ucar.unidata.geoloc.projection.sat

Class GEOSTransform

java.lang.Object

ucar.unidata.geoloc.projection.sat.GEOSTransform

public class GEOSTransform
extends java.lang.Object

Geostationary Transform

Since:

08/28/2014

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	GEOS
static java.lang.String	GOES
ucar.unidata.geoloc.projection.sat.GEOSTransform.Geoid	grs80
static java.lang.String	GRS80
java.lang.String	scan_geom
ucar.unidata.geoloc.projection.sat.GEOSTransform.Geoid	wgs84
static java.lang.String	WGS84

Constructor Summary

Constructors

Constructor and Description
GEOSTransform()
GEOSTransform(double subLonDegrees)
GEOSTransform(double subLonDegrees, double perspective_point_height, double semi_minor_axis, double semi_major_axis, double inverse_flattening, java.lang.String sweep_angle_axis)
GEOSTransform(double subLonDegrees, double perspective_point_height, double semi_minor_axis, double semi_major_axis, java.lang.String sweep_angle_axis)
GEOSTransform(double subLonDegrees, java.lang.String scan_geom)
GEOSTransform(double subLonDegrees, java.lang.String scan_geom, java.lang.String geoidID)

Method Summary

Modifier and Type	Method and Description
int[]	earthToElemLine(double geographic_lon, double geographic_lat, double scale_x, double offset_x, double scale_y, double offset_y) Transform pixel center Earth coordinates (lon,lat) to integer FGF coordinates.
double[]	earthToFGF(double geographic_lon, double geographic_lat, double scale_x, double offset_x, double scale_y, double offset_y) Transform Earth coordinates (lon,lat) to fractional FGF coordinates.
double[]	earthToSat(double geographic_lon, double geographic_lat) Transform geographic Earth coordinates to satellite view angle coordinate system also known as the "intermediate" coordinate system in CGMS Normalized Geostationary Projection.
double[]	elemLineToEarth(int elem, int line, double scale_x, double offset_x, double scale_y, double offset_y) Transform integer FGF coordinates to (longitude, latitude) of pixel center The (i,j) pixel, zero-based, refers to the pixel center.
boolean	equals(java.lang.Object o)
double[]	FGFtoEarth(double fgf_x, double fgf_y, double scale_x, double offset_x, double scale_y, double offset_y) Transform fractional FGF coordinates to (longitude, latitude).
double[]	FGFtoSat(double fgf_x, double fgf_y, double scale_x, double offset_x, double scale_y, double offset_y) Transform fractional FGF coordinates to (lamda, theta) radians.
double[]	GOES_to_GEOS(double lamda_goes, double theta_goes) Transform view angle coordinates in the GOES scan geometry frame to view angle coordinates in the GEOS scan geometry frame.
int	hashCode()
double[]	satToEarth(double x, double y) Transform satellite view angle coordinates, known as the "intermeidate" coordinates in the CGMS Normalized Geostationary Projection, to geographic Earth coordinates.
double[]	SatToFGF(double lamda, double theta, double scale_x, double offset_x, double scale_y, double offset_y) Transform (lamda, theta) in radians to fractional FGF coordinates.
static java.lang.String	scanGeomToSweepAngleAxis(java.lang.String scanGeometry) Find sweep_angle_axis associated with a scan geometry
static java.lang.String	sweepAngleAxisToScanGeom(java.lang.String sweepAngleAxis) Find scan geometry associated with sweep_angle_axis

Methods inherited from class java.lang.Object

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

Field Detail

GOES

public static final java.lang.String GOES

See Also:

Constant Field Values

GEOS

public static final java.lang.String GEOS

See Also:

Constant Field Values

WGS84

public static final java.lang.String WGS84

See Also:

Constant Field Values

GRS80

public static final java.lang.String GRS80

See Also:

Constant Field Values

wgs84

public final ucar.unidata.geoloc.projection.sat.GEOSTransform.Geoid wgs84

grs80

public final ucar.unidata.geoloc.projection.sat.GEOSTransform.Geoid grs80

scan_geom

public java.lang.String scan_geom

Constructor Detail

GEOSTransform

public GEOSTransform()

GEOSTransform

public GEOSTransform(double subLonDegrees)

GEOSTransform

public GEOSTransform(double subLonDegrees,
                     java.lang.String scan_geom)

GEOSTransform

public GEOSTransform(double subLonDegrees,
                     java.lang.String scan_geom,
                     java.lang.String geoidID)

GEOSTransform

public GEOSTransform(double subLonDegrees,
                     double perspective_point_height,
                     double semi_minor_axis,
                     double semi_major_axis,
                     double inverse_flattening,
                     java.lang.String sweep_angle_axis)

GEOSTransform

public GEOSTransform(double subLonDegrees,
                     double perspective_point_height,
                     double semi_minor_axis,
                     double semi_major_axis,
                     java.lang.String sweep_angle_axis)

Method Detail

earthToSat

public double[] earthToSat(double geographic_lon,
                           double geographic_lat)

Transform geographic Earth coordinates to satellite view angle coordinate system also known as the "intermediate" coordinate system in CGMS Normalized Geostationary Projection.

