How to know car is running on highway

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i'm starting to create a application map on android
so, it's use only on highway.
i don't know location(Longitude and latitude) which get by GPS on tablet with os android is on highway or normal street.
i have a solution, at highway gateway. i have use a flag to know is highway. But, the area is too small which to check the car at here with the deviations of GPS on smartphone or tablet of OS Android and speed's car(ex: area -30m, speed - 40km/h [so fast to check])
Please help me, what the solution can know the car on highway

Posted 30-Oct-13 16:34pm

dev C plus

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Ron Beyer · Answer 1 · 2013-10-30T16:43:00

Solution 1

Highways are line segments with widths, or in other words, rectangles. If you know the position and size of the rectangle you can determine where the car is.

You would need the geometry of the highway (which should be something like a number of points that form the line segments), you assign a width to them and do simple detection of a point inside that rectangle.

This is a pretty easy concept, but the hard part is that the rectangles are not cartesian aligned, but the world of game programming has a lot of algorithms for determining if a point is inside a rectangle (collision detection).

Posted 30-Oct-13 16:43pm

Ron Beyer

Updated 30-Oct-13 16:45pm

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dev C plus 30-Oct-13 22:56pm

Thanks to your idea
i have think about your idea
so, if i apply, database is so large which not best for the algorithms to find location on highway. i have tried develop with the a few rectangle at highway gateway, but deviations is large on tablet

i have get many rectangle for a highway, which is not best for database on tablet or smartphone

Ron Beyer 30-Oct-13 22:58pm

You don't get the geometry of the entire highway, just an area surrounding the vehicle. This narrows down your search significantly, and should be a pretty easy query in your database. BTW, there is a reason that most navigation systems (Android and iOS) are web based and use high powered servers to process the data...