I wanted to pass this along and send a thank you to Kristen. I would love for someone to create a network dataset for all of LA County – it would be a valuable resource:
I did some researching and found a way where I could acquire roadway data and assemble it into a network dataset for route analysis in ArcMap.
The process mainly involved downloading the Open Street Map data and using the program, “Open Street Map to Network Dataset” (OSM2NDS). Users of OSM’s website are limited in how many nodes that can download from the OSM website at a time. As a work around, I downloaded segments of the entire geography I was interested in, converted the OSM files to network datasets, and then appended the source files of the network datasets into a larger files and rebuilt the network dataset using the specifications of the network datasets created by OSM2NDS.
You can download OSM2NDS at this location:
And the OSM to Network Dataset conversion program is open source.
If you haven’t caught wind of this, feel free to pass this along to your colleagues.