Hello,
I am attempting to perform a Service Area analysis and am getting unexpected results. I am running the analysis using the detailed polygon generation. My issue is that there are a significant number of holes being generated in the service area results. To test these anomolies, I've run a simple routing problem to verify whether or not these "holes" are routable. In each instance, the routing problem is solved without issue. In the screenshot below, you can see the hole in the service area analysis. The turquoise line is the result of a routing problem. It solved correctly and the cumulative time indicates the entire hole in the service are polygon should be green (<5min drive time.)
I'm sure there is a setting that I am missing, but I've tried everything I can think of. I'd prefer to not user the generalized polygon generation setting, as the results negated a few pockets of "hard to reach" streets.
Any thoughts would be greatly appreciated.
Shaun
ArcGIS Desktop 10.2.2
Windows 7 64bit
Enterprise Geodatabase - SQL Server 2008 R2
I don't have an answer except to say that those holes in polygons have always appeared with network analyst; they've never been explained to me.
It looks like you are using NA to develop response zones for fire/ems, which is what I've used it for as well. As long as your network has connectivity to to the islands, and the drive times are not exceeded [by too much] I wouldn't sweat it.There may be the off chance that the last segment traversed does in fact exceed the conditions, for example you have the speed limit erroneously set at 0 instead of 25; check those sorts of things out to be sure.