topic Re: How to detect a nearest co-ordinate from an array of co-ordinates ? in .NET Forum

How to detect a nearest co-ordinate from an array of co-ordinates ?

Anonymous — Fri, 19 Jul 2013 07:01:08 GMT

Hi all,

I have an array of co-ordinates (List A) from a polyline. I have one of the co-ordinate (B) from a polyline which is located around the array of co-ordinates of the other polyline (List A).

I want to detect the co-ordinate in List A which is closest to co-ordinate (B).

Known co-ordinates would be,

1. Array of co-ordinates

2. the reference co-ordinate.

Can anyone help ?

Re: How to detect a nearest co-ordinate from an array of co-ordinates ?

alberto_manero_geograma — Fri, 19 Jul 2013 12:25:30 GMT

If what wou need is to get the nearest vertex, you could loop through all vertex and get the lowest value of:

Math.Pow(vertex.X - coordinate.X, 2) + Math.Pow(vertex.Y - coordinate.Y, 2)

The lowest value indicates the nearest vertex.

But if you need the nearest point to the polyline, you could use the "GetClosestPointTo" method of the polyline.