ucar.unidata.view.sounding
Class SkewTCoordinateSystem

java.lang.Object
  visad.CoordinateSystem
      ucar.unidata.view.sounding.AerologicalCoordinateSystem
          ucar.unidata.view.sounding.SkewTCoordinateSystem

All Implemented Interfaces:

Serializable

public final class SkewTCoordinateSystem
extends AerologicalCoordinateSystem

Provides support for converting between the (x,y) coordinates on a skew T - log P diagram and (pressure,temperature) coordinates.

Instances of this class are immutable.

Version:

$Revision: 1.14 $ $Date: 2005/05/13 18:33:37 $

Author:

Steven R. Emmerson

See Also:

Serialized Form

Field Summary

static Real	DEFAULT_ISOTHERM_TANGENT The default isotherm tangent.
static Real	DEFAULT_MAXIMUM_PRESSURE The default maximum pressure.
static Real	DEFAULT_MAXIMUM_TEMPERATURE The default maximum temperature.
static Real	DEFAULT_MINIMUM_PRESSURE The default minimum pressure.
static Real	DEFAULT_MINIMUM_TEMPERATURE The default minimum temperature.
static Real	DEFAULT_TEMPERATURE_PER_LOG_PRESSURE The default change in temperature per natural logarithm of pressure in the vertical.

Method Summary

AerologicalCoordinateSystem	createDisplayCoordinateSystem(AerologicalCoordinateSystem acs) Create a 3D display coordinate system from the (possibly) 2D input.
boolean	equals(Object obj) Indicate whether or not this coordinate system is the same as another.
double[][]	fromReference(double[][] coords) Transforms (X,Y) coordinates to (pressure,temperature) coordinates.
Real	getIsothermTangent() Gets the tangent of the isotherms.
Real	getMaximumPressure() Gets the maximum display pressure.
Real	getMaximumTemperature() Gets the maximum display temperature.
Real	getMaximumX() Gets the maximum X coordinate.
Real	getMaximumY() Gets the maximum Y coordinate.
Real	getMinimumPressure() Gets the minimum display pressure.
Real	getMinimumTemperature() Gets the minimum display temperature.
Real	getMinimumX() Gets the minimum X coordinate.
Real	getMinimumY() Gets the minimum Y coordinate.
Real	getTemperaturePerLogPressure() Gets the change in temperature per natural logarithm of pressure in the vertical.
int	hashCode() Returns the hash code of this instance.
static SkewTCoordinateSystem	instance() Factory method for obtaining an instance.
static SkewTCoordinateSystem	instance(RealTupleType referenceTupleType) Factory method for obtaining an instance.
static SkewTCoordinateSystem	instance(RealTupleType referenceTupleType, Real minimumPressure, Real maximumPressure, Real minimumTemperature, Real maximumTemperature, Real isothermTangent, Real temperaturePerLogPressure, Unit pressureUnit, Unit temperatureUnit, Real minimumX, Real maximumX, Real minimumY, Real maximumY) Factory method for obtaining an instance.
static void	main(String[] args) Tests this class.
double[][]	toReference(double[][] coords) Transforms (pressure,temperature) coordinates to (X,Y) coordinates.

Methods inherited from class visad.CoordinateSystem

canConvert, fromReference, fromReference, fromReference, getCoordinateSystemUnits, getDimension, getReference, getReferenceUnits, toReference, toReference, toReference, transformCoordinates, transformCoordinates, transformCoordinates, transformCoordinates, transformCoordinatesFreeUnits, transformCoordinatesFreeUnits

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Field Detail

DEFAULT_MINIMUM_PRESSURE

public static final Real DEFAULT_MINIMUM_PRESSURE

The default minimum pressure.

DEFAULT_MAXIMUM_PRESSURE

public static final Real DEFAULT_MAXIMUM_PRESSURE

The default maximum pressure.

DEFAULT_MINIMUM_TEMPERATURE

public static final Real DEFAULT_MINIMUM_TEMPERATURE

The default minimum temperature.

DEFAULT_MAXIMUM_TEMPERATURE

public static final Real DEFAULT_MAXIMUM_TEMPERATURE

The default maximum temperature.

DEFAULT_ISOTHERM_TANGENT

public static final Real DEFAULT_ISOTHERM_TANGENT

The default isotherm tangent.

DEFAULT_TEMPERATURE_PER_LOG_PRESSURE

public static final Real DEFAULT_TEMPERATURE_PER_LOG_PRESSURE

The default change in temperature per natural logarithm of pressure in the vertical.

Method Detail

instance

public static SkewTCoordinateSystem instance()
                                      throws VisADException

Factory method for obtaining an instance. The RealTupleType of the reference coordinate system will be (RealType.XAxis,RealType.YAxis) and the default coordinate transformation will be used.

Returns:

The default SkewTCoordinateSystem.

Throws:

VisADException - Couldn't create necessary VisAD object.

instance

public static SkewTCoordinateSystem instance(RealTupleType referenceTupleType)
                                      throws VisADException

Factory method for obtaining an instance. The default coordinate transformation will be used.

Parameters:

referenceTupleType - The type of the reference coordinate system. It shall have 2-3 components. The first component shall be the X component; the second component shall be the Y component; any third component is ignored.

Returns:

The SkewTCoordinateSystem with referenceTupleType as its reference RealTupleType.

