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## gregmcc

1081 posts

Uber Geek

Subscriber

 Topic # 93382 19-Nov-2011 17:28 I have an irregular polygon in google earth (4 points) and would like to know if there is an easy way to figure out the centeroid

## Niel

3256 posts

Uber Geek

Trusted

 Reply # 547346 20-Nov-2011 07:17 I would divide it into 2 triangles and get the centeroid of each (middle of one side, 1/3 towards opposite corner). Then take a line between the two centroids, apply a mass at each end, and you have a simple equation of finding the center of gravity of that line. I'm an engineer, not a mathematician, so the above would be my starting point and then validate the method perhaps by dividing the area into different triangles. You can never have enough Volvos!

## Ouranos

68 posts

Master Geek

 Reply # 547347 20-Nov-2011 07:51 See the collection of tools at:  http://www.earthpoint.us/Shapes.aspx Copy and paste from Google Earth and it will calculate the centroid (along with other things).

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