[Proj4j] Conversion issue
P. Peterse (HDB)
p.peterse at han-dataport.nl
Mon Oct 22 06:36:27 PDT 2012
Hello Gertjan,
I'm also not an multithreading expert. But I've changed the Proj4j code to:
public synchronized static Set supportedParameters()
and I didn't see the error anymore. Any false parameter gives an exception.
Regards,
Peter
Op 22-10-2012 13:23, Gertjan Idema schreef:
> On Mon, 2012-10-22 at 12:31 +0200, P. Peterse (HDB) wrote:
>> Martin,
>>
>> can it be that the class Proj4Keyword also need to be synchronized?
>>
> Did you try running the code without the 'towgs84' parameter? If you
> get the same error, but for the 'proj' parameter, that would support
> the theory that your dealing with a synchronization problem.
> 'towgs84' just happens to be the first parameter to be checked. The
> next would be 'proj', at least on my JVM.
>
> In this case, I think the Proj4Keyword.supportedParameters() method
> should be synchronized, but I'm not really a multithreading expert.
>
> Groeten, Gertjan
>
>> Regards,
>> Peter
>>
>> Op 22-10-2012 11:55, P. Peterse (HDB) schreef:
>> > Hello Martin,
>> >
>> > I updated the proj4j package and using this library in our project.
>> >
>> > unfortunately the error still exists:
>> > ============
>> > towgs84 parameter is not supported
>> > org.osgeo.proj4j.UnsupportedParameterException: towgs84 parameter is not
>> > supported
>> > at
>> > org.osgeo.proj4j.parser.Proj4Keyword.checkUnsupported(Proj4Keyword.java:108)
>> > at
>> > org.osgeo.proj4j.parser.Proj4Keyword.checkUnsupported(Proj4Keyword.java:115)
>> > at org.osgeo.proj4j.parser.Proj4Parser.parse(Proj4Parser.java:34)
>> > at org.osgeo.proj4j.CRSFactory.createFromParameters(CRSFactory.java:120)
>> > at org.osgeo.proj4j.CRSFactory.createFromParameters(CRSFactory.java:98)
>> > at com.hdb.tol.wms.RDConverter.convert2WGS84(RDConverter.java:114)
>> > ============
>> > Is this an other issue with an other race condition?
>> >
>> > One of your questions was:
>> >
>> > Are you using the codein a multithreaded context?
>> >
>> > This is true, our project is using multiple threads.
>> >
>> > Regards,
>> > Peter
>> >
>> > Op 22-10-2012 9:47, P. Peterse (HDB) schreef:
>> >> Hello Martin,
>> >>
>> >> I've just update the proj4j code. And start trying it in our code.
>> >> I will let you now if it will work.
>> >>
>> >> Thanks for digging in to the code.
>> >>
>> >> Regards,
>> >> Peter
>> >>
>> >> Op 19-10-2012 19:52, Martin Davis schreef:
>> >>> I just committed a patch to the Registry which should avoid potential
>> >>> race conditions during initialization.
>> >>>
>> >>> Also, the idea about conflicting JARs is a good thing to look at too.
>> >>> Ah, the joys of Java classloaders...
>> >>>
>> >>> On 10/19/2012 8:36 AM, Martin Davis wrote:
>> >>>> Not sure why this would be a transient error. Are you using the code
>> >>>> in a multithreaded context? It's possible there's a race condition in
>> >>>> the Registry initialization. If you can recompile the code, try
>> >>>> changing the initialize method in Registry.java to:
>> >>>>
>> >>>> private synchronized void initialize() {
>> >>>>
>> >>>> M
>> >>>>
>> >>>> On Fri, Oct 19, 2012 at 6:14 AM, P. Peterse (HDB)
>> >>>> <p.peterse at han-dataport.nl <mailto:p.peterse at han-dataport.nl>> wrote:
>> >>>>> Hello,
>> >>>>>
>> >>>>> here is the stack trace from my code:
>> >>>>> ===============
>> >>>>> org.osgeo.proj4j.InvalidValueException: Unknown projection: sterea
>> >>>>> at
>> >>>>> org.osgeo.proj4j.parser.Proj4Parser.parseProjection(Proj4Parser.java:71)
>> >>>>>
>> >>>>> at org.osgeo.proj4j.parser.Proj4Parser.parse(Proj4Parser.java:43)
>> >>>>> at
>> >>>>> org.osgeo.proj4j.CRSFactory.createFromParameters(CRSFactory.java:120)
>> >>>>> at
>> >>>>> org.osgeo.proj4j.CRSFactory.createFromParameters(CRSFactory.java:98)
>> >>>>> at com.hdb.tol.wms.RDConverter.convert2WGS84(RDConverter.java:114)
>> >>>>> ===============
>> >>>>>
>> >>>>> What can I check?
>> >>>>>
>> >>>>> Thanks for any reply.
