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Visibility by layer - total value vs sum do not match

Question asked by kkanggis on Aug 14, 2018

Hello, 

 

I am using a viewshed analysis tool and have some questions regarding the result value.

 

I assume that a sum of all layers sr needs to be the same and the total sr, but I found that my result has a quite big difference. Even the total of all % does not make 100%.

 

 

Here is a capture from CE help.

 

Percentage: 24 + 57 + 3.2 + 13.2 + 2.5 == 99.9 => almost 100%

Value: 0.59 + 1.40 + 0.08 + 0.32 + 0.06 == 2.45 => almost 2.46

(image capture: Help - )

 

 

My data:

Percentage:  42.2 + 39.8 + 0.1 + 13.8 + 0.3 == 96.2  ==> 3.8% short 

Value: 0.51 + 0.48 + 0.00 + 0.17 + 0.00 == 1.16 ==>  0.04 difference

 

 

I think this is a quite big gap between total and sum. I am not sure where I can find missing visibility values. Could you please provide any advice if I miss anything?

 

Regards, 

 

K

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