Drive-time polygon creation

Hello,
I am new to Oracle spatial.
Has anyone successfully implemented drive-time polygon creation using
network data models ?
I am trying to build a drive-time network contains all streets in the United States.
Thanks,
Steven

Hello,
By "Drive-time polygon" do you mean something like an isochrone? i.e draw me a polygon that shows the area within 20 minutes driving time of location "X"?
The NDM (Network Data Model) contains a fairly rich Java API but I can't remember off the top of my head if this functionality is supported "out of the box" or not. Check the docs.... There is a "withinCost" function which sounds promising.
In my opinion you will struggle to load a fully detailed street network for the entire U.S into the NDM and then use the Java API (or PL/SQL API as this is based on the Java API) without problems. The limits to the amount of memory that can be allocated to a Java process effectively limit the size of the network that can be loaded.
Check out this thread re: the memory problems :
Re: Network Memory Object (PL/SQL)
If you can provide a "window" (MBR) to effectively cut down the area of interest then you may be OK.
If you want (for example) a list of zipcodes within N minutes of an individual zip code you may be better off buying in a pre-built "drive time matrix" which is just a table containing from zip, to zip & drive time and can be very quickly and easily queried....
Hope this helps,
Steve

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