org.geotools.coverage.processing.AbstractOperation
org.geotools.coverage.processing.Operation2D
org.geotools.coverage.processing.OperationJAI
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java.lang.Object
Wraps a JAI's OperationDescriptor for interoperability with
Java Advanced Imaging.
This class help to leverage the rich set of JAI operators in an GeoAPI framework.
inherits operation name and argument types from OperationDescriptor,
except the source argument type (usually RenderedImage.class) which is
set to GridCoverage2D.class. If there is only one source argument, it
will be renamed for better compliance with OpenGIS usage.
The entry point for applying an operation is the usual doOperation method.
The default implementation forward the call to other methods for different bits of tasks,
resulting in the following chain of calls:
doOperation:the entry point. resampleToCommonGeometry:reprojects all sources to the same coordinate reference system. deriveGridCoverage:gets the destination properties. deriveSampleDimension:gets the destination sample dimensions. deriveCategory:gets the destination categories. deriveRange:gets the expected range of values. deriveUnit:gets the destination units. createRenderedImage:the actual call to JAI.createNS.
| Nested Class Summary | |
protected static class |
OperationJAI.Parameters
A block of parameters for a GridCoverage2D processed by a OperationJAI.
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| Field Summary | |
protected javax.media.jai.OperationDescriptor |
operation
The JAI's operation descriptor. |
| Fields inherited from class org.geotools.coverage.processing.Operation2D |
SOURCE_0 |
| Fields inherited from class org.geotools.coverage.processing.AbstractOperation |
descriptor |
| Constructor Summary | |
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OperationJAI(javax.media.jai.OperationDescriptor operation)
Constructs a grid coverage operation backed by a JAI operation. |
protected |
OperationJAI(javax.media.jai.OperationDescriptor operation,
org.opengis.parameter.ParameterDescriptorGroup descriptor)
Constructs a grid coverage operation backed by a JAI operation. |
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OperationJAI(java.lang.String operation)
Constructs a grid coverage operation from a JAI operation name. |
| Method Summary | |
protected boolean |
computeOnGeophysicsValues(org.opengis.parameter.ParameterValueGroup parameters)
Returns if grid coverage content should be converted from sample values to geophysics value before to apply an operation. |
protected java.awt.image.RenderedImage |
createRenderedImage(javax.media.jai.ParameterBlockJAI parameters,
java.awt.RenderingHints hints)
Applies the JAI operation. |
protected Category |
deriveCategory(Category[] categories,
OperationJAI.Parameters parameters)
Returns the quantitative category for a single sample dimension in the target grid coverage. |
protected GridCoverage2D |
deriveGridCoverage(GridCoverage2D[] sources,
OperationJAI.Parameters parameters)
Applies a JAI operation to a grid coverage. |
protected org.opengis.util.InternationalString |
deriveName(GridCoverage2D[] sources,
int primarySourceIndex,
OperationJAI.Parameters parameters)
Returns a name for the target grid coverage based on the given sources. |
protected NumberRange |
deriveRange(NumberRange[] ranges,
OperationJAI.Parameters parameters)
Returns the range of value for a single sample dimension in the target grid coverage. |
protected GridSampleDimension[] |
deriveSampleDimension(GridSampleDimension[][] bandLists,
OperationJAI.Parameters parameters)
Returns the sample dimensions for the target grid coverage. |
protected javax.units.Unit |
deriveUnit(javax.units.Unit[] units,
OperationJAI.Parameters parameters)
Returns the unit of data for a single sample dimension in the target grid coverage. |
protected org.opengis.coverage.Coverage |
doOperation(org.opengis.parameter.ParameterValueGroup parameters,
Hints hints)
Applies a process operation to a grid coverage. |
boolean |
equals(java.lang.Object object)
Compares the specified object with this operation for equality. |
static javax.media.jai.JAI |
getJAI(java.awt.RenderingHints hints)
Returns the JAI instance to use for operations on RenderedImage.
