Examples of org.geotools.coverage.grid.GridCoverage2D.view()

Class org.geotools.coverage.grid.GridCoverage2D

Examples of org.geotools.coverage.grid.GridCoverage2D.view()

org.geotools.coverage.grid.GridCoverage2D.view()
Returns a view of the specified type. Valid types are:
- {@link ViewType#GEOPHYSICS GEOPHYSICS}: all sample values are equals to geophysics ("real world") values without the need for any transformation. The {@linkplain SampleDimension#getSampleToGeophysics sample to geophysics} transform{@linkplain org.opengis.referencing.operation.MathTransform1D#isIdentity is identity}for all sample dimensions. "No data" values (if any) are expressed as {@linkplain Float#NaN NaN} numbers. This view is suitable for computation, but usuallynot for rendering.
- {@link ViewType#PACKED PACKED}: sample values are typically integers. A {@linkplain SampleDimension#getSampleToGeophysics sample to geophysics} transform mayexists for converting them to "real world" values.
- {@link ViewType#RENDERED RENDERED}: synonymous of {@code PACKED} for now. Will beimproved in a future version.
- {@link ViewType#PHOTOGRAPHIC PHOTOGRAPHIC}: synonymous of {@code RENDERED} for now.Will be improved in a future version.
- {@link ViewType#SAME SAME}: returns {@code this} coverage unchanged.
This method may be understood as applying the JAI's {@linkplain javax.media.jai.operator.PiecewiseDescriptor piecewise} operation withbreakpoints specified by the {@link org.geotools.coverage.Category} objects in eachsample dimension. However, it is more general in that the transformation specified with each breakpoint doesn't need to be linear. On an implementation note, this method tries to use the first of the following operations which is found applicable: identity, {@linkplain javax.media.jai.operator.LookupDescriptor lookup}, {@linkplain javax.media.jai.operator.RescaleDescriptor rescale}, {@linkplain javax.media.jai.operator.PiecewiseDescriptor piecewise} and inlast ressort a more general (but slower) sample transcoding algorithm. @param type The kind of view wanted. @return The grid coverage. Never {@code null}, but may be {@code this}. @see GridSampleDimension#geophysics @see org.geotools.coverage.Category#geophysics @see javax.media.jai.operator.LookupDescriptor @see javax.media.jai.operator.RescaleDescriptor @see javax.media.jai.operator.PiecewiseDescriptor @since 2.5

        //
        ///////////////////////////////////////////////////////////////////////
        // on this one the subsample average should NOT go back to the
        // geophysiscs view before being applied
        interp = Interpolation.getInstance(Interpolation.INTERP_NEAREST);
        scale(floatCoverage.view(PACKED), interp);


        // Play with a rotated coverage
        scale(rotate(floatCoverage.view(GEOPHYSICS), Math.PI/4), null);
    }

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        // geophysiscs view before being applied
        interp = Interpolation.getInstance(Interpolation.INTERP_NEAREST);
        scale(floatCoverage.view(PACKED), interp);


        // Play with a rotated coverage
        scale(rotate(floatCoverage.view(GEOPHYSICS), Math.PI/4), null);
    }


    /**
     * Applies a scale on the photographic view of the given coverage.
     *

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        //
        ///////////////////////////////////////////////////////////////////////
        // on this one the subsample average should NOT go back to the
        // geophysiscs view before being applied
        interp = Interpolation.getInstance(Interpolation.INTERP_NEAREST);
        affine(floatCoverage.view(PACKED), interp);


        // Play with a rotated coverage
        affine(rotate(floatCoverage.view(GEOPHYSICS), Math.PI/4), null);
    }

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        // geophysiscs view before being applied
        interp = Interpolation.getInstance(Interpolation.INTERP_NEAREST);
        affine(floatCoverage.view(PACKED), interp);


        // Play with a rotated coverage
        affine(rotate(floatCoverage.view(GEOPHYSICS), Math.PI/4), null);
    }


    /**
     * Applies an affine operation on the photographic view of the given coverage.
     *

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                        // fallthrough same code than PACKED.
    case PACKED:
      // in this case we work on the non geophysics version because it
      // should be faster than working on the geophysics one. We are going
      // to work on a single band indexed image.
      sourceCoverage = sourceCoverage.view(strategy);
      sourceImage = sourceCoverage.getRenderedImage();
      break;
    }
  
    // /////////////////////////////////////////////////////////////////////

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                      properties); // Properties
  
    
    // now let's see what we need to do in order to clean things up
    if (strategy == ViewType.GEOPHYSICS)
      return result.view(ViewType.PACKED);
    if (strategy == ViewType.PACKED)
      return result.view(ViewType.GEOPHYSICS);
    return result;    
  }

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    // now let's see what we need to do in order to clean things up
    if (strategy == ViewType.GEOPHYSICS)
      return result.view(ViewType.PACKED);
    if (strategy == ViewType.PACKED)
      return result.view(ViewType.GEOPHYSICS);
    return result;    
  }


}

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        /*
         * The resampling may have been performed on the geophysics view.
         * Try to restore the original view.
         */
        GridCoverage2D coverage = new Resampler2D(source, image, geometry, sampleDimensions, properties, hints);
        coverage = coverage.view(finalView);
        return coverage;
    }
    
    /**
     * Creates a new coverage with a different coordinate reference reference system. If a

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        /*
         * Applies the operation. This delegates the work to the chain of 'deriveXXX' methods.
         */
        GridCoverage2D coverage = deriveGridCoverage(sources, params);
        if (primarySourceType != null) {
            coverage = coverage.view(primarySourceType);
        }
        return coverage;
    }


    /**

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        // view before being applied.
        subsampleAverage(originallyIndexedCoverage.view(PACKED), false);


        // On this one the subsample average should NOT go back to the
        // geophysics view before being applied.
        subsampleAverage(floatCoverage.view(PACKED), true);


        // On this one the subsample average should go back to the
        // geophysiscs view before being applied.
        subsampleAverage(floatCoverage.view(PACKED), true);

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