This is called the action of the GIS tools to eliminate vector inconsistencies to the norms commonly accepted in the Spatial topology. Each tool has implemented them in its own way, let's see the case of Bentley Map and Manifold GIS.
Microstation includes two tools for the same, one activated by keyin (dialog cleanup) and the other known as topology Cleanup. For reasons of dispersion, we all prefer the former, although there is no more button for this than the old command.
It includes six topological options in the left frame, while in the lower part there are the tolerances and to the right the destination and characteristics where the indications of inconsistency are expected. Although it is called topological cleaning, it is not the most appropriate name, rather they are vector cleaning tools among which includes:
- Duplicate elements
- Related Items
- Thin, little was used but it is to determine the abuse of vertices unnecessarily
- Loose elements
For almost every one there was the alternative of choosing the destination of the error, option to mark it or eliminate it and tolerances. It was not bad, there were even the mrf tools compiled with mdl that allowed to navigate through the errors. But it used to be a headache whatever it was, not because of cleanliness that was sharp but with later utility in spatial or topological analysis. To give an example, in layers of different maps, there was a problem with the non-coincidence of nodes, a madness.
The penel changed with Bentley Map, there is always the Dialog Cleanup Although it requires having a project open, but the other alternative was concentrated on a single tabbed panel. Additionally, very functional options were added:
- View filter control
- You can filter the type of objects (line, arc, polyline etc)
- The match can include line type, color or thickness
- Create automatic file backup
- Overlap can bypass duplicates
- The configuration can be saved as a .rsc file and recalled
- Thin was removed, that nobody used because it did not work
It would be necessary to prove if the headache is improved with the topological analysis, because it was too rigorous and demanded accuracy of joints too crazy with which the tolerances did not make sense. Alert flags are also non-dynamic vector objects, which makes much of the work become a visual skill rather than a cell of dynamic size.
Bentley must work hard on the subject, because although Bentley Map Supports topologies, is half taken from the hair. Additionally it does not support easily complex geometries, which perhaps do not occur much in the cadastre but in other layers such as vegetation cover or risk areas, to put a couple of examples. In Geographics it turned them into Cells or complex shapes, So that you could not Do topological analysis. It should simplify the process, because most programs have made great strides in this, for example, using the Scullion Manifold GIS does an exceptional job without complicating much. This works with Tools / topology factory, Just select the objects and lift a panel that includes an immediate analysis according to the precisions of the layer:
- Contiguous branches
- Reduntant metrics
Besides, with selecting them they are shown in different colors and there is the option of individual or massive self-repair. Make change tolerance, this is also within a view with options to move, go to the next, take action and approach.
Finally the user adapts to suffer or mix tools, but should not be accepted practice for a service that we pay and hope to improve over time.