Hello,

I have a question about calculating the mean of a polygon based on its area.

Let's assume a polygon ranging from 0-3 degree in latitude.

The area ratio is as below.

area of 0-1 degree => 25% of the total area

area of 1-2 degree => 25% of the total area

area of 2-3 degree => 50% of the total area

Please kindly advise if there is any tool

to obtain 2 degree in latitude, whose latitude line can cut the polygon into half based on area.

(ArcInfo 9.3 )

Thank you very much

I have a question about calculating the mean of a polygon based on its area.

Let's assume a polygon ranging from 0-3 degree in latitude.

The area ratio is as below.

area of 0-1 degree => 25% of the total area

area of 1-2 degree => 25% of the total area

area of 2-3 degree => 50% of the total area

Please kindly advise if there is any tool

to obtain 2 degree in latitude, whose latitude line can cut the polygon into half based on area.

(ArcInfo 9.3 )

Thank you very much

If you have the Spatial Analyst extension, you can try this approach:

1. convert the polygon to an arcinfo grid in geographic using a reasonably small cell size (maybe .01 degree).

2. Using the Multi-Output map Algebra tool, calculate a row map grid: "ddgrid = $$ROWMAP"

3. Use the Slice tool with the equal area option to divide ddgrid into two zones.