Hey Greg Usually CRS is null for a shapefile read through shapefiledatastore if it doesn't have a corresponding .prj file
You may not need to use an AuthorityFactory in that case if u can provide a prj file Regards Ajay ravichandran On Jan 14, 2009, at 2:48 PM, Greg Ederer <[email protected]> wrote: > Hi, > > I found the answer to my own question: > > CRSAuthorityFactory factory = > ReferencingFactoryFinder.getCRSAuthorityFactory("EPSG", null); > CoordinateReferenceSystem crs = > factory.createCoordinateReferenceSystem("4326"); > > Thanks! > > Greg > > On Jan 14, 2009, at 12:40 PM, Greg Ederer wrote: > >> Hi, >> >> I am reading a shapefile using the following code from the User >> Guide: >> >> File file = new File("/Users/gregederer/servers/geoserver_data/data/ >> shapefiles/gaul/Africa/g2008_1.shp");//getShapeFile(args); >> >> ShapefileDataStore shapefile = new >> ShapefileDataStore(file.toURL()); >> String typeName = shapefile.getTypeNames()[0]; >> FeatureSource featureSource = shapefile.getFeatureSource(); >> FeatureType schema = featureSource.getSchema(); >> CoordinateReferenceSystem crs = >> schema.getGeometryDescriptor().getCoordinateReferenceSystem(); >> >> MapContext map = new DefaultMapContext(crs); >> Style style = createStyle(file, schema); >> map.addLayer(featureSource, style); >> >> showMap(map); >> >> in showMap(): >> >> final JMapPane mapPane = new JMapPane(new StreamingRenderer(), >> map); >> mapPane.setMapArea(map.getLayerBounds()); >> >> When I run this code against my shapefile, I get: >> >> Exception in thread "main" java.io.IOException: CRS of this map >> context is null. Unable to get bounds. >> at >> org >> .geotools. >> map.DefaultMapContext.getLayerBounds(DefaultMapContext.java: >> 544) >> at org.esv.SummaryStats.ShapeLab.showMap(ShapeLab.java:187) >> at org.esv.SummaryStats.ShapeLab.main(ShapeLab.java:75) >> >> Is it possible that this shapefile has no CRS? If so, is there a >> factory method that I can use to get the required >> CoordinateReferenceSystem reference? I happen to know that this >> particular shapefile is in ESPG:4326. What other parameters will I >> need? >> >> Thanks! >> >> Greg >> >> --- >> --- >> --- >> --------------------------------------------------------------------- >> This SF.net email is sponsored by: >> SourcForge Community >> SourceForge wants to tell your story. >> http://p.sf.net/sfu/sf-spreadtheword >> _______________________________________________ >> Geotools-gt2-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users > > > --- > --- > --- > --------------------------------------------------------------------- > This SF.net email is sponsored by: > SourcForge Community > SourceForge wants to tell your story. > http://p.sf.net/sfu/sf-spreadtheword > _______________________________________________ > Geotools-gt2-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users ------------------------------------------------------------------------------ This SF.net email is sponsored by: SourcForge Community SourceForge wants to tell your story. http://p.sf.net/sfu/sf-spreadtheword _______________________________________________ Geotools-gt2-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
