WMS:Merging TINs

You can merge a selected TIN with another TIN using the Merge command in the TIN menu. This is particularly useful if you wish to merge a TIN generated from one program with a TIN derived from a background elevation source such as a DEM.

For example you may have surveyed data with a lot of detail for a part of your project (such as a roadway profile) and wish to combine that with a TIN derived from a DEM of the surrounding area.

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The following dialog is used to select existing TINs for merging. The merged TINs can be completed merged (all vertices combined and retriangulated), or you can specify to have vertices in overlapping regions deleted. You can delete old TINs if you wish, or keep them.

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The following rules are adhered to when merging a list of TINs:

• The TIN at the bottom of the list of TINs to merge has the highest priority, meaning that all of its triangle edges will be preserved while vertices that overlap from TINs higher in the list will be deleted.

• If a region being deleted from one TIN overlaps any stream vertices on the TIN being deleted, the stream will be split. The stream will be cutoff wherever it "enters" the TIN selected for merging and begin again upstream where it "exits."

• Drainage data will be lost and not transferred as part of the merged TIN.

Related Topics

• TIN Guidelines