I'm using GrassGis 7.0.0 for Landsat imagery. In the description of i.Landsat.toar under http://grass.osgeo.org/grass65/manuals/i.landsat.toar.html is under dos3 and dos4: TAUz = exp[-t/sin(e)] but what is this "t"? I don't find any description about what t is. Can anyone help?
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