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Do you need to care? I looked at CreateTopoGeom documentation. If PostGIs cares about the order, then they will take care of it. Oracle Spatial is very picky about the order of the points in a line and the rings. If you run the function on the data that you have, and if you display that data baring any SRID conversion issues, then you should be good to go


Instead of cutting out polygons, an alternative is to reshape your polygon (Toggle editing > Edit > Reshape Features) into your desired corridor. The topology should remain intact as no polygons are being removed.


If you have access to ArcGIS 10.2 for Desktop, or possibly earlier, then I think the Polygon Neighbors (Analysis) tool which: Creates a table with statistics based on polygon contiguity (overlaps, coincident edges, or nodes). may make this task much easier now.


That would be an awesome feature! Unfortunately I don't think it's possible. Your best bet is to probably use the v.clean tool from GRASS to automate the fixing of errors. There's a number of cleaning functions available within the v.clean tool such as: Break: Breaks lines at each intersection snap: Snaps lines to vertex in threshold rmdangle: Removes ...

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