[Geotools-gt2-users] problems parsing coordinate reference system from gml2

[Georg W. <wal...@un...>]

Hi,

I'm trying to parse a gml2 Input and write it into a postgis database. 
Actually, the geometries are written into the database. Despite, the 
coordinatereferencesystem which is set to "null" parsing the gml input. 
I'm using gt-8.0-M0 but tried gt.2.7.2 as well:
Here's my code:


             GML gml = new GML(Version.GML2);
             SimpleFeatureIterator iter = null;
             ...
             iter = gml.decodeFeatureIterator(in);
             ...

             while( iter.hasNext() ){

                 feature = iter.next();

                 boundary =String.valueOf(feature.getDefaultGeometry());

                 try {
                         st.execute("INSERT INTO "+ this.areaTable 
+"(SELECT ST_GeomFromeWKT('"+boundary+"'));");
                } catch (SQLException e) {
                     // TODO Auto-generated catch block
                     e.printStackTrace();
                 }

         }

here is an example gml input:

...
<gml:featureMember>
<esdl:areatable_4326 fid="areatable_4326.fid--13a66ae6_131d31af140_1e03">
<esdl:population>0</esdl:population>
<esdl:boundary><gml:Polygon 
srsName="http://www.opengis.net/gml/srs/epsg.xml#4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates 
decimal="." cs="," ts=" ">9.77231662,53.54352298 9.77253859,53.54464077 
9.77310543,53.54778347 9.77359133,53.55005718 ...   
.9.79152979,53.53654956 9.78886511,53.53764245 9.77834135,53.54153606 
9.77327413,53.54288067 
9.77231662,53.54352298</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon>
</esdl:boundary>
</esdl:areatable_4326>
</gml:featureMember>
...

Actually, I'm able to parse all attributes and properties but the 
coordinatereferencesytem. It also works on different inputs the same 
way. I tried:

feature.getDefaultGeometryProperty().getDescriptor().getCoordinateReferenceSystem() 

feature.getType().getCoordinateReferenceSystem()

com.vividsolutions.jts.geom.Polygon polygon = 
(com.vividsolutions.jts.geom.Polygon)feature.getDefaultGeometry();
polygon.getSRID();

but they all return "null" as coordinate reference system although the 
geometries itself are inherited

Further the console prints some output which might lead to the solution 
of my problem but didn't really help me so far:

23.08.2011 10:55:59 
org.geotools.referencing.factory.epsg.ThreadedEpsgFactory <init>
INFO: Setting the EPSG factory 
org.geotools.referencing.factory.epsg.DefaultFactory to a 1800000ms timeout
23.08.2011 10:55:59 
org.geotools.referencing.factory.epsg.ThreadedEpsgFactory <init>
INFO: Setting the EPSG factory 
org.geotools.referencing.factory.epsg.ThreadedHsqlEpsgFactory to a 
1800000ms timeout
23.08.2011 10:55:59 
org.geotools.referencing.factory.epsg.ThreadedHsqlEpsgFactory 
createDataSource
INFO: Building new data source for 
org.geotools.referencing.factory.epsg.ThreadedHsqlEpsgFactory
23.08.2011 10:55:59 
org.geotools.referencing.factory.epsg.ThreadedHsqlEpsgFactory 
createBackingStore
INFO: Building backing store for 
org.geotools.referencing.factory.epsg.ThreadedHsqlEpsgFactory
23.08.2011 10:55:59 
org.geotools.referencing.factory.epsg.ThreadedHsqlEpsgFactory 
createBackingStore
INFO: Creating cached EPSG database version 7.5.0. This operation may 
take a few minutes...
23.08.2011 10:56:00 
org.geotools.referencing.factory.epsg.ThreadedEpsgFactory <init>
INFO: Setting the EPSG factory 
org.geotools.referencing.factory.epsg.DefaultFactory to a 1800000ms timeout
23.08.2011 10:56:00 
org.geotools.referencing.factory.epsg.ThreadedEpsgFactory <init>
INFO: Setting the EPSG factory 
org.geotools.referencing.factory.epsg.ThreadedHsqlEpsgFactory to a 
1800000ms timeout
23.08.2011 10:56:00 
org.geotools.referencing.factory.epsg.ThreadedEpsgFactory <init>
INFO: Setting the EPSG factory 
org.geotools.referencing.factory.epsg.DefaultFactory to a 1800000ms timeout
23.08.2011 10:56:00 
org.geotools.referencing.factory.epsg.ThreadedEpsgFactory <init>
INFO: Setting the EPSG factory 
org.geotools.referencing.factory.epsg.ThreadedHsqlEpsgFactory to a 
1800000ms timeout
23.08.2011 10:56:00 
org.geotools.referencing.factory.epsg.ThreadedEpsgFactory <init>
INFO: Setting the EPSG factory 
org.geotools.referencing.factory.epsg.DefaultFactory to a 1800000ms timeout
23.08.2011 10:56:00 
org.geotools.referencing.factory.epsg.ThreadedEpsgFactory <init>
INFO: Setting the EPSG factory 
org.geotools.referencing.factory.epsg.ThreadedHsqlEpsgFactory to a 
1800000ms timeout

What am I missing in my Code? Are there any further Classes and Methods 
I need to call?

Regards,

Georg

-- 
  Dipl. Geograph Georg Walenciak
     Chair of GIScience
     Department of Geography, University of Heidelberg

     wal...@un...
     http://giscience.uni-hd.de

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