Because all US gates are within Terminal A, the union of the area specified by the domestic gates and the area of Terminal A is just Terminal A, as shown in the first row of the output. The second row shows the union of the coordinates of the international gates and all three terminals.
overlay_boundary | ref_boundary_name | overlay_flag | boundary_name | id |
---|---|---|---|---|
POLYGON ((0 0, 0 100, 100 100, 100 0, 0 0)) | Terminal A | 1 | US Gates | 1 |
POLYGON ((50 50, 50 150, 150 150, 150 100, 200 100, 200 0, 100 0, 100 50, 50 50)) | Terminal B | 1 | International Gates | 2 |