Are there any formats that record "coverage" topology? What I'm worried about is when shapes are encoded as blob geometry with initially identical coordinates at shared vertices, is there any process that can validate or record that particular coords should have the same values even after reprojection or decomposition/rebuild?
I know how to do this in custom ways, I'm hoping to find some off-the-shelf process to at least refer to (I'm a bit pressed for time so I'm asking without doing the extra homework that's needed). I would build an indexer of the unique coordinates and how they relate to the blob geometries before and after and do checks there, but I don't know of an existing process that guarantees this. I understand that precision-setting is used to prevent numeric loss, but is there any formalization about that loss? (i.e. different instances of a vertex really do stay unique). I guess the result is going to be pretty good if you choose the precision appropriately and modifications aren't extreme? Thanks for consideration! Cheers, Mike -- Michael Sumner Software and Database Engineer Australian Antarctic Division Hobart, Australia e-mail: mdsum...@gmail.com
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