Package org.geotools.coverage.processing.operation

Class Resample

Object
AbstractOperation
Operation2D
Resample
All Implemented Interfaces:
Serializable, Operation
public class Resample extends Operation2D
Resample a grid coverage using a different grid geometry. This operation provides the following functionality:

  • Resampling
    The grid coverage can be resampled at a different cell resolution. Some implementations may be able to do resampling efficiently at any resolution. Also a non-rectilinear grid coverage can be accessed as rectilinear grid coverage with this operation.
  • Reprojecting
    The new grid geometry can have a different coordinate reference system than the underlying grid geometry. For example, a grid coverage can be reprojected from a geodetic coordinate reference system to Universal Transverse Mercator CRS.
  • Subsetting
    A subset of a grid can be viewed as a separate coverage by using this operation with a grid geometry which as the same geoferencing and a region. Grid range in the grid geometry defines the region to subset in the grid coverage.

Geotools extension:
The "Resample" operation use the default CoordinateOperationFactory for creating a transformation from the source to the destination coordinate reference systems. If a custom factory is desired, it may be supplied as a rendering hint with the Hints.COORDINATE_OPERATION_FACTORY key. Rendering hints can be supplied to org.geotools.coverage.processing.DefaultProcessor at construction time.

Name: "Resample"
JAI operator: "Affine" or "Warp"
Parameters:

Name Class Default value Minimum value Maximum value
"Source" GridCoverage2D N/A N/A N/A
"InterpolationType" CharSequence "NearestNeighbor" N/A N/A
"CoordinateReferenceSystem" CoordinateReferenceSystem Same as source grid coverage N/A N/A
"GridGeometry" GridGeometry (automatic) N/A N/A
"BackgroundValues" double[] N/A N/A N/A
Since:
2.2
Author:
Martin Desruisseaux (IRD), Giannecchini Simone, GeoSolutions SAS, Daniele Romagnoli, GeoSolutions SAS
See Also:

  • Field Details

    • INTERPOLATION_TYPE

      public static final ParameterDescriptor<Object> INTERPOLATION_TYPE
      The parameter descriptor for the interpolation type.

    • COORDINATE_REFERENCE_SYSTEM

      public static final ParameterDescriptor<CoordinateReferenceSystem> COORDINATE_REFERENCE_SYSTEM
      The parameter descriptor for the coordinate reference system.

    • GRID_GEOMETRY

      public static final ParameterDescriptor<GridGeometry> GRID_GEOMETRY
      The parameter descriptor for the grid geometry.

    • BACKGROUND_VALUES

      public static final ParameterDescriptor<double[]> BACKGROUND_VALUES
      The parameter descriptor for the BackgroundValues.

    • OPERATION

      public static final String OPERATION
      Key for the reprojection operation being used (null if no operation is performed)
      See Also:

    • WARP_TYPE

      public static final String WARP_TYPE
      Key for the warp operation Class, null otherwise
      See Also:

    • GRID_DIMENSIONS

      public static final String GRID_DIMENSIONS
      Key for the warp grid dimensions, available only if a WarpGrid is being used. Returned as a Dimension object
      See Also:

  • Constructor Details

    • Resample

      public Resample()
      Constructs a "Resample" operation.

  • Method Details

    • doOperation

      public Coverage doOperation(ParameterValueGroup parameters, Hints hints)
      Resamples a grid coverage. This method is invoked by org.geotools.coverage.processing.DefaultProcessor for the "Resample" operation.
      Specified by:
      doOperation in class AbstractOperation
      Parameters:
      parameters - List of name value pairs for the parameters required for the operation.
      hints - A set of rendering hints, or null if none. The DefaultProcessor may provides hints for the following keys: Hints.COORDINATE_OPERATION_FACTORY and Hints.JAI_INSTANCE.
      Returns:
      The result as a coverage.

    • computeGridGeometry

      public static GridGeometry computeGridGeometry(GridCoverage source, Bounds target) throws TransformException
      Computes a grid geometry from a source coverage and a target envelope. This is a convenience method for computing the GRID_GEOMETRY argument of a "resample" operation from an envelope. The target envelope may contains a different coordinate reference system, in which case a reprojection will be performed.
      Parameters:
      source - The source coverage.
      target - The target envelope, including a possibly different coordinate reference system.
      Returns:
      A grid geometry inferred from the target envelope.
      Throws:
      TransformException - If a transformation was required and failed.
      Since:
      2.5