Zitat von Zheng Xudong <[email protected]>: > I tried the PreGeneralized following the two link, but I encounter two odd > problems: > > 1. I found the pregeneralized shapefile is still the same size with the > original, no matter which distance I set. Why? Does it means the > pregeneralization method is not suitable for my shapefile?
Install the gdal utilities from www.gdal.org. Use ogrinfo -al -geom=SUMMARY xxx.shp to get detailed info. > > 2. When I tried to load the pregereralized shapefile following the code in > http://docs.geotools.org/**latest/userguide/library/data/** > pregeneralized.html<http://docs.geotools.org/latest/userguide/library/data/pregeneralized.html>, > like: > > > Repository repo = new RepositoryDSFinder(); > GeneralizationInfosProvider provider = new GeneralizationInfosProviderImpl(); > GeneralizationInfos infos = null; > try { > infos = provider.getGeneralizationInfos("map_info.xml"); > } catch (IOException e) { > e.printStackTrace(); > } > DataStore ds = new PreGeneralizedDataStore(infos,repo) > FeatureSource<SimpleFeatureType, SimpleFeature> fs = > ds.getFeatureSource("XXX") > > and the map_info.xml is like: > > <?xml version="1.0" encoding="UTF-8"?> > <GeneralizationInfos version="1.0"> > <GeneralizationInfo dataSourceName="file:XXX.shp" featureName="XXX" > baseFeatureName="XXX" geomPropertyName="the_geom"> This should be something lime <GeneralizationInfo dataSourceName="file:XXX.shp" featureName="YYY" baseFeatureName="XXX" geomPropertyName="the_geom"> YYY is the name you have to use when drawing. > <Generalization dataSourceName="file:map/5.0/XXX.shp" distance="5" > featureName="XXX" geomPropertyName="the_geom"/> > <Generalization dataSourceName="file:map/10.0/XXX.shp" > distance="10" featureName="XXX" geomPropertyName="the_geom"/> > <Generalization dataSourceName="file:map/20.0/XXX.shp" > distance="20" featureName="XXX" geomPropertyName="the_geom"/> > </GeneralizationInfo> > </GeneralizationInfos> > > the "XXX" is the filename of my shapefile. > > But when I invoke *fs.getSchema()*, it prompt "No such type : XXX". I > suspect whether the featureName is set wrong, but I don't know how could I > get the featureName or baseFeatureName in my shapefile. Again, orginfo is your friend. > > > On Mon, Feb 27, 2012 at 11:42 PM, <[email protected]> wrote: > >> You can use >> http://docs.geotools.org/**latest/userguide/library/data/** >> pregeneralized.html<http://docs.geotools.org/latest/userguide/library/data/pregeneralized.html> >> >> A tutorial using shape files is here >> http://docs.geoserver.org/1.7.**5/user/tutorials/feature-** >> pregeneralized/feature-**pregeneralized_tutorial.html<http://docs.geoserver.org/1.7.5/user/tutorials/feature-pregeneralized/feature-pregeneralized_tutorial.html> >> >> I would recommend using a spatial database like postgis, using shape files >> has the disadvantage of duplicating all non geometry attributes for each >> level. >> >> Christian >> >> >> Zitat von Zheng Xudong <[email protected]>: >> >> >> Hi all, >>> >>> I use GeoTools 8.0M4 to load a shapefile contains about 10,000+ >>> geometries (each is a multiline). The code is just like the demo in >>> quickstart. But I found the rendering is a little slow, especially when I >>> zoom in/out or drag the map, and even sometimes the rendering couldn't >>> completed (leave some blank area). What can I do to optimize the >>> performance of rendering, or the demo is already the best solution? The >>> CPU >>> of my PC is Core Duo E6550, the memory is 2G, and the graphics card is ATI >>> Radeon HD 2400. >>> >>> Thanks and best regards! >>> >>> -- >>> Zheng Xudong >>> State Key Laboratory of Software Development Environment >>> School of Computer Science and Engineer, BeiHang University >>> >>> >> >> >> ------------------------------**------------------------------**---- >> This message was sent using IMP, the Internet Messaging Program. >> >> >> -- > Zheng Xudong > State Key Laboratory of Software Development Environment > School of Computer Science and Engineer, BeiHang University > ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program. ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ GeoTools-GT2-Users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
