Steve,
In this case, I don't think your advice will do anything. The Clean
operation actually does an OVERLAY_NODES operation as part of the
processing. So doing this extra step will do nothing.
The Clean operation should be designed so that if one object is completely
within another, then the smaller object should survive the clean operation
and a hole should be punched into the larger object. There is a chance
that something is going wrong with this, and the smaller object is not
surviving the process, which could eliminate the row. If there are 2
objects that exactly overlap and cover excatly the same space, one will be
eliminated in the overlap elimination process. But, baring this, it is hard
to say what may be happening without further investigation.
Derek Snyder
MapInfo Corporation
Mail List:
[EMAIL PROTECTED]
From: on 08/04/2004 11:10 AM AST
To: Neil Gibson <[EMAIL PROTECTED]>,
[EMAIL PROTECTED]
cc:
Subject: RE: MI-L Objects> Check regions, and objects> clean problem
Here's a little trick that might help you with most of the errors.
1) Make layer editable
2) Select all objects
3) Set as target
4) Select all objects (again)
5) Execute OBJECT > OVERLAY_NODES from the menu
This has the effect of deleting any duplicate identical nodes in your
objects. Often times those overlaps are what cause the problem. Also, this
WILL NOT change actual shape of your objects, like clean may. If you have
many spatial errors in a polygon (self-intersecting lines, gaps, overlaps,
etc), even Overlay Nodes can cause a record to vanish, so inspect your
resulting data.
Hope this helps,
-- Steve
-----Original Message-----
From: Neil Gibson [mailto:[EMAIL PROTECTED]
Sent: Wednesday, August 04, 2004 10:52 AM
To: [EMAIL PROTECTED]
Subject: MI-L Objects> Check regions, and objects> clean problem
Hi. I am having a bit of trouble with MapInfo 7, build 26, and was
wondering
if any of you could help? When i run the objects> check regions, I get 322
overlays and gaps from 11525 rows. However, when I try objects> clean, it
wipes half of the rows off from the map. Is there any way of removing
these
overlays and gaps without ruining my map?
Cheers
Neil
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