Parameters:

geographic_lon - longitude, units: degrees

geographic_lat - latitude, units: degrees

Returns:

(lamda, theta) units: radian. This is the (x,y) or (East-West, North_South) view angle.

satToEarth

public double[] satToEarth(double x,
                           double y)

Transform satellite view angle coordinates, known as the "intermeidate" coordinates in the CGMS Normalized Geostationary Projection, to geographic Earth coordinates.

Parameters:

x - is lamda (East-West) angle, units: radians

y - is theta (Norht-South) angle, units: radians

Returns:

(Longitude, Latitude), units degrees

GOES_to_GEOS

public double[] GOES_to_GEOS(double lamda_goes,
                             double theta_goes)

Transform view angle coordinates in the GOES scan geometry frame to view angle coordinates in the GEOS scan geometry frame.

FGFtoEarth

public double[] FGFtoEarth(double fgf_x,
                           double fgf_y,
                           double scale_x,
                           double offset_x,
                           double scale_y,
                           double offset_y)

Transform fractional FGF coordinates to (longitude, latitude).

Parameters:

fgf_x - fractional FGF coordinate, zero-based

fgf_y - fractional FGF coordinate, zero-based

scale_x - scaleFactor from the x coordinate variable

offset_x - addOffset from the x coordinate variable

scale_y - scaleFactor from the y coordinate variable

offset_y - addOffset from the y coordinate variable

Returns:

(Longitude, Latitude), units: degrees

FGFtoSat

public double[] FGFtoSat(double fgf_x,
                         double fgf_y,
                         double scale_x,
                         double offset_x,
                         double scale_y,
                         double offset_y)

Transform fractional FGF coordinates to (lamda, theta) radians.

Parameters:

fgf_x - fractional FGF coordinate, zero-based

fgf_y - fractional FGF coordinate, zero-based

scale_x - scaleFactor from the x coordinate variable

offset_x - addOffset from the x coordinate variable

scale_y - scaleFactor from the y coordinate variable

offset_y - addOffset from the y coordinate variable

Returns:

(lamda, theta), units: radians

elemLineToEarth

public double[] elemLineToEarth(int elem,
                                int line,
                                double scale_x,
                                double offset_x,
                                double scale_y,
                                double offset_y)

Transform integer FGF coordinates to (longitude, latitude) of pixel center The (i,j) pixel, zero-based, refers to the pixel center.

Parameters:

scale_x - scaleFactor from the x coordinate variable

offset_x - addOffset from the x coordinate variable

scale_y - scaleFactor from the y coordinate variable

offset_y - addOffset from the y coordinate variable

Returns:

(Longitude, Latitude), units: degrees, of FGF (i,j) pixel center

earthToFGF

public double[] earthToFGF(double geographic_lon,
                           double geographic_lat,
                           double scale_x,
                           double offset_x,
                           double scale_y,
                           double offset_y)

Transform Earth coordinates (lon,lat) to fractional FGF coordinates.

Parameters:

geographic_lon - Longitude, units: degrees

geographic_lat - Latitude, units: degrees

scale_x - scaleFactor from the x coordinate variable

offset_x - addOffset from the x coordinate variable

scale_y - scaleFactor from the y coordinate variable

offset_y - addOffset from the y coordinate variable

Returns:

fractional fgf coordinates

earthToElemLine

public int[] earthToElemLine(double geographic_lon,
                             double geographic_lat,
                             double scale_x,
                             double offset_x,
                             double scale_y,
                             double offset_y)

Transform pixel center Earth coordinates (lon,lat) to integer FGF coordinates.

Parameters:

scale_x - scaleFactor from the x coordinate variable

offset_x - addOffset from the x coordinate variable

scale_y - scaleFactor from the y coordinate variable

offset_y - addOffset from the y coordinate variable

SatToFGF

public double[] SatToFGF(double lamda,
                         double theta,
                         double scale_x,
                         double offset_x,
                         double scale_y,
                         double offset_y)

Transform (lamda, theta) in radians to fractional FGF coordinates.

Parameters:

scale_x - scaleFactor from the x coordinate variable

offset_x - addOffset from the x coordinate variable

scale_y - scaleFactor from the y coordinate variable

offset_y - addOffset from the y coordinate variable

scanGeomToSweepAngleAxis

public static java.lang.String scanGeomToSweepAngleAxis(java.lang.String scanGeometry)

Find sweep_angle_axis associated with a scan geometry

Parameters:

scanGeometry - scanning geometry (GOES or GEOS)

Returns:

sweep_angle_axis (x or y)

sweepAngleAxisToScanGeom

public static java.lang.String sweepAngleAxisToScanGeom(java.lang.String sweepAngleAxis)

Find scan geometry associated with sweep_angle_axis

Parameters:

sweepAngleAxis - sweep_angle_axis (x or y)

Returns:

scan_geom scanning geometry (GOES or GEOS)

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object