Divide vector of coordinates into even intervals.

Hi!

I have a long vector of longitude and latitude coordinates representing one bus route. Though the distance between each following pair of coordinates is different through the vector. I want to generate new longitude-latitude coordinates so that I have lots of intervals with same length.

Answer 1

[Jim Riggs]

Based on your description of the problem, this is what I would do:

Given a vector of lat/lon positions which represents one route, where the distance between points is not evenly spaced. I want to divide this route into N evenly spaced distances.

In order to interpolate on distance, you need to create the distance vector that corresponds to the lat/long vector. Compute the distance from the start of the route for each lat/lon point. E.g. d1 = zero, d2 = the distance from pt1 to pt2. d3 = d2 + distance from pt2 to pt3, etc. This vector is monotonically increasing from zero to the total route length.

Now you interpolate the total distance vector based on your desired distance spacing, then use that to locate the corresponding position in the lat/lon vector. The corresponding point will be bounded by the same index values, and have the same fraction displacement between the bounding values.

[Hampus Alfredsson]

Yes, I managed to solve the problem by interpolation and some if-restrictions for certain intervals. Thank you

Answer 2

[KSSV]

You need to have a look on interpolation......Read about interp1.

[Hampus Alfredsson]

Yes, interpolation works to begin with. But whenever the direction of coordinates become negative(the bus is driving on a road that is slightly back towards its starting point), the interp1 become wrong.

[Stephen23]

@Hampus Alfredsson: interpolation works with negative values just as well as it does positive ones. Please make a new comment and upload your code by clicking the paperclip button.