I want to retrieve the latitude and longitude of a location shown in google map route between two locations

Question

I have lat and long of some locations in JSON. I want to spot whether these locations are present in a route shown by google maps.

Welcome to Stack Overflow, please take a time to go through [the welcome tour](https://stackoverflow.com/tour) to know your way around here (and also to earn your first badge), read how to [create a Minimal, Complete, and Verifiable example](https://stackoverflow.com/help/mcve) and also check [How to Ask Good Questions](https://stackoverflow.com/help/how-to-ask) so you increase your chances to get feedback and useful answers. — Josef Adamcik, Jul 20 '17 at 10:25
https://www.tutorialspoint.com/android/android_google_maps.htm. See this tutorial on how to place markers on maps. — sandy, Jul 20 '17 at 11:21

score 0 · Answer 1 · answered Jul 21 '17 at 00:21

Here are the steps I'd consider to achieve the effect you want:

Query for a DirectionResponse https://developers.google.com/maps/documentation/directions/intro#DirectionsResponses
For each polyline of each step of each leg, test whether your locations are close to the line. For simplicity you can also use the overview_polyline. Unfortunately this is not simple to do out-of-the-box using the Maps API alone. Check this thread for inspiration on a manual implementation. Find a point in a polyline which is closest to a latlng
Alternatively, convert the polylines to GeoJSON, and process using a spatial library such as JSTS or Turf. E.g. the latter provides a pointOnLine function.

Just noticed that you're doing this on Android. In this case JTS https://github.com/locationtech/jts could be useful. In particular, I believe you can test for perpendicular distance to `LineSegment`s. — pscl, Jul 21 '17 at 00:33

1 Answers1