Latest Contributions by justinhampton

‎09-11-2012

Jay, thank you very much for your help. I'll begin using the supplied street files.

‎09-10-2012

Can someone confirm for me if Network Analyst recognizes that not all intersecting streets are actually intersections. For example, streets with bridges? I am referring specifically to the TIGER lkA street files. I do not see any type of identifier that would include elevation in the table. If NA does treat overlapping streets as intersections, what approaches can be taken to ensure that the routes are not generated requiring these impossible routes?

‎09-10-2012

Thanks for this advice Jay. I use a similar approach, using Hawth's tools to create a 1000' grid equal to my city boundaries shapefile to develop candidate locations. It sounds like your suggestion is to continue with that approach, but then snap to roads, excluding those roads that are not feasible for the location - like a highway, or onramp. That's a great idea. Thank you.

‎09-06-2012

I am attempting to determine an optimal station location for a fire station using the maximize coverage setting. I typically set a point grid every with 1000 foot spacing to load into the facilities points for my potential station locations. On this last model I ran, it placed a station in the "clover leaf" of a 2-highway intersection. While this makes perfect sense from a pure street network standpoint, its not feasible. How do you guys manage this kind of issue, apart from going through each facility loaded and removing those that don't make sense. In my case, this wouldn't really be feasible. thx for any thoughts!

‎02-15-2012

I am trying to identify the minimum number of stations using the Location-Allocation minimize stations function. I have 710 potential locations and roughly 40,000 demand points. Based on the street speed limits, and the size of the area, I believe that all of the demand points could be reached by 7-9 stations within 4 minutes, and 4-5 stations in 8 minutes (just eyeballing it based on previous service area maps). However, when I run the minimize facilities problem type using a 4 minute impedance in the location allocation tool, the results show approximately 21 stations, and many are within a thousand feet of each other. There are only two settings: the impedance cut-off (I'm using 4) and the impedance transformation (I'm using linear), am I doing this incorrectly? Any advice would be much appreciated, I've been working on this for a couple of days with much aggravation.

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Latest Contributions by justinhampton

Re: overlapping streets that are not intersections, but are treated as such by NA

overlapping streets that are not intersections, but are treated as such by NA

SOLVED: How do you reduce the number of unrealistic facility locations using loc/all

How do you reduce the number of unrealistic facility locations when using loc/alloc?

Location Allocation (minimize facilities) providing strange results