uDig flips the forceXY preference setting[1]:
System.setProperty("org.geotools.referencing.forceXY", "true");
Is there a chance that is messing you up? You could try doing this yourself and
see if your 2.6 code produce the same answer?
Other then that udig is using epsg-h2 (rather then the more common and stable
epsg-hsql). What are you using when you test geotools 2.6?
Jody
[1] http://docs.codehaus.org/display/GEOTDOC/The+axis+order+issue
On 20/07/2010, at 11:15 PM, gershwinou wrote:
> I am cross-posting to geotools and udig, because i think both are concerned.
>
> So in a nutschell, i try to use geotools Warp2DTransform to perform warping
> from pixels coordinate to geographic coordinate. I have been using geotools
> for a while, but now i need to move geotools library to osgi bundle (here
> comes udig).
>
> So i used net.refractions.udig.libs that have already done the work. I am
> checking out the trunk, ie using geotools-2.6-SNAPSHOT version.
>
> Using directly the geotools 2.6 with my classes, Warp2DTransform Works ok. I
> input a set of GCPs and get a correct transformation, of degree 3.
> Using the same class in the udig bundles, the results is totally wrong, ie
> the coefficients are very low. See the difference below. The funny thing is
> that is that when i divide the outputs with prescales factors, i got results
> of the right order (ie coordinates around (43,12) instead of(0.006,0,001),
> but there are still wrong in the sense that coordinates are very close to
> each others (order of 0.0001 degrees instead of degrees).
>
> any hints?
>
> geotools 2.6-SNAPSHOT/udig eclipse bundle (Wrong coeffs)
>
> PARAM_MT["WarpPolynomial",
> PARAMETER["degree", 3],
> PARAMETER["xCoeffs", {0.006612524390220642, 0.00000001603510035864,
> -0.00000000411600664663, -0.00000000000000079568, -0.00000000000000710382,
> -0.00000000000000444428, -0.00000000000000000005, -0.00000000000000000003,
> 0.00000000000000000026, 0.00000000000000000104}],
> PARAMETER["yCoeffs", {-0.0015807533636689186, 0.00000000305463854211,
> 0.00000001448123754244, 0.00000000000000241329, -0.00000000000000179796,
> 0.00000000000000177312, 0.00000000000000000001, -0.00000000000000000001,
> -0.00000000000000000005, -0.00000000000000000025}],
> PARAMETER["preScaleX", 0.0001521606754977256],
> PARAMETER["preScaleY", 0.00012525050260592252],
> PARAMETER["postScaleX", 0.9410438537597656],
> PARAMETER["postScaleY", 1.0499610900878906]]
>
>
> geotools 2.6 (right Coeffs)
>
> PARAM_MT["WarpPolynomial",
> PARAMETER["degree", 3],
> PARAMETER["xCoeffs", {46.180110931396484, 0.7821832299232483,
> -0.21910369396209717, -0.0004944244283251464, -0.0024764996487647295,
> 0.00076442607678473, -0.00001066674121830147, 0.0000213175590033643,
> 0.0001045847893692553, 0.00009047376806847751}],
> PARAMETER["yCoeffs", {-12.020193099975586, 0.16218608617782593,
> 0.8374767303466797, 0.0009584086365066469, -0.0007706039468757808,
> 0.0001044207310769707, -0.0000068093295340077, -0.00006432097870856524,
> 0.00001632759085623547, -0.00000976871160673909}],
> PARAMETER["preScaleX", 0.0001521606754977256],
> PARAMETER["preScaleY", 0.00012525050260592252],
> PARAMETER["postScaleX", 0.9410438537597656],
> PARAMETER["postScaleY", 1.0499610900878906]]
>
>
>
>
>
>
> _______________________________________________
> User-friendly Desktop Internet GIS (uDig)
> http://udig.refractions.net
> http://lists.refractions.net/mailman/listinfo/udig-devel
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