|
protected void |
resampleToCommonGeometry(GridCoverage2D[] sources,
org.opengis.referencing.crs.CoordinateReferenceSystem crs2D,
org.opengis.referencing.operation.MathTransform2D gridToCrs2D,
Hints hints)
Resamples all sources grid coverages to the same two-dimensional geometry before to apply the operation. |
| Methods inherited from class org.geotools.coverage.processing.Operation2D |
getFactory, getGridCoverageProcessor |
| Methods inherited from class org.geotools.coverage.processing.AbstractOperation |
ensureNonNull, getDescription, getDocURL, getName, getNumSources, getParameters, getProcessor, getVendor, getVersion, hashCode, toString |
| Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
| Field Detail |
protected final javax.media.jai.OperationDescriptor operation
| Constructor Detail |
public OperationJAI(java.lang.String operation)
throws org.opengis.coverage.processing.OperationNotFoundException
OperationDescriptor from the specified operation
name using the default JAI instance.
operation - JAI operation name (e.g. ).
org.opengis.coverage.processing.OperationNotFoundException - if no JAI descriptor was found for the given name.public OperationJAI(javax.media.jai.OperationDescriptor operation)
operation - The JAI operation descriptor.
protected OperationJAI(javax.media.jai.OperationDescriptor operation,
org.opengis.parameter.ParameterDescriptorGroup descriptor)
operation - The JAI operation descriptor.descriptor - The OGC parameters descriptor.| Method Detail |
protected boolean computeOnGeophysicsValues(org.opengis.parameter.ParameterValueGroup parameters)
doOperation. If this method returns , then the
computation will be performed on the geophysics view as returned by
GridCoverage2D.geophysics(true).
If this method returns , then the view will not be changed
before the operation is applied (i.e. the method is not invoked at all).
The default implementation always returns .
parameters - The parameters supplied by the user to the method.
GridCoverage2D.geophysics(boolean)
protected org.opengis.coverage.Coverage doOperation(org.opengis.parameter.ParameterValueGroup parameters,
Hints hints)
GridCoverage2D.geophysics(true).
This allow to performs all computation on geophysics values instead of encoded
samples. Note: this step is disabled if
computeOnGeophysicsValues returns
.gridToCRS relationship.deriveGridCoverage(org.geotools.coverage.grid.GridCoverage2D[], org.geotools.coverage.processing.OperationJAI.Parameters).
The sources in the are RenderedImage objects
obtained from GridCoverage2D.getRenderedImage().GridCoverage2D.geophysics(false).
doOperation in class AbstractOperationparameters - List of name value pairs for the parameters required for the operation.hints - A set of rendering hints, or if none.
deriveGridCoverage(org.geotools.coverage.grid.GridCoverage2D[], org.geotools.coverage.processing.OperationJAI.Parameters)
protected void resampleToCommonGeometry(GridCoverage2D[] sources,
org.opengis.referencing.crs.CoordinateReferenceSystem crs2D,
org.opengis.referencing.operation.MathTransform2D gridToCrs2D,
Hints hints)
throws InvalidGridGeometryException,
CannotReprojectException
doOperation method. Only the two-dimensional part is reprojected
(usually the spatial component of a CRS). Extra dimension (if any) are left unchanged. Extra
dimensions are typically time axis or depth. Note that extra dimensions are
not forced to a common geometry; only the two dimensions that apply to a
PlanarImage are. This is because the extra dimensions don't need to
be compatible for all operations. For example if a source image is a slice in a time series,
a second source image could be a slice in the frequency representation of this time series.
Subclasses should override this method if they want to specify target grid geometry and coordinate reference system different than the default ones. For example if a subclass wants to force all images to be referenced in a WGS 84 CRS, then it may overrides this method as below:
protected void resampleToCommonGeometry(...) {
crs2D = DefaultGeographicCRS.WGS84;
super.resampleToCommonGeometry(sources, crs2D, gridToCrs2D, hints);
}
sources - The source grid coverages to resample. This array is updated in-place as
needed (for example if a grid coverage is replaced by a projected one).crs2D - The target coordinate reference system to use, or for a
default one.gridToCrs2D - The target "grid to coordinate reference system" transform, or
for a default one.hints - The rendering hints, or if none.
InvalidGridGeometryException - if a source coverage has an unsupported grid geometry.
