Package noaa.coastwatch.util.trans

Class EllipsoidPerspectiveProjection

java.lang.Object

noaa.coastwatch.util.MetadataContainer

noaa.coastwatch.util.trans.EarthTransform

noaa.coastwatch.util.trans.EarthTransform2D

noaa.coastwatch.util.trans.SensorScanProjection

noaa.coastwatch.util.trans.EllipsoidPerspectiveProjection

All Implemented Interfaces:

Cloneable

public class EllipsoidPerspectiveProjection
extends SensorScanProjection

The EllipsoidPerspectiveProjection class simulates the earth view that a theoretical satellite would have from orbit. The satellite is equipped with a sensor that sweeps rows from top to bottom and columns from left to right at user-specified stepping angles. It is assumed that the satellite is pointed at the center of the Earth. A WGS 84 earth model is used to perform ellipsoid intersection and geodetic latitude calculations. As of version 3.4.1, two types of scanners are supported: a GOES-style scanner which scans each column of the image in a vertical north/south direction, and a Meteosat/Himawari-style scanner which scans each row in the horizontal east-west direction. Previously only Meteosat/Himawari style scanners were supported.

Since:

3.1.9

Author:

Peter Hollemans

Field Summary

Fields

Modifier and Type	Field	Description
static final int	SENSOR_CODE	The sensor type code.
static final String	SENSOR_TYPE	The sensor type string.

Fields inherited from class noaa.coastwatch.util.trans.SensorScanProjection

DESCRIPTION, parameters

Fields inherited from class noaa.coastwatch.util.trans.EarthTransform

boundaryHandler, dims

Constructor Summary

Constructors

Constructor	Description
EllipsoidPerspectiveProjection(double[] parameters, int[] dimensions)	Constructs a new ellipsoid perspective projection.

Method Summary

Modifier and Type	Method	Description
String	describe()	Provides a description of this class.
int	getSensorCode()	Gets a code for this sensor scan type.
String	getSensorType()	Gets a description of this sensor scan type.
static void	main(String[] argv)	Tests this class.
protected void	transformImpl(DataLocation dataLoc, EarthLocation earthLoc)	Implements the data to geographic transform.
protected void	transformImpl(EarthLocation earthLoc, DataLocation dataLoc)	Implements the geographic to data transform.

Methods inherited from class noaa.coastwatch.util.trans.SensorScanProjection

equals, getParameters

Methods inherited from class noaa.coastwatch.util.trans.EarthTransform2D

get2DVersion, getBoundingBox, getWorldAxes, isOrientable, setPointTransform, transformToPoint

Methods inherited from class noaa.coastwatch.util.trans.EarthTransform

clone, distance, getBoundaryHandler, getDatum, getDimensions, getResolution, getSpheroid, getSpheroid, getSubset, isInvertible, transform, transform, transform, transform

Methods inherited from class noaa.coastwatch.util.MetadataContainer

getMetadataMap

Methods inherited from class java.lang.Object

finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

SENSOR_TYPE

public static final String SENSOR_TYPE

The sensor type string.

See Also:

• Constant Field Values

SENSOR_CODE

public static final int SENSOR_CODE

The sensor type code.

See Also:

• Constant Field Values

Constructor Details

EllipsoidPerspectiveProjection

public EllipsoidPerspectiveProjection(double[] parameters,
 int[] dimensions)

Constructs a new ellipsoid perspective projection. The satellite is located at the specified geocentric location and radius, and is pointed towards the center of the Earth.

Parameters:

parameters - the array of sensor parameters (either 5 or 6 values):

1. Subpoint latitude in degrees (geocentric).
2. Subpoint longitude in degrees.
3. Distance of satellite from center of earth in kilometers.
4. Scan step angle in row direction in radians.
5. Scan step angle in column direction in radians.
6. Vertical scan flag, non-zero for vertical (optional). If not included, a horizontal Meteosat/Himawari style scanner is assumed.

dimensions - the total grid dimensions as [rows, columns].

Method Details

getSensorType

public String getSensorType()

Description copied from class: SensorScanProjection

Gets a description of this sensor scan type.

Specified by:

getSensorType in class SensorScanProjection

getSensorCode

public int getSensorCode()

Description copied from class: SensorScanProjection

Gets a code for this sensor scan type.

Specified by:

getSensorCode in class SensorScanProjection

transformImpl

protected void transformImpl(EarthLocation earthLoc,
 DataLocation dataLoc)

Description copied from class: EarthTransform

Implements the geographic to data transform.

Specified by:

transformImpl in class EarthTransform

See Also:

• EarthTransform.transform(EarthLocation,DataLocation)

transformImpl

protected void transformImpl(DataLocation dataLoc,
 EarthLocation earthLoc)

Description copied from class: EarthTransform

Implements the data to geographic transform.

Specified by:

transformImpl in class EarthTransform

See Also:

• EarthTransform.transform(DataLocation,EarthLocation)

describe

public String describe()

Description copied from class: SensorScanProjection

Provides a description of this class.

Overrides:

describe in class SensorScanProjection

main

public static void main(String[] argv)

Tests this class.

Parameters:

argv - the array of command line parameters.