Examples of org.geotools.coverage.GridSampleDimension

org.geotools.coverage.GridSampleDimension
Describes the data values for a coverage as a list of {@linkplain Category categories}. For a grid coverage a sample dimension is a band. Sample values in a band may be organized in categories. This {@code GridSampleDimension} implementation is capable to differenciatequalitative and quantitative categories. For example an image of sea surface temperature (SST) could very well defines the following categories:
```
 [0]       : no data [1]       : cloud [2]       : land [10..210] : temperature to be converted into Celsius degrees through a linear equation 
```
In this example, sample values in range {@code [10..210]} defines a quantitative category,while all others categories are qualitative. The difference between those two kinds of category is that the {@link Category#getSampleToGeophysics} method returns a non-null transform if andonly if the category is quantitative.
While this class can be used with arbitrary {@linkplain org.opengis.coverage.Coverage coverage}, the primary target for this implementation is {@linkplain org.opengis.coverage.grid.GridCoverage grid coverage} storing their sample values as integers. This explain the "{@code Grid}" prefix in the class name. @since 2.1 @source $URL$ @version $Id$ @author Martin Desruisseaux (IRD)

    // setting bands names.
    for (int i = 0; i < numBands; i++) {
            final ColorInterpretation colorInterpretation=TypeMap.getColorInterpretation(cm, i);
            if(colorInterpretation==null)
                   throw new IOException("Unrecognized sample dimension type");
      bands[i] = new GridSampleDimension(colorInterpretation.name()).geophysics(true);
    }


        return coverageFactory.create(rasterManager.getCoverageIdentifier(), image,new GeneralEnvelope(bbox), bands, null, null);    


  }

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    @Test
    public void testTypes() {
        // Creation of a default field type
        Set<SampleDimension> sampleDims = new HashSet<SampleDimension>();
        GridSampleDimension sampleDim = new GridSampleDimension("test");
        sampleDims.add(sampleDim);
        NameImpl name = new NameImpl("test");
        SimpleInternationalString description = new SimpleInternationalString("test");
        FieldType fieldType = new DefaultFieldType(name, description, sampleDims);

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    final int numBands = image.getSampleModel().getNumBands();
    final GridSampleDimension[] bands = new GridSampleDimension[numBands];
    // setting bands names.
    for (int i = 0; i < numBands; i++) {


      bands[i] = new GridSampleDimension("band " + i);
    }
    final String filename = new File(path).getName();
    final GridCoverageFactory factory = org.geotools.coverage.CoverageFactoryFinder.getGridCoverageFactory(GeoTools.getDefaultHints());
    envelope.setCoordinateReferenceSystem(crs);
    return factory.create(filename, image, envelope,bands, null, null);

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        // range = imageReader.getRasterReader().getRange();


        /*
         * create the categories from the color rules
         */
        GridSampleDimension band = createGridSampleDimension(metaDataTable, range);
        band = band.geophysics(true);


        // create a relationship between the real region in the world and the
        // jai space. N.B. the
        // image dimension is only the real dimension which can be extract to a
        // file.

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                catsList.add(dataCategory);
            }


            Category[] array = (Category[]) catsList.toArray(new Category[catsList.size()]);
            return new GridSampleDimension(name, array, null);
        } else {
            return new GridSampleDimension(name, new Category[]{}, null);
        }
    }

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                final ColorInterpretation colorInterpretation;
                colorInterpretation = TypeMap.getColorInterpretation(cm, i);
                if (colorInterpretation == null) {
                    throw new IOException("Unrecognized sample dimension type");
                }
                bands[i] = new GridSampleDimension(colorInterpretation.name()).geophysics(true);
            }
        }


        return bands;
    }

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      assertEquals(1, bkg.length);
      assertEquals(Double.valueOf(-9999.0), bkg[0]);
      
      // test grid sampledimension no data property
      final Category noDataCategory= new Category(CoverageUtilities.NODATA,new Color[]{Color.black},NumberRange.create(Double.valueOf(-9999.0),Double.valueOf(-9999.0)),NumberRange.create(Double.valueOf(-9999.0),Double.valueOf(-9999.0)));
      final GridSampleDimension gsd = new GridSampleDimension("test", new Category[]{noDataCategory},Unit.ONE);
      gc= CoverageFactoryFinder.getGridCoverageFactory(null).
      create(
          "test", 
          ImageFunctionDescriptor.create(new MyImageFunction(), Integer.valueOf(800), Integer.valueOf(600), Float.valueOf(1.0f),  Float.valueOf(1.0f),  Float.valueOf(0.0f),  Float.valueOf(0.0f), null), 
          gg2D,

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                    }
                    final Name nameImpl = new NameImpl(coverageName.getLocalPart(), elementName);
                    final InternationalString description = new SimpleInternationalString(product!=null?product.getDescription():elementName);


                    // setting bands names.
                    final GridSampleDimension gridBand = Utilities.buildBands(band, elementName, unit);
                    final HDF4ProductFieldType fd = new HDF4ProductFieldType(nameImpl, description, gridBand);
                    fields.put(elementName, fd);
                }


                // //

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    // setting bands names.
    for (int i = 0; i < numBands; i++) {
            final ColorInterpretation colorInterpretation=TypeMap.getColorInterpretation(cm, i);
            if(colorInterpretation==null)
                   throw new IOException("Unrecognized sample dimension type");
      bands[i] = new GridSampleDimension(colorInterpretation.name()).geophysics(true);
    }


        // creating coverage
        if (raster2Model != null) {
            return coverageFactory.create(coverageName, image, coverageCRS,

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                               throw new IOException("Unrecognized sample dimension type");
                        Category[] categories = null;
                        if (nan!=null){
                            categories = new Category[]{nan};
                        }
                            bands[i] = new GridSampleDimension(colorInterpretation.name(),categories,null).geophysics(true);
                }
                // creating coverage
                if (raster2Model != null) {
                        return coverageFactory.create(coverageName, image, crs,
                                        raster2Model, bands, null, null);

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