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How to write an algorithm in Erdas Imagine Model maker ?


zoarder

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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

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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

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