How to determine sensitivity value and threat input value of habitat quality model

I saw many articles they used the input value from other articles,such as Polasky .But I can not know if it is useful in my area.I feel uncertain using the value according to my knowledge and experience.So i want to ask if we have scientific method to get exact input value of sensitivity and threat.And the unit of Maximum distance of threat table is m or km? I am looking forward for answer.Thanks
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