Re: [udig-devel] net.refractions.udig.libs / geotools 2.6 issue

[gershwinou <gershwinou@xxxxxxxxx>]

ok got the issue, i guess this is critical.

i was using geotools 2.6.0 and it worked ok in my class. Downloaded 2.6.4 and got the same error as the udig bundle (using 2.6-SNAPSHOT)

any chances you have made some changes of the WarpTransform2D class in the between?

gersh

On Tue, Jul 20, 2010 at 16:51, gershwinou <gershwinou@xxxxxxxxx> wrote:

well i added this line at startup of my working version but no change. I also commented out the net.refractions.udig.libs activator line and there is no change...

my geotools 2.6 is using hsql database, populating with epsg version 7.1

i cannot say for the udig bundles, i did not see the logs saying the classical message about populating the database.

i am digging in.

Thanks a lot for your hints

- gersh

On Tue, Jul 20, 2010 at 15:49, Jody Garnett <jody.garnett@xxxxxxxxx> wrote:

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]]

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_______________________________________________
User-friendly Desktop Internet GIS (uDig)
http://udig.refractions.net
http://lists.refractions.net/mailman/listinfo/udig-devel