How to create Route Event Layer with Maps SDK for .NET?

KevinCheriyan — Wed, 19 Jul 2023 19:26:55 GMT

What I'm trying to solve:

I want to calculate the distance traversed along a line feature from a point that's on the line. The line features split and contain branches (think river stream) at irregular intervals. I want to solve this problem using .NET Maps SDK in .NET MAUI, using locally stored data from an MMPK. I have a network dataset that contains this data, so I can use the Network Analysis namespace.

Our client has a python script that uses arcpy to create a route event layer from a service area layer to perform this task. The route events that get created are the point locations that I'm trying to recreate in my .NET application.

What I have tried so far:

In this network dataset, I have point "facility" features and line "network" features. With this data, I have created ServiceAreaTask and I'm able to map ServiceAreaPolygons on the map. There is no equivalent of "Create Route Event Layer" in .NET Maps SDK, so I do a couple of things to achieve the same effect (or so I thought). First, I take the ServiceAreaPolygon, create a boundary around the polygon, and see where the line feature in question intersects with the polygon boundary. I figured that since the extent of the Service Area Polygon matches with the impedance cutoff, the boundary on the line should be where the event is.

Now, this works only ~ 50% of the time. ServiceAreaPolygons are created in what seems like, erratic and random places, in areas where there's no data. This gives me extra, incorrect point locations. In other cases, I also end up with less points than I should. Suffice it to say that what I am trying to mimic CreateRouteEventLayer does not work.

Anyone have any idea on what's really happening behind the scenes of CreateRouteEventsLayer that I can also de-construct and apply using .NET Maps SDK? I'm also looking into CreatePointAlong() method in GeometryEngine, which would work in some cases, but not all, I think. Not sure how it can handle branch-offs and splits in a polyline.

Thanks in advance!

topic How to create Route Event Layer with Maps SDK for .NET? in .NET Maps SDK Questions

How to create Route Event Layer with Maps SDK for .NET?