial,sans-serif;font-size:medium;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial">Name of the single-way atmospheric transmissivitymap [-]</dd>

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<dt style="color:rgb(0,0,0);font-family:arial,sans-serif;font-size:medium;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial"><b>temperaturedifference2m</b>=<em>name</em> <b>[required]</b></dt><dd style="color:rgb(0,0,0);font-family:arial,sans-serif;font-size:medium;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial">Name of the difference map of temperature from surface skin to about 2 m height [K]</dd>

<br></div><div>i have Landsat 8 and meteorological data from the station(temp max, min).</div><div>Mr Yann Chemin explained for me but i did not understand.</div><div><br></div><div>it will be so helpful if any one can explain how to get these layers to be able to calculate the ET in GRASS...</div><div><br></div><div><br></div><div>Regards </div></div>