Use of Routing Criteria

Discussion created by abkowijc on Dec 8, 2011
Latest reply on Dec 14, 2011 by jsandhu-esristaff

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I am using Network Analyst to route between two points. I am able to route by minimum travel time and in a separate application by minimizing population exposure. Is there a way for me to find the optimal route if I am interested in putting equal weight on travel time and population exposure?

Thanks,
Jason

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jsandhu-esristaff Dec 14, 2011 5:55 AM
Generally Network Analyst minimizes ONE cost attribute to find a shortest path. But it also looks at the cost being scaled due to some external factors such as weather, traffic, etc. There can be at least two ways to go around trying to combine travel time and population exposure. Do note that these two attributes are not in the same units so there is no straightforward way to combine them 50-50 or equal weight as you say.
Asuming you have the population exposure for each edge, the first method can be to add a new cost attribute that is a combination of the two travel time and population exposure by some formula and then use this in the route solver. The second can be to load in the population exposure as a scaled cost line barrier (or if you have population polygons use scaled cost polygon barriers) and scale the cost appropriately based on the population and then solve.
Jay Sandhu
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