removing duplicate lines

[Mel King]

Hi all
Does anybody know how to remove duplicate lines? I found the MI tool
to remove duplicate records and also a post on how to remove duplicate
points but nothing on lines.
Thanks

[Mats Elfström]

Hi Mel!

 

Please define duplicate lines.

 

Regards, Mats.E

2010/1/25 Mel King <mk...@unidel.com.au>

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[CDR Group]

Hello Mel

 

If you find a duplicate - how do you know which one to delete?

Which is the correct one?

 

John Ievers

CDR Group
www.cdrgroup.co.uk
www.puredotnet.co.uk
Tel: 01433 621282
Fax: 01433 621292
Specialists in Geographic Information Systems

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[MapInfo-L]

Hi John

 

If they are genuine duplicates ( identical geometry and attributes and on the same layer ) I guess it does not matter which one(s) you remove - as long as only one is left after. Its just like not wanting duplicate TOIDS in MasterMap.

 

A spatial solution with MapBasic would be to step through the TAB file record by record - get the records from the same layer in the MBR of the current record - and then with these records test for coincidence and attribution match - removing exact matches of current records. On moving to a record test ot is not deleted and if not repeat. At end pack table. There is perhaps a faster way - but this program could be refined to include or exclude based on other factors like attribution, colour line width etc etc.

 

I do not know of a utility to do this but there must be one out there ??

 

Regards

 

Bob

[Driver, Greg 9434]

You could try SKIMALL -

 

http://www.paris-pc-gis.com/ppcc/moreskimall.htm

 

"Skimall finds records that are judged identical on the basis of a strategy chosen by the user"

 

HTH

Greg Driver

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[Cinda Graubard]

If you have Discover, the really great topology tool called Polybuilder will find, identify and remove duplicate lines.

Cinda Graubard
GeoMax

[smaps]

If you have identical duplicates (that, only one line is visible)in
the same layer,

Make the layer editable

Select All objects in the layer
(note: When you "select all" identical duplicates, selection
"Highlight" become invisible )

Go to > Objects > Snap/Thin....

Check "Enable Node Thinning/Generalization"
Give Values 0, 0 for both "3-Node Collinear Deviation" and "Node
Separation"

Click OK

Hope This works(Do backup your data before your first try)

Regards
Srk Nair
http://www.gis.maphics.com

[smaps]

Make the layer editable

Go to > Objects > Snap/Thin....

Click OK