Zitat von Luca Sigfrido Percich <[EMAIL PROTECTED]>: > I think that topology cannot be simply geometry-based, it needs a > Feature model to work with, so that features can be related to each > other in a persistent way based on attributes.
Cannot follow here. Sorry. Probably it's me not understanding some important point of it, but when I thing about geometry, topology and features I see following schema: - Geometry cares about describing the ... well ... geometry (in mathematical sense) of a feature - There are validation rules that might apply to check, if, f.e. geometries are allowed to overlap etc. - Features hold the (or some) geomtry/-ies and attributes. When I think about attributes I have the "usual" attribute table in mind, which means that I speak of "user-defined" attributes, attributes that the user somehow attached to the geometries - nothing "geotools internal". Now, a topology whould combine the geometry (in mathematical sense) and some special rules into topological objects that would take care about validation and what is possible, without Features and attributes and such getting involved primarily. Features would work as above. In my understanding the (spatial?) "relation" of features to each other is managed in one central object (the "topology"?), which could maybe become incorporated into a FeatureCollection? A topology in the mathematical sense is just a collection of nodes, edges and faces, i.e. features (Just thinking loud.) > So if JTS has to provide a topology model, I think there might be two > possible solutions: ... My idea was simply that JTS provides the geometrical part of it (the "topology" and the topology primitives node, edge, face), and GeoTools would extend the primitives (or wrap them or whatever) to Features, i.e. add/manage attributes and all the other needed stuff. .. Guess I am looking at it from a much too simple point of view. :-( Matthias Basler [EMAIL PROTECTED] ---------------------------------------------------------------- This mail was sent through http://webmail.uni-jena.de ------------------------------------------------------- This SF.Net email is sponsored by: Power Architecture Resource Center: Free content, downloads, discussions, and more. http://solutions.newsforge.com/ibmarch.tmpl _______________________________________________ Geotools-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geotools-devel