>> >>>>> Peter
>> >>>>>
>> >>>>> Op 19-10-2012 10:40, P. Peterse (HDB) schreef:
>> >>>>>> Hello Martin,
>> >>>>>>
>> >>>>>> It looks indeed that it's an initialisation issue. We are trying to
>> >>>>>> trace the bug and for now we suspect that the issue is in the class
>> >>>>>> Proj4Keyword
>> >>>>>> This method checkUnsupported is throwing the error. The code thinks
>> >>>>>> one
>> >>>>>> of the params is not supported.
>> >>>>>>
>> >>>>>> If we find a sollution we will send it.
>> >>>>>>
>> >>>>>> Regards,
>> >>>>>> Peter Peterse
>> >>>>>>
>> >>>>>>
>> >>>>>> Op 17-10-2012 18:27, Martin Davis schreef:
>> >>>>>>> I just tried this as well, and the code works fine for me. But if
>> >>>>>>> the
>> >>>>>>> problem is some kind of transient intialization error it's probably
>> >>>>>>> not going to show up in simple one-off tests.
>> >>>>>>>
>> >>>>>>> All I can suggest is to try and see if you can catch the problem in a
>> >>>>>>> debug session, and then have a look at why it might be occurring.
>> >>>>>>>
>> >>>>>>> Nice to see Proj4J is getting used!
>> >>>>>>>
>> >>>>>>> Martin
>> >>>>>>>
>> >>>>>>> On Wed, Oct 17, 2012 at 3:10 AM, P. Peterse (HDB)
>> >>>>>>> <p.peterse at han-dataport.nl <mailto:p.peterse at han-dataport.nl>> wrote:
>> >>>>>>>> Hello list,
>> >>>>>>>>
>> >>>>>>>> We are using org.osgeo.proj4j in our project and facing sometimes an
>> >>>>>>>> issue while transforming an coordinate from lat/long format to
>> >>>>>>>> EPSG:28992.
>> >>>>>>>> Most times the conversion will work ok, but sometimes there comes an
>> >>>>>>>> exception:
>> >>>>>>>> towgs84 parameter is not supported
>> >>>>>>>> The input coordinate is:
>> >>>>>>>> LatLon[lat=52.11882666666666, lon=5.04316]
>> >>>>>>>>
>> >>>>>>>> The used code is as follows:
>> >>>>>>>> ===============
>> >>>>>>>> CRSFactory csFactory = new CRSFactory();
>> >>>>>>>> final String EPSG28992_PARAM = "+proj=sterea
>> >>>>>>>> +lat_0=52.15616055555555 +lon_0=5.38763888888889 +k=0.9999079
>> >>>>>>>> +x_0=155000 +y_0=463000 +ellps=bessel
>> >>>>>>>> +towgs84=565.417,50.3319,465.552,-0.398957,0.343988,-1.8774,4.0725
>> >>>>>>>> +units=m +no_defs";
>> >>>>>>>> CoordinateReferenceSystem epsg28992 =
>> >>>>>>>> csFactory.createFromParameters("EPSG:28992", EPSG28992_PARAM);
>> >>>>>>>>
>> >>>>>>>> final String WGS84_PARAM = "+title=long/lat:WGS84
>> >>>>>>>> +proj=longlat
>> >>>>>>>> +ellps=WGS84 +datum=WGS84 +units=degrees";
>> >>>>>>>> CoordinateReferenceSystem epsg4326 =
>> >>>>>>>> csFactory.createFromParameters("WGS84",WGS84_PARAM);
>> >>>>>>>>
>> >>>>>>>> CoordinateTransformFactory ctFactory = new
>> >>>>>>>> CoordinateTransformFactory();
>> >>>>>>>> CoordinateTransform trans =
>> >>>>>>>> ctFactory.createTransform(epsg4326,
>> >>>>>>>> epsg28992);
>> >>>>>>>> ProjCoordinate inCoord = new ProjCoordinate();
>> >>>>>>>> ProjCoordinate outCoord = new ProjCoordinate();
>> >>>>>>>> inCoord.y = pos.getLat();
>> >>>>>>>> inCoord.x = pos.getLon();
>> >>>>>>>> //convert from lat/lon to RD.
>> >>>>>>>> trans.transform(inCoord, outCoord);
>> >>>>>>>> final double[] point = new double[2];
>> >>>>>>>> point[0]=outCoord.x;
>> >>>>>>>> point[1]=outCoord.y;
>> >>>>>>>>
>> >>>>>>>> return point;
>> >>>>>>>> ===============
>> >>>>>>>>
>> >>>>>>>> Does anyone have a clue what's going wrong over here?
>> >>>>>>>>
>> >>>>>>>> Thanks for your patience.
>> >>>>>>>>
>> >>>>>>>> Regards,
>> >>>>>>>> Peter Peterse
>> >>>>>>>> _______________________________________________
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