Problems with erase/erase outside

[Warren Vick]

I've been trying to edit some region objects in a MapInfo table today using "erase" and "erase outside" and been having all sorts of problems. I've seen the occasional object processing glitch in Pro over the years and versions, but nothing quite as bizarre as this.

The problem is that when selecting a region, making it the target, then selecting a region in another layer which partially overlaps, then Objects->Erase..., the whole region (and row) disappears rather than just part of the object. The clipper and clippee are not particularly complex regions (1 polygon each, 80 nodes in one and a few hundred in the other). I've tried different machine in case my own PC had developed a glitch and even tried older versions of Pro in case it was a new bug introduced recently. Of most worry, is that Pro doesn't even seem to realised it's destroying a row incorrectly! Finally, I have checked the data for the usual nasties (self intersections, etc.) but both clipper and clippee look and test clean.

Anyone else seen anything like this? Any ideas?

Regards,
Warren Vick
Europa Technologies Ltd.
http://www.europa.uk.com

[ozz]

Walter 

I've had this issue sporadically over the last year or so I can't really nail down what's happening though.

Sent from my T-Mobile 4G LTE Device

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[Mike Osbourn]

Meant to type Warren… Geesh age and reading glasses are getting to me  J

 

I haven’t had this happen with version 12 yet !!  If I remember it only happened on polygons and not line work.

 

Mike

[Capt A]

I've had the same issue with certain objects from MI 7 all the way up to MI 12.5.  I've never been able to pinpoint the issue.

I ATTACHED AN EXAMPLE.  This polygon always gets deleted when you use Objects...Erase Outside and it does not matter what polygon you use to set the boundary around the object.  It also gets deleted when you try to use Objects...Clean.  Yet when you try to find the issue with Objects...Check Regions it comes up with no errors.

 You'd think by now someone at PB would have figured out the issue?

[Capt A]

BTW, the attached object is a single polygon that ran through a disaggregation....so that was not the issue either.

[Warren Vick]

I see this problem all the time and have always put it down to strange object geometry caused by a lot of manual/automated editing. PB will not like my solution... use FME (and I presume the UT will work) to export to Shapefile and bring it back to TAB.  Seems to fix it. However, be careful that the translation does not nudge your nodes a microscopic amount and ruin any edge matching you have with other tables.

 

Regards,

Warren Vick

Europa Technologies Ltd.

 

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[Bo Victor Thomsen]

Use the buffer function on the bad object with buffer size = 0. This will probably/maybe repair it

Regards
Bo Victor Thomsen
Aestas-GIS
Denmark

[Nick Lawrence]

I managed to solve this problem by adding a Bounds argument to the CoordSys Clause.

Use either the Bounds Manager in the Toolbox, or Mid/Mif out, add the Bounds in a text editor and Mid/Mif back in again.

Nick

[peter...@health.qld.gov.au]

A very old post I know, but this same thing just started happening to me with V15, and nearly drove me crazy until I dredged up this old post. Can confirm Nicks solution worked for me.

[Peter Horsbøll Møller]

Yeah, this issue can occur if you have different bounds.

 

This is a good read if you want to understand it better:

http://www.mapinfo.com/wp-content/uploads/2013/07/Focusing-in-on-Spatial-Precision-White-Paper.pdf

 

Peter Horsbøll Møller

Pitney Bowes

 

From: mapi...@googlegroups.com [mailto:mapi...@googlegroups.com] On Behalf Of peter...@health.qld.gov.au
Sent: 10. august 2016 06:27
To: MapInfo-L <mapi...@googlegroups.com>
Subject: [MI-L] Re: Problems with erase/erase outside

 

A very old post I know, but this same thing just started happening to me with V15, and nearly drove me crazy until I dredged up this old post. Can confirm Nicks solution worked for me.

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[Nicholas G Lawrence]

Arghhh… the abstract is all caps…. My eyes…..

 

From: mapi...@googlegroups.com [mailto:mapi...@googlegroups.com] On Behalf Of Peter Horsbøll Møller

Sent: Thursday, 11 August 2016 6:20 PM
To: mapi...@googlegroups.com

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