Hello Guys,

I am using a "Network Analyst" tool in order to generate multiple shortest paths between about 1000 O-D pairs. When I run shortest path tool the first time, a first set of routes is calculated. Then rom the table of attributes I can obtain the length of each route. At the same time, I decided to "check" my lengths using "Calculate Geometry" tool and recalculate the same lengths. So, when I ran "Calculate Geometry" tool for the same routes I obtained lengths which were drastically different from the first set. Some of the largest differences are 7 km on a 16 km length. Thank you.

Vlad

[ATTACH=CONFIG]19354[/ATTACH]

I am using a "Network Analyst" tool in order to generate multiple shortest paths between about 1000 O-D pairs. When I run shortest path tool the first time, a first set of routes is calculated. Then rom the table of attributes I can obtain the length of each route. At the same time, I decided to "check" my lengths using "Calculate Geometry" tool and recalculate the same lengths. So, when I ran "Calculate Geometry" tool for the same routes I obtained lengths which were drastically different from the first set. Some of the largest differences are 7 km on a 16 km length. Thank you.

Vlad

[ATTACH=CONFIG]19354[/ATTACH]

Did you first export the routes layer to be a separate layer ? because routes layer is temporary and running calculate geometry may lead to misleading results. Also as i see, calculated length is always less than route length, so it suggests that calculate geometry may not be doing it for the whole route. just check again after exporting the routes to a permanent file.

regards,