[Proj4j] Conversion issue
Martin Davis
mtnclimb at gmail.com
Mon Oct 22 08:23:39 PDT 2012
Good sleuthing, Peter. I'll make this change in SVN as well.
Martin
On Mon, Oct 22, 2012 at 6:36 AM, P. Peterse (HDB)
<p.peterse at han-dataport.nl> wrote:
> 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> 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> 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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>>>>>>>
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