Location-Allocation: Where does Drive Time come from?

Discussion created by Kaspatoo on Jan 1, 2012
Latest reply on Jan 8, 2012 by Kaspatoo

I am working with the NA Location-Allocation. Every Time the Analysis Options offer me to choose between Drive Length and Drive Time as Impedance. When I build the NetworkDataset I just type a cost attribute referencing the shape length but none for drive times.

So, why can I chose driveTime impedance? Where does it come from? Where does NA get the values from?

What happens when I implement a time attribute also before building the dataset? will then my attribut be used for drive time?

thanks for quick help