fencing from a collection of coordinates

[YEZ_1971]

Hi, i have a list of coordinates (lat/LON decimal format wgs84) and i would like to find the extremity or perimeter points, i.e. to find the point that will define a polygon ignoring the inner points.

Yossi

 

[oldbrewer]

define an approximate central position and plot each point as a radius from there, then use a macro to loop round 360 degrees - maybe every minute of arc, and store the biggest radii giving you what you want

 

[YEZ_1971]

this requires to plot first each set of points to find the approximate center, kind of missing the point
i assumed im not first one having this challenge...

 

[oldbrewer]

an xy scatter plot quick and dirty, guess the centre, keep running a macro with centre slightly repositioned - how accurate does your answer need to be....