VERIFIED SOLUTION i

How to calculate the proportion of a polygon that falls within another polygon in MapInfo Pro

Here is a mapper with 2 tables of overlapping region objects.:

User-added image

 
The proportionoverlap()  function can be used to create a new table with the proportion / percentage  of each polygon that fell within each county polygon.

User-added image

This will output a browser with the county name and along with the polygon ID and the proportion that fell within each county.

User-added image


 

 
Environment Details
UPDATED:  August 17, 2017