Dear Professor,
According to ArcInfo's use of the universe polygon, it represents the area
beyond the outer boundary the user is studying. The universe polygon (also
known as the external polygon) will not have a label and the User-ID will be
zero (0). In a polygon attribute table (a .pat table in ArcInfo)the area of
the universe polygon is given as the negative sum of all polygons in the
coverage. In ArcInfo, records can be RESELECTed to perform calculations or
analysis on all records other than the universe polygon record. Essentially,
'selecting out' the universe polygon record and using all remaining records.
I hope others on the list will be able to provide more insight into the
MapInfo utility and how the error message is addressed. Since ArcInfo uses
topology to establish spatial relationships, is this (polygon)even required
in MapInfo?
Nilmini
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