CannotReprojectException - if a grid coverage can't be resampled for some other reason.
protected GridCoverage2D deriveGridCoverage(GridCoverage2D[] sources,
OperationJAI.Parameters parameters)
doOperation(org.opengis.parameter.ParameterValueGroup, org.geotools.factory.Hints). The default implementation performs the following steps:
deriveSampleDimension(...) method.createRenderedImage(javax.media.jai.ParameterBlockJAI, java.awt.RenderingHints).GridCoverage2D object.
sources - The source coverages.parameters - Parameters, rendering hints and coordinate reference system to use.
doOperation(org.opengis.parameter.ParameterValueGroup, org.geotools.factory.Hints),
deriveSampleDimension(org.geotools.coverage.GridSampleDimension[][], org.geotools.coverage.processing.OperationJAI.Parameters),
JAI.createNS(java.lang.String, java.awt.image.renderable.ParameterBlock, java.awt.RenderingHints)
protected GridSampleDimension[] deriveSampleDimension(GridSampleDimension[][] bandLists,
OperationJAI.Parameters parameters)
deriveGridCoverage with a argument
initialized as below:
bandLists[i] array length is equals to the number of
sample dimensions in the source coverage i.This method shall returns an array with a length equals to the number of bands in the target image. If the sample dimensions can't be determined, then this method is allowed to returns .
The default implementation iterates among all bands and invokes the deriveCategory and deriveUnit methods for each of them. Subclasses
should override this method if they know a more accurate algorithm for determining sample
dimensions.
bandLists - The set of sample dimensions for each source GridCoverage2Ds.parameters - Parameters, rendering hints and coordinate reference system to use.
deriveCategory(org.geotools.coverage.Category[], org.geotools.coverage.processing.OperationJAI.Parameters),
deriveUnit(javax.units.Unit[], org.geotools.coverage.processing.OperationJAI.Parameters)
protected Category deriveCategory(Category[] categories,
OperationJAI.Parameters parameters)
deriveSampleDimension method for each band in the
target image. The default implementation creates a default category from the target range
of values returned by deriveRange.
categories - The quantitative categories from every sources. For unary operations
like , this array has a length of 1. For binary
operations like and , this array has a length of 2.parameters - Parameters, rendering hints and coordinate reference system to use.
protected NumberRange deriveRange(NumberRange[] ranges,
OperationJAI.Parameters parameters)
deriveCategory method for each band in the target image.
Subclasses should override this method in order to compute the target range of values.
For example, the operation may implements this method as below:
double min = ranges[0].getMinimum() + ranges[1].getMinimum(); double max = ranges[0}.getMaximum() + ranges[1}.getMaximum(); return new NumberRange(min, max);
ranges - The range of values from every sources. For unary operations like
, this array has a length of 1. For binary operations
like and , this array has a length of 2.parameters - Parameters, rendering hints and coordinate reference system to use.
protected javax.units.Unit deriveUnit(javax.units.Unit[] units,
OperationJAI.Parameters parameters)
deriveSampleDimension method for each band in the target
image. Subclasses should override this method in order to compute the target units from the
source units. For example a operation may implement this method as below:
if (units[0]!=null && units[1]!=null) {
return units[0].multiply(units[1]);
} else {
return super.deriveUnit(units, cs, parameters);
}
units - The units from every sources. For unary operations like
, this array has a length of 1. For binary operations
like and , this array has a length of 2.parameters - Parameters, rendering hints and coordinate reference system to use.
protected org.opengis.util.InternationalString deriveName(GridCoverage2D[] sources,
int primarySourceIndex,
OperationJAI.Parameters parameters)
deriveGridCoverage
method. The default implementation returns the operation name followed by the source name
between parenthesis, for example "GradientMagnitude(Sea Surface Temperature)".
sources - The sources grid coverage.primarySourceIndex - The index of what seems to be the primary source, or
if none of unknow.parameters - Parameters, rendering hints and coordinate reference system to use.
protected java.awt.image.RenderedImage createRenderedImage(javax.media.jai.ParameterBlockJAI parameters,
java.awt.RenderingHints hints)
operation.
The JAI instance to use can be fetch from getJAI(java.awt.RenderingHints). The default implementation
returns the following:
Subclasses may override this method in order to invokes a different JAI operation according the parameters.getJAI(hints).createNS(operation.getName(), parameters, hints)
parameters - The parameters to be given to JAI.hints - The rendering hints to be given to JAI.public static javax.media.jai.JAI getJAI(java.awt.RenderingHints hints)
JAI instance to use for operations on RenderedImage.
If no JAI instance is defined for the Hints.JAI_INSTANCE key, then the
default instance is returned.
hints - The rendering hints, or if none.
public boolean equals(java.lang.Object object)
equals in class AbstractOperation
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