# Apportioning Points at a street intersection (arcgis or mapinfo)

I can't seem to find any evidence of this question, but I'm surprised by that, so pardon if this has been asked.

If one is mapping crime location reports, by XY coordinates to streets, to create "hot street" segments, how does ArcGIS handle intersections? Which street (the East/west or north/south) and/or which side of the street, gets counts of events at intersections?

Is there a default logic to this? Looking at my map some segments get both intersections, some get one, and they all go to east/west streets, not the perpendicular intersecting streets.

For the left/right (east/west) issue, where some segments get both intersections and some get one, my guess was it's based on a true north/south/east/west grid, and whether the intersection is to the east or west, but I can't figure out why the perpendicular streets don't seem to get intersection incidents.

Maybe a work around is having those counts be specific to the intersection and not to the line segment? But, I'm not sure how to do that.

Thanks for any help in understanding how the system apportions these counts.

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What method is being used to map the points? Is it heads up digizing, GPS, etc? ArcGIS doesn't really handle intersections, unless there is a point there. It will snap within a tolerance to the closest line or point. So, the first question is how are your points being created. The 2nd is what process do you want to use to assign points to lines? This is something that you have control over, using the Spatial join, with a near function, or within distance of, etc. Give an idea of your process so far, and where you want to end up. – Get Spatial Jul 13 '12 at 2:18
Thanks for the response. We are mapping XY coordinates assigned by our CAD system. When people input intersection name (main st & broad street) it puts the point wherever the CAD system has XY-ed that intersection. My main question is, once we've done this, there doesn't seem to be a systematic reason for why some incidents at intersections count in the total for the street segment to the left or right of the intersection, and never are counted on the street segments running north/south. Just curious if anyone knows how the system is deciding which street segment and if it can be controlled – Chris Fisher Jul 13 '12 at 13:15
I imagine you are spatially joining your points to the nearest street segment and then taking your stats from that? If so when you join you can set your tolerances so that it will join to the nearest street to the point. I also take it you are geocoding crime incidents and then joining. If so you can change options in the geocoder on where to drop points. – ed.hankins Sep 24 '15 at 18:02