Hi Andrew,
The SQL Select syntax is:
select table1.IDcol , table2.IDcol , areaoverlap(table1.obj,table2.obj)
from table1,table2
where table1.obj intersects table2.obj
Note that the area returned will be in Mapinfo's current area units, so
you might want to set these by running the 'Set Area Units "sq km"'
statement in the MapBasic window beforehand.
To find proportion overlap, use the
proportionoverlap(table1.obj,table2.obj) function instead, but note that
the proportions returned will be those of the objects from the first
table listed in the function (table1).
Andrew
Andrew Tracey wrote:
I have two tables - 1 consisting of 70 polygons and 1 consisting of 20
polygons. Both tables cover the same area, what I want to do is work out what
area or percentage of each of the polygons that is within another.
Does anyone know the syntax to do this?
Thanks
Andrew Tracey
Information Support Officer (GIS)
Information Team
Chief Executive Office
South Tyneside Council
Westoe Road
South Shields
NE33 2RL
Tel: 0191 4247561
E-Mail : [EMAIL PROTECTED]
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