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java.lang.Objectorg.geotools.gc.LocalizationGrid
LocalizationGrid
.
A factory for MathTransform2D
backed by a grid of localization.
A grid of localization is a two-dimensional array (or a matrix) of coordinate points.
The grid size is width
× height
. Input coordinates
are (i,j) index in the grid, where i must be in the range
[0..width-1]
and j in the range [0..height-1]
inclusive.
Output coordinates are the values stored in the grid of localization at the specified index.
The LocalizationGrid
class is usefull when the
"grid to coordinate system"
transform for a coverage is not some kind of global mathematical relationship like an
affine transform. Instead, the "real world" coordinates
are explicitly specified for each pixels. If the real world coordinates are know only for some
pixels at a fixed interval, then a transformation can be constructed by the concatenation of
an affine transform with a grid of localization. After a LocalizationGrid
object
has been fully constructed (i.e. real world coordinates have been specified for all grid cells),
a transformation from grid coordinates to "real world" coordinates can be obtained with
the getMathTransform()
method. If this transformation is close enough to an affine
transform, then an instance of AffineTransform
is returned. Otherwise, a transform
backed by the localization grid is returned.
The example below goes through the steps of constructing a coordinate system for a grid coverage
from its grid of localization. This example assumes that the "real world" coordinates are
longitudes and latitudes on the WGS84 ellipsoid.
// // Constructs a localization grid of size 10×10. // LocalizationGrid grid = new LocalizationGrid(10,10); for (int j=0; j<10; j++) { for (int i=0; i<10; i++) { double x = ...; // Set longitude here double y = ...; // Set latitude here grid.setLocalizationPoint
(i,j,x,y); } } // // Constructs the grid coordinate system. // CoordinateSystem realCS = GeographicCoordinateSystem.WGS84; CoordinateSystem gridCS = newFittedCoordinateSystem
("The grid CS", realCS, grid.getMathTransform()
, new AxisInfo[] { AxisInfo.X, AxisInfo.Y}); // // Constructs the grid coverage using the grid coordinate system (not the "real world" // one). It is usefull to display the coverage in its native CS before we resample it. // Note that if the grid of localization does not define the geographic location for // all pixels, then we need to specify some affine transform in place of the IDENTITY // argument. For example if the grid of localization defines the location of 1 pixel, // then skip 3, then defines the location of 1 pixel, etc., then the affine transform // should be AffineTransform.getScaleInstance(0.25, 0.25). // GridCoverage coverage; coverage = new GridCoverage("The grid coverage", theRaster, gridCS, MathTransform2D.IDENTITY, ...); FrameFactory.show(coverage); // // Project the coverage from its current 'gridCS' to the 'realCS'. If the grid of // localization was built from the orbit of some satellite, then the projected // coverage will tpypically have a curved aspect. // GridCoverageProcessor processor = GridCoverageProcessor.getDefault(); coverage = processor.doOperation("Resample", coverage, "CoordinateSystem", realCS); FrameFactory.show(coverage);
FittedCoordinateSystem
Constructor Summary | |
LocalizationGrid(int width,
int height)
Deprecated. Construct an initially empty localization grid. |
Method Summary | |
java.awt.geom.AffineTransform |
getAffineTransform()
Deprecated. Returns an affine transform for the whole grid. |
java.awt.geom.Point2D |
getLocalizationPoint(java.awt.Point source)
Deprecated. Returns the "real world" coordinates for the specified grid coordinates. |
MathTransform2D |
getMathTransform()
Deprecated. Returns a math transform from grid to "real world" coordinates. |
java.awt.Dimension |
getSize()
Deprecated. Returns the grid size. |
boolean |
isMonotonic(boolean strict)
Deprecated. Returns true if all coordinates in this grid are increasing or decreasing.
|
boolean |
isNaN()
Deprecated. Returns true if this localization grid
contains at least one NaN value. |
void |
removeSingularities()
Deprecated. Make sure that the grid doesn't contains identical consecutive ordinates. |
void |
setLocalizationPoint(int sourceX,
int sourceY,
double targetX,
double targetY)
Deprecated. Set a point in this localization grid. |
void |
setLocalizationPoint(java.awt.Point source,
java.awt.geom.Point2D target)
Deprecated. Set a point in this localization grid. |
void |
transform(java.awt.geom.AffineTransform transform,
java.awt.Rectangle region)
Deprecated. Apply a transformation to every "real world" coordinate points in a sub-region of this grid. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public LocalizationGrid(int width, int height)
(NaN,NaN)
.
width
- Number of grid's columns.height
- Number of grid's rows.Method Detail |
public java.awt.Dimension getSize()
xinput = [0..width-1]
and
yinput = [0..height-1]
inclusive.
public java.awt.geom.Point2D getLocalizationPoint(java.awt.Point source)
getMathTransform()
instead.
source
- The point in grid coordinates.
java.lang.IndexOutOfBoundsException
- If the source point is not in this grid's range.public void setLocalizationPoint(java.awt.Point source, java.awt.geom.Point2D target)
source
- The point in grid coordinates.target
- The corresponding point in "real world" coordinates.
java.lang.IndexOutOfBoundsException
- If the source point is not in this grid's range.public void setLocalizationPoint(int sourceX, int sourceY, double targetX, double targetY)
sourceX
- x coordinates in grid coordinates,
in the range [0..width-1]
inclusive.sourceY
- y coordinates in grid coordinates.
in the range [0..height-1]
inclusive.targetX
- x coordinates in "real world" coordinates.targetY
- y coordinates in "real world" coordinates.
java.lang.IndexOutOfBoundsException
- If the source coordinates is not in this grid's range.public void transform(java.awt.geom.AffineTransform transform, java.awt.Rectangle region)
transform
- The transform to apply.region
- The bounding rectangle (in grid coordinate) for region where to
apply the transform, or null
to transform the whole grid.public boolean isNaN()
true
if this localization grid
contains at least one NaN
value.
public boolean isMonotonic(boolean strict)
true
if all coordinates in this grid are increasing or decreasing.
More specifically, returns true
if the following conditions are meets:
strict
is
true
, then coordinates must be strictly increasing or decreasing (i.e.
equals value are not accepted). NaN
values are always ignored.
strict
- true
to require strictly increasing or decreasing order,
or false
to accept values that are equals.
true
if coordinates are increasing or decreasing in the same
direction for all rows and columns.public void removeSingularities()
public java.awt.geom.AffineTransform getAffineTransform()
public MathTransform2D getMathTransform()
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