Examples of org.geotools.referencing.operation.builder.AffineTransformBuilder

org.geotools.referencing.operation.builder.AffineTransformBuilder

Builds {@linkplain org.opengis.referencing.operation.MathTransform MathTransform} setup as Affine transformation from a list of {@linkplain MappedPosition MappedPosition}. The calculation uses least square method. The Affine transform equation:

                                                        [ x']   [  m00  m01  m02  ] [ x ]   [ m00x + m01y + m02 ] [ y'] = [  m10  m11  m12  ] [ y ] = [ m10x + m11y + m12 ] [ 1 ]   [   0    0    1   ] [ 1 ]   [         1         ]  x' = m * x

In the case that we have more identical points we can write it like this (in Matrix):

  [ x'₁ ]      [ x₁ y₁ 1  0  0  0 ]   [ m00 ] [ x'₂ ]      [ x₂ y₂ 1  0  0  0 ]   [ m01 ] [  .  ]      [        .         ]   [ m02 ] [  .  ]      [        .         ] * [ m10 ] [ x'_n ]   =  [ x_n y_n 1  0  0  0 ]   [ m11 ] [ y'₁ ]      [ 0  0  0  x₁ y₁ 1 ]   [ m12 ] [ y'₂ ]      [ 0  0  0  x₂ y₂ 1 ]   [  .  ]      [        .         ]                                [  .  ]      [        .         ]                         [ y'_n ]      [ 0  0  0  x_n y_n 1 ]    x' = A*m

Using the least square method we get this result:

 m = (A^TA)^-1 A^Tx'

@since 2.4 @source $URL$ @version $Id$ @author Jan Jezek

     * Get Math Transform based on control points
     * 
     * @return MathTransform
     */
    public synchronized MathTransform getTransform() {
        AffineTransformBuilder builder = new AffineTransformBuilder(controlPoints);
        try {
            return builder.getMathTransform();
        } catch (FactoryException e) {
            LOGGER.log(Level.WARNING, e.getLocalizedMessage(), e);
            return null;
        }
    }

        System.out.println("sy  "+a2g2.getYScale());
        System.out.println("sxy "+a2g2.getSkew());
        System.out.println(aab.getMathTransform());
        
        System.out.println("Afinita------------------------------------------------------");
        AffineTransformBuilder atb = new  AffineTransformBuilder(builder.getMappedPositions());
       
       // transformTest(atb.getMathTransform(), builder.getMappedPositions());
   /*     AffineToGeometric a2g3 = new AffineToGeometric((AffineTransform2D)atb.getMathTransform());
        System.out.println("Parametry------------------------------------------------------");
        System.out.println(a2g3.getRotation()*180/Math.PI);

Related Classes of org.geotools.referencing.operation.builder.AffineTransformBuilder

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