Duplicate nodes in MapInfo Professional

[silver mapper]

I have created a polyline which I can best describe as two triangles
joined by a single line. I combined the initial polylines that I
plotted into one object. However, the application into which I have
exported the single object indentifies it as three objects. Upon
checking, I note that when I have the polyline selected, Layer
Control>Display>Show Nodes checked and the Reshape button clicked all
instances of two lines meeting display a yellow square, but the
instances of three lines meeting display a blue square, indicating
that I have duplicate nodes. This is borne out when I select a node
at that position and move it: the whole shape does not move, just on
line moves. How do I delete one of the two nodes so that the three
lines are connected or overcome the issue so that I do indeed have
only one object?

[Driver, Greg 9434]

Hi,

Have you tried converting the plines to regions and then running Clean Objects - Overlap removal? I think we've used this in the past and I've just tried it on a couple of regions and it seems to work. Don't forget, make a back-up copy of your table, just in case!

HTH

Greg Driver

System Administrator
Applications Support
ICT
Surrey Police
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[Tim Rideout]

Without seeing it, it is hard to be sure, but I think you have created
an invalid polygon, namely a self-intersecting polygon or 'bowtie'.
Select it and run Object>Clean and see what happens. I expect MapInfo
will break it up into a couple of polygons defined as a single region.

Whether duplicate modes all move together or not is controlled by the
Options>Preferences for the Map Window.

Tim

Dr Tim Rideout
Director

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