Throws:

VisADException - Couldn't create necessary VisAD object.

instance

public static SkewTCoordinateSystem instance(RealTupleType referenceTupleType,
                                             Real minimumPressure,
                                             Real maximumPressure,
                                             Real minimumTemperature,
                                             Real maximumTemperature,
                                             Real isothermTangent,
                                             Real temperaturePerLogPressure,
                                             Unit pressureUnit,
                                             Unit temperatureUnit,
                                             Real minimumX,
                                             Real maximumX,
                                             Real minimumY,
                                             Real maximumY)
                                      throws UnitException,
                                             VisADException

Factory method for obtaining an instance. The resulting coordinate system will be centered in the given (X,Y) region and the given, extreme pressure and temperature values will not extend beyond it.

Parameters:

referenceTupleType - The type of the reference coordinate system.

minimumPressure - The minimum, displayed pressure.

maximumPressure - The maximum, displayed pressure.

minimumTemperature - The minimum, displayed temperature.

maximumTemperature - The maximum, displayed temperature.

isothermTangent - The tangent of the isotherms in the background plot.

temperaturePerLogPressure - The rate of change in temperature per natural logarithm of pressure in the vertical. Increasing this value squeezes the isotherms together on the plot.

pressureUnit - The unit of pressure for numeric values.

temperatureUnit - The unit of temperature for numeric values.

minimumX - The minimum X coordinate.

maximumX - The maximum X coordinate.

minimumY - The minimum Y coordinate.

maximumY - The maximum Y coordinate.

Returns:

The SkewTCoordinateSystem corresponding to the input parameters.

Throws:

UnitException - Improper unit.

VisADException - Couldn't create necessary VisAD object.

getMinimumPressure

public Real getMinimumPressure()

Gets the minimum display pressure.

Specified by:

getMinimumPressure in class AerologicalCoordinateSystem

Returns:

The minimum display pressure.

getMaximumPressure

public Real getMaximumPressure()

Gets the maximum display pressure.

Specified by:

getMaximumPressure in class AerologicalCoordinateSystem

Returns:

The maximum display pressure.

getMinimumTemperature

public Real getMinimumTemperature()

Gets the minimum display temperature.

Specified by:

getMinimumTemperature in class AerologicalCoordinateSystem

Returns:

The minimum display temperature.

getMaximumTemperature

public Real getMaximumTemperature()

Gets the maximum display temperature.

Specified by:

getMaximumTemperature in class AerologicalCoordinateSystem

Returns:

The maximum display temperature.

getIsothermTangent

public Real getIsothermTangent()

Gets the tangent of the isotherms.

Returns:

The tangent of the isotherms.

getTemperaturePerLogPressure

public Real getTemperaturePerLogPressure()

Gets the change in temperature per natural logarithm of pressure in the vertical. The greater this value, the closer together the isotherms are on the plot.

Returns:

The change in temperature per natural logarithm of pressure in the vertical.

getMinimumX

public Real getMinimumX()

Gets the minimum X coordinate.

Specified by:

getMinimumX in class AerologicalCoordinateSystem

Returns:

The minimum X coordinate.

getMaximumX

public Real getMaximumX()

Gets the maximum X coordinate.

Specified by:

getMaximumX in class AerologicalCoordinateSystem

Returns:

The maximum X coordinate.

getMinimumY

public Real getMinimumY()

Gets the minimum Y coordinate.

Specified by:

getMinimumY in class AerologicalCoordinateSystem

Returns:

The minimum Y coordinate.

getMaximumY

public Real getMaximumY()

Gets the maximum Y coordinate.

Specified by:

getMaximumY in class AerologicalCoordinateSystem

Returns:

The maximum Y coordinate.

toReference

public double[][] toReference(double[][] coords)

Transforms (pressure,temperature) coordinates to (X,Y) coordinates.

Specified by:

toReference in class CoordinateSystem

Parameters:

coords - Real coordinates: coords[0][i] and coords[1][i] are the pressure and temperature coordinates, respectively, of the ith point. On output, coords[0][i] and coords[1][i] are the corresponding X and Y display coordinates, respectively.

Returns:

Corresponding display coordinates (i.e. coords).

fromReference

public double[][] fromReference(double[][] coords)

Transforms (X,Y) coordinates to (pressure,temperature) coordinates.

Specified by:

fromReference in class CoordinateSystem

Parameters:

coords - Display coordinates: coords[0][i] and coords[1][i] are the X and Y display coordinates, respectively, of the ith point. On output, coords[0][i] and coords[1][i] are the corresponding pressure and temperature coordinates, respectively.

Returns:

Corresponding real coordinates (i.e. coords).

equals

public boolean equals(Object obj)

Indicate whether or not this coordinate system is the same as another.

Specified by:

equals in class CoordinateSystem

Parameters:

obj - The object to be compared with this one.

Returns:

true if and only if obj is semantically identical to this object.

hashCode

public int hashCode()

Returns the hash code of this instance.

Overrides:

hashCode in class Object

Returns:

The hash code of this instance.

main

public static void main(String[] args)
                 throws Exception

Tests this class.

Parameters:

args - Execution arguments. Ignored.

Throws:

Exception - if something went wrong.

createDisplayCoordinateSystem

public AerologicalCoordinateSystem createDisplayCoordinateSystem(AerologicalCoordinateSystem acs)
                                                          throws VisADException

Create a 3D display coordinate system from the (possibly) 2D input.

Specified by:

createDisplayCoordinateSystem in class AerologicalCoordinateSystem

Parameters:

acs - SkewTCoordinateSystem to get values from.

Returns:

3D version of (possibly) 2D system.

Throws:

VisADException - problem creating new CoordinateSystem