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Average of Polgons

TinaKwitkoski

I have been asked to find the Average area of 5 different wetland areas thru a 10 year period.

How would I do this. I have Arc Advanced license, and no idea how to figure this out.

Also the client wants and area that is 80% of the "merged" area. I have merged the 5 shapes, but how do I figure out 80% of this new polygon??

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Accepted answers

DanPatterson_Retired

as for the buffer by area and since you have greatly generalized the boundaries,

calculate the area of the generalized shape
do a negative buffer by a small amount
recalculate the area of the result
recalculate and repeat

I am sure there is an iterative buffer by area on GeoNet somewhere, the ones on the scripts site are more for point data

All comments

TinaKwitkoski

Thank you, I will try your suggestion..

Have a Great Friday

DanPatterson_Retired

as for the buffer by area and since you have greatly generalized the boundaries,

calculate the area of the generalized shape
do a negative buffer by a small amount
recalculate the area of the result
recalculate and repeat

I am sure there is an iterative buffer by area on GeoNet somewhere, the ones on the scripts site are more for point data

JakeSkinner

Hi Tina,

To find the average area you can use the Summary Statistics tool on the merged output. This will provide a table output. Another way is to open the attribute table of the merged output > right-click on the Shape.Area field > Statistics.

As for the 80% area, I'm not quite sure how to go about that.

TinaKwitkoski

these are the selected polygons,

and this is the Merge of them

TinaKwitkoski

this is what the client asked for..

We require an ‘average’ outline of the wetland, but more towards recent years. Perhaps make a union of all polygons and keep 80% overlap and toss out the outlier(s). Smooth out the polygon.

This is all the information I have besides the 5 polygon shapes I have

ChrisDonohue__GISP

So just to confirm, the goal is a polygon that represents 80% of the merged area? Were there any other parameters concerning how/where the 80% can be?

Chris Donohue, GISP

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