Christian Müller ha scritto: > Andrea, can we agree on 3 terms > 1) Vertical Generalization > Having multipe stuctural indentical features > 2) Horizonalt Generalization > Having mulitple geometry properties
Hmmm... I don't feel the need to make up terms for this, but if you'll use them, I'll know what you mean. > 3) Dynamic Generalization > Delegating the work to a backend (Btw, we have to include generalization > into jdbc-ng) We could, but we don't have to. I made some tests time ago and doing Douglas-Peuker on the fly generalization inside postgis, and it gave me no speedup (on the contrary, it was so slow that it made WMS rendering slower, with a PostGIS database sitting on the other side of a 100Mbit home network). That's why I'm pushing for the non topology preserving case too, it's the only generalization technique that could make on the fly, in database generalization worthwhile. > As you pointed out, we will need some config file (I would prefer XML). > Nevertheless I should be possible to read this config from anywhere > else. This was my idea with a " "GeneralizationFinder". The default > implementation should do the file stuff. > To tell the truth, until know I spent most of my time in geotools, so I > am completely new to the concept of the Catalog and the ResourcePool. > The data store wrapper sounds good ,but first,we should make a data > acess wrapper. I dont want to support modifications at this point in time. > If we implement this wrapper class, is there a need for DataStore > (DataAccess) and the correspoinding factory class ?. > As you see, I am quite uncertain about the starting point, the creation > of the wrapper object. First off we need to hear back from other devs as this would be a core modification in a very core class, then we'll decide how to handle this. Anyways, the two most promising routes seem to suggest the usage of a DataStore wrapper (whether we need a factory or not, it's up to how the hooking is made). Also, if the datastore wrapper is made in GeoServer you can limit yourself to a handful of methods (no need to worry about the reader/writer methods DataStore provides, GeoServer does not use them), and throw unsupported operation exceptions for the others. Finally, yes, it's ok if the pre-generalized data is returned read-only. Cheers Andrea -- Andrea Aime OpenGeo - http://opengeo.org Expert service straight from the developers. ------------------------------------------------------------------------------ _______________________________________________ Geotools-devel mailing list Geotools-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/geotools-devel
