# Network analyst in the 3D

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11-09-2012 03:37 AM
New Contributor
Good day.

I am learning application Network analyst in the 3D.

I saw expression [SLength] / (3 * 26.8224)

I want to ask you, what does it mean this number 26.8224 in this expression ?

Tags (2)
6 Replies
Esri Regular Contributor
I want to ask you, what does it mean this number 26.8224 in this expression ?

Looks like an expression to set up walk times.

That number, 26.8224 is the number of meters you can walk in 1 minutes if you are walking at a rate of 1 mile per hour.

That is, one mile is 1609.34 meters and then divide by 60 will give you 26.8224

So the expression  [SLength] / (3 * 26.8224)

is calculating the walk time if you can walk 3 miles an hour where the SLength happens to be in meters.

Jay Sandhu
New Contributor
Thank you very much for you answer.

Now i have next question for you.

Can i use tihis expession  [SLength]*60/3000 in this analyses

Where 3000 is pedestrian walks 3km/h

Best Regards

Alesger
by
Occasional Contributor III
yes, you can use speeds from 2.5 to 4 km/hr.  the 1 mile/hr seems to me is for a crowded area.

regards
Esri Regular Contributor
yes, you can use speeds from 2.5 to 4 km/hr.  the 1 mile/hr seems to me is for a crowded area.

regards

The previous expression was 3 miles per hour and NOT 1 mile per hour. Note it was multipled by 3.
Jay
Esri Regular Contributor
Thank you very much for you answer.

Now i have next question for you.

Can i use tihis expession  [SLength]*60/3000 in this analyses

Where 3000 is pedestrian walks 3km/h

Best Regards

Alesger

The expression is fine. But as Srirama pointed out, 3 Km / hour may be slow unless you know that is the speed at which your pedestrians are walking. Normal walking is 3 miles an hour or 4.8 Km per hour. So you could change the 3000 to 4800.

Jay Sandhu
New Contributor
Thanks a lot
Regards

Alesger