Thank you very much Michael, that's exactly what I needed, now can I continue coding :-)!
Just a last question, what is the correct version to obtain daily snapshots you mentioned? I was trying: <org.geotools.version>8-SNAPSHOT</org.geotools.version> and: <org.geotools.version>8.0-SNAPSHOT</org.geotools.version> ...but none of them worked for me. Do I have just wrong specified version or do I need different repository? <repository> <id>OSGEO GeoTools repo</id> <url>http://download.osgeo.org/webdav/geotools</url> </repository> Regards, Jiri On 07/27/2011 02:16 AM, Michael Bedward wrote: > Hi Jiri, > > You are using the most recent milestone release rather than the > snapshot (daily) version. That explains the spurious logging messages > which were fixed more recently. The vectorizing code hasn't changed > since the milestone release so you're not missing anything there. > > You won't need to union polygons, dissolve boundaries etc with the > polygons returned by RasterToVectorProcess. Since they are derived > from raster regions there will be no covering intersections or > adjacent polys with the same value. > > To gather the individual polygons from the feature collection and > create a MultiPolygon... > > SimpleFeatureIterator featureIter = fc.features(); > List<Polygon> polyList = new ArrayList<Polygon>(); > try { > while (featureIter.hasNext()) { > polyList.add((Polygon) > featureIter.next().getDefaultGeometry()); > } > } finally { > featureIter.close(); > } > > GeometryFactory gf = new GeometryFactory(); > MultiPolygon mp = gf.createMultiPolygon(polyList.toArray(new > Polygon[0])); > > If your input image has a value that you want to treat as outside / > nodata, you can specify this using the outsideValues arg of the > RasterToVectorProcess.process method to avoid creating polygons for > nodata regions. Alternatively you can just vectorize everything and > test the value of the "gridvalue" attribute in the feature collection. > For example... > > while (featureIter.hasNext()) { > SimpleFeature feature = featureIter.next(); > // skip polygons for outside value 0 > if (((Number) > feature.getAttribute("gridvalue")).intValue() == 0) { > polyList.add((Polygon) feature.getDefaultGeometry()); > } > } > > You could also something similar if you have a number of different > grid values and want to create a separate MultiPolygon for each. > > Michael > > On 27 July 2011 12:25, Jiří Novák<[email protected]> wrote: >> Hi Michael, >> >> thanks for leading me :) >> >> Also answering inlines... >> >> On 07/26/2011 11:19 PM, Michael Bedward wrote: >>> Hi Jiri, >>> >>> Please see my comments inline: >>> >>>> This is my code: >>>> >>>> FeatureCollection<SimpleFeatureType,SimpleFeature> collection = >>>> RasterToVectorProcess.process(cov, band, bounds, outsideValues, >>>> insideEdges, null); >>>> >>>> FeatureIterator<SimpleFeature> iterator = collection.features(); >>>> try { >>>> while( iterator.hasNext() ){ >>>> SimpleFeature feature = iterator.next(); >>>> >>>> System.out.println(feature.getDefaultGeometry().getClass()); >>>> } >>>> } >>>> finally { >>>> iterator.close(); >>>> } >>>> >>>> GeometryFactory gf = new GeometryFactory(); >>>> MultiPolygon mp = gf.createMultiPolygon( collection.toArray(new >>>> Polygon[0]) ); >>> Ah... I've given you a bum steer sorry. I hadn't ready your previous >>> email and was thinking you were using the JAITools operator with >>> Collection<Polygon> output. Sorry about that. >>> >>> The RasterToVectorProcess is giving you a SimpleFeatureCollection >>> where the Geometry type is Polygon. Do you want to convert each of >>> these to individual MultiPolygons or combine all of them into a single >>> MultiPolygon ? I just want to check so that I don't send you off in >>> the wrong direction again :) >>> >> I need to obtain just one MultiPolygon as the combination (dissolve/merge) >> of those in SimpleFeatureCollection. >>>> 1) many info logs about EPSG initialization - is there a way to get rid >>>> of >>>> it? E.g. set the geotools log level to warning? >>> Those log messages were recently changed to Level.FINE on trunk >>> (8.0-SNAPSHOT). Are you using the most recent binaries ? >>> >> I hope so, I am using this maven configuration: >> ... >> <!-- === Versions of used frameworks and libraries === --> >> <properties> >> ... >> <org.geotools.version>8.0-M1</org.geotools.version> >> ... >> </properties> >> >> <repositories> >> <repository> >> <id>OSGEO GeoTools repo</id> >> <url>http://download.osgeo.org/webdav/geotools</url> >> </repository> >> ... >> </repositories> >> >> Is the right repository for the latest artifacts? >> >> Jiri >>>> 3) And then it falls at line: "MultiPolygon mp = gf.createMultiPolygon( >>>> collection.toArray(new Polygon[0]) );" raising exception of incorrect >>>> storing (allthought the types seems to correspond). >>> That's because I told you to do the wrong thing. >>> >>> Michael >> ------------------------------------------------------------------------------ Got Input? Slashdot Needs You. Take our quick survey online. Come on, we don't ask for help often. 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