topic Re: GPS Points Intersection with Buffer Polygons in ArcGIS JavaScript Maps SDK Questions

GPS Points Intersection with Buffer Polygons

saurabhgupta2 — Tue, 19 Jul 2016 13:52:56 GMT

I am trying to create a safety mechanism for rail employees. I have live feed of GPS coordinates of trains( for whole country) and 100 buffers. I need to trigger an alert if any of the GPS point enter into any of these buffer polygon. How I can approach this problem?

Thanks

Saurabh

Re: GPS Points Intersection with Buffer Polygons

RobertScheitlin__GISP — Tue, 19 Jul 2016 14:05:01 GMT

Saurabh,

I would start by merging all 100 buffers to one feature/geometry that way you can do a spatial query on each train gps point against the one polygon (merged buffers) each time you get new gps results.

Re: GPS Points Intersection with Buffer Polygons

SteveCole — Tue, 19 Jul 2016 15:01:52 GMT

I hate to go all ESRI sales person but this sounds like a perfect use scenario for the GeoEvent extension for ArcGIS Server. Short of that, I suppose you could incorporate a windows.setInterval based on some acceptable interval (1 minute? 30sec?) where you query the current location against the polygons in order to determine if you should warn the person of an approaching train.

Re: GPS Points Intersection with Buffer Polygons

saurabhgupta2 — Tue, 19 Jul 2016 16:59:32 GMT

Robert,

There are two hurdles i can see in the merging all the buffers and then intersecting one by one. First these buffers are independent identity ( represents locations for workers). The application needs to send the buffers ID along with intersecting GPS point ID as an Alert. If more than one instance of buffer is found then multiple pairs will be send. I am not sure merging will help me get different buffer ID and their intersecting GPS ID and more over GPS point will be in thousands and i need to generate simultaneous alerts. Iterating one by one wont solve the problem.

If some how i could interest all the buffer and gps point ( something like spatial joins in arcmap) that might solve the problem.

Re: GPS Points Intersection with Buffer Polygons

saurabhgupta2 — Tue, 19 Jul 2016 17:02:19 GMT

Steve

These buffer location will be at different locations and GPS points will be in thousands. Alerts should be simultaneous else it might be late for the concern person

Re: GPS Points Intersection with Buffer Polygons

RobertScheitlin__GISP — Tue, 19 Jul 2016 17:22:18 GMT

I would have to agree with Steve then the GeoEvent server sounds like the best match for your scenario.

Re: GPS Points Intersection with Buffer Polygons

KristianEkenes — Tue, 19 Jul 2016 21:08:36 GMT

I'm having a hard time picturing this. Are the buffers moving, or are they in fixed locations? I presume the GPS locations will be updating at a set interval. Once a GPS point intersects a buffer, you want to send an alert that indicates the GPS point ID and the buffer ID. Is that correct?

Re: GPS Points Intersection with Buffer Polygons

saurabhgupta2 — Wed, 20 Jul 2016 05:21:34 GMT

Kristian

Yes that's correct. But issue i am facing is that there can be many such intersection happening at the same time and alert has to be send for all such intersections simultaneously.

Thanks

Re: GPS Points Intersection with Buffer Polygons

saurabhgupta2 — Wed, 20 Jul 2016 05:23:37 GMT

Robert,

Can you please explain the same in bit detail, so that simultaneous alerts can be triggered for all such intersections.

Thanks

Re: GPS Points Intersection with Buffer Polygons

RobertScheitlin__GISP — Wed, 20 Jul 2016 12:43:58 GMT

Saurabh,

This is the type of stuff the GeoEvent server is designed for. You define GeoFences (your buffers) and when a trigger (your trains) intersect the GeoFence you can run some code. You need to look at product info about GeoEvent Server and search esris website as then has been several video and presentation about it.

Re: GPS Points Intersection with Buffer Polygons

saurabhgupta2 — Wed, 20 Jul 2016 13:08:30 GMT

Robert,

Thanks for the explanation. I will take a look to it. I have just one more question regarding the same. What is the most efficient way out to show real time GPS points on map. Currently I am creating the gps points graphics every 30 sec and adding to graphic layer( as right now i have 3 trains in my POC), but i fear if the number of gps locations( trains) will increase ( In actual scenario) then this approach wont be the best one. Can you suggest on the same.

Thanks

Re: GPS Points Intersection with Buffer Polygons

RobertScheitlin__GISP — Wed, 20 Jul 2016 13:15:54 GMT

This is what the GeoEvent server is designed for as well:

GeoEvent Extension | ArcGIS for Server

Re: GPS Points Intersection with Buffer Polygons

saurabhgupta2 — Thu, 21 Jul 2016 04:53:59 GMT

Robert,

Thanks . I will look into GeoEvent Extension

Saurabh