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Calculate number of roads/lines a line crosses

  1. Jun 18, 2014 #1
    Hi guys,

    I have a really tricky problem here and I'm hoping that there is a math guru here who can help.

    The problem

    Using Google maps, I need to allow a user to draw a line. This line can be in any direction and basically, I need to determine if the user has drawn the line over a road and if so, how many.

    Below is an example:
    The image doesn't seem to be showing so here is the link: http://postimg.org/image/iuj9e8jfj [Broken]

    With Google Directions service, I am able to get the nearest road of the dropped marker (markers indicated by arrow in image).

    For a single road, I believe that I can do this with Pythagoras, but for multiple roads by brain starts to boil.

    If anyone here could help, I'd really appreciate it. I appreciate it is pretty tough so I'm open to all suggestions.

    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Jun 18, 2014 #2


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    Gold Member

    I really don't understand what you want to do. Do you want to calculate he number of roads the line is intersecting?
  4. Jun 18, 2014 #3
    Yes, exactly that :)
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