zoarder Posted January 27, 2015 Report Share Posted January 27, 2015 Dear All, i hope you all are fine. I am doing my Msc thesis on Urban Heat island modeling. One part of the model i have a calculation regarding LST calculation from Landsat ETM image. I am using mono-window technique. Manually i calculated LST for one pixel and its ok. But the problem is working in Erdas imagine model maker. My algorithm is showing error. My model is as follows in erdas model maker. { -67.355351 ( 1-$n4_memory - $n6_memory ) + ( 0.458606 ( 1 - $n4_memory - $n6_memory ) + $n4_memory + $n6_memory ) * ( $n8_br_t_k ) - ($n6_memory) * 310.46} / ($n4_memory) here , LST = { a (1-C-D) + (b (1-C-D)+C+D) Tb - D Ta} / C where, a = -67.355351 b = 0.458606 C= Ei * ti (Ei is emissivity and ti is transmissivity) D= (1-ti) [1+(1-Ei)*ti] Ta is mean atmospheric temp, 310.46 k (calculated) but this model is giving error, can anyone help me ? regards Muqit Zoarder 1 Quote Link to comment Share on other sites More sharing options...
Lurker Posted January 27, 2015 Report Share Posted January 27, 2015 what version of ERDAS do you use? and please take the screenshoot or detail of error and post here Quote Link to comment Share on other sites More sharing options...
3dbu Posted January 27, 2015 Report Share Posted January 27, 2015 Dear All, i hope you all are fine. I am doing my Msc thesis on Urban Heat island modeling. One part of the model i have a calculation regarding LST calculation from Landsat ETM image. I am using mono-window technique. Manually i calculated LST for one pixel and its ok. But the problem is working in Erdas imagine model maker. My algorithm is showing error. My model is as follows in erdas model maker. { -67.355351 ( 1-$n4_memory - $n6_memory ) + ( 0.458606 ( 1 - $n4_memory - $n6_memory ) + $n4_memory + $n6_memory ) * ( $n8_br_t_k ) - ($n6_memory) * 310.46} / ($n4_memory) here , LST = { a (1-C-D) + (b (1-C-D)+C+D) Tb - D Ta} / C where, a = -67.355351 b = 0.458606 C= Ei * ti (Ei is emissivity and ti is transmissivity) D= (1-ti) [1+(1-Ei)*ti] Ta is mean atmospheric temp, 310.46 k (calculated) but this model is giving error, can anyone help me ? regards Muqit Zoarder Pls share a snapshot of error for better idea of problem and then we can help you, regards Quote Link to comment Share on other sites More sharing options...
bdsmolla Posted January 27, 2015 Report Share Posted January 27, 2015 What is your output file type? it should be float, not 8 or 16 bit signed/unsigned integer... Quote Link to comment Share on other sites More sharing